{"id":247949,"date":"2026-07-24T10:19:19","date_gmt":"2026-07-24T04:49:19","guid":{"rendered":"https:\/\/www.oliveboard.in\/blog\/?p=247949"},"modified":"2026-07-24T10:19:21","modified_gmt":"2026-07-24T04:49:21","slug":"1000-chemistry-questions","status":"publish","type":"post","link":"https:\/\/www.oliveboard.in\/blog\/1000-chemistry-questions\/","title":{"rendered":"1000 Chemistry Questions PDF for SSC &amp; Railway Exams, Download PDF"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_77 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of content<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.oliveboard.in\/blog\/1000-chemistry-questions\/#Download_1000_Chemistry_Questions_PDF\" >Download 1000 Chemistry Questions PDF<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.oliveboard.in\/blog\/1000-chemistry-questions\/#Practice_Chemistry_Questions_Live\" >Practice Chemistry Questions Live<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.oliveboard.in\/blog\/1000-chemistry-questions\/#Sign_Up\" >Sign Up<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.oliveboard.in\/blog\/1000-chemistry-questions\/#Login\" >Login<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.oliveboard.in\/blog\/1000-chemistry-questions\/#Forgot_Password\" >Forgot Password<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.oliveboard.in\/blog\/1000-chemistry-questions\/#i\" >&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.oliveboard.in\/blog\/1000-chemistry-questions\/#Sign_Up-2\" >Sign Up<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.oliveboard.in\/blog\/1000-chemistry-questions\/#Login-2\" >Login<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.oliveboard.in\/blog\/1000-chemistry-questions\/#Forgot_Password-2\" >Forgot Password<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.oliveboard.in\/blog\/1000-chemistry-questions\/#i-2\" >&nbsp;<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>Questions related to Chemistry are asked in SSC CGL, SSC CHSL, SSC MTS, SSC GD, SSC CPO, SSC Selection Post, RRB NTPC, RRB Group D, RRB ALP, RRB Technician, and other government examinations. To score well in Chemistry, candidates must understand important concepts and practise questions regularly. To strengthen candidates\u2019 preparation, a 1000 Chemistry Questions PDF in Hindi has been provided, containing important questions based on the SSC and Railway exam level. The PDF covers major topics such as atomic structure, elements and compounds, the periodic table, chemical bonding, chemical reactions, acids, bases and salts, metals and non-metals, carbon and its compounds, mixtures, solutions, gases, fuels, environmental chemistry, and chemistry in everyday life.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-download-1000-chemistry-questions-pdf\"><span class=\"ez-toc-section\" id=\"Download_1000_Chemistry_Questions_PDF\"><\/span>Download 1000 Chemistry Questions PDF<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>To strengthen their preparation for the General Science section of SSC and Railway examinations, candidates can download the 1000 Chemistry Questions PDF from the link given below. By practicing the questions included in this PDF, candidates can revise important Chemistry topics effectively.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.oliveboard.in\/1000-chemistry-questions-pdf\/?ref=contmk-chemistryenglish\" target=\"_blank\" rel=\"noreferrer noopener\">Download PDF<\/a><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-practice-chemistry-questions-live\"><span class=\"ez-toc-section\" id=\"Practice_Chemistry_Questions_Live\"><\/span>Practice Chemistry Questions Live<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Candidates preparing for SSC and Railway examinations can also practise Chemistry questions live along with downloading the 1000 Chemistry Questions PDF in Hindi. Through live practice, candidates can solve important questions instantly and evaluate their preparation level, speed, and accuracy.<\/p>\n\n\n\n<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n<meta charset=\"UTF-8\">\n<link rel=\"stylesheet\" href=\"https:\/\/courses.oliveboard.in\/edge\/css\/login-modal-for-blog.css\">\n\n<style>\n#quiz-1-sticky-header {\n  position: sticky;\n  top: 0;\n  z-index: 100;\n  background: #1565c0;\n  color: #fff;\n  padding: 12px 20px;\n  border-radius: 10px 10px 0 0;\n  display: flex;\n  justify-content: space-between;\n  align-items: center;\n  font-size: 16px;\n  font-weight: bold;\n  box-shadow: 0 2px 8px rgba(0,0,0,0.2);\n  margin: -20px -20px 20px -20px;\n}\n\n#quiz-1-score-badge {\n  background: rgba(255,255,255,0.2);\n  padding: 4px 12px;\n  border-radius: 20px;\n  font-size: 15px;\n  white-space: nowrap;\n}\n#quiz-1 * { box-sizing: border-box; }\n\n#quiz-1 .quiz-container {\n  max-width: 700px;\n  margin: auto;\n  padding: 20px;\n  background: #fff;\n  border-radius: 14px;\n  box-shadow: 0 6px 16px rgba(0,0,0,0.12);\n}\n\n#quiz-1 h2 {\n  text-align: center;\n}\n\n#quiz-1 .question {\n  margin-bottom: 22px;\n}\n\n#quiz-1 .question p {\n  font-weight: bold;\n}\n\n#quiz-1 button {\n  width: 100%;\n  padding: 12px;\n  margin: 6px 0;\n  border: none;\n  border-radius: 6px;\n  background: #e0e0e0;\n  color: #000;\n  font-size: 16px;\n  cursor: pointer;\n}\n\n#quiz-1 button:hover {\n  background: #d5d5d5;\n}\n\n#quiz-1 button.correct {\n  background: #4caf50;\n  color: #000;\n}\n\n#quiz-1 button.wrong {\n  background: #f44336;\n  color: #000;\n}\n\n#quiz-1 button.locked {\n  pointer-events: none;\n}\n\n\/* SUMMARY *\/\n#quiz-1 .final-summary {\n  margin-top: 40px;\n  padding: 20px;\n  border-radius: 14px;\n  background: #fafafa;\n  border: 2px solid #4caf50;\n}\n\n#quiz-1 .final-summary h3 {\n  text-align: center;\n  margin-bottom: 20px;\n}\n\n#quiz-1 .summary-row {\n  display: grid;\n  grid-template-columns: 120px 1fr 40px;\n  gap: 10px;\n  align-items: center;\n  margin-bottom: 12px;\n  font-weight: bold;\n}\n\n#quiz-1 .summary-bar {\n  height: 14px;\n  background: #ddd;\n  border-radius: 10px;\n  overflow: hidden;\n}\n\n#quiz-1 .bar-fill {\n  height: 100%;\n  width: 0%;\n}\n\n#quiz-1 .bar-attempted { background: #2196f3; }\n#quiz-1 .bar-correct { background: #4caf50; }\n#quiz-1 .bar-wrong { background: #f44336; }\n#quiz-1 .bar-unattempted { background: #9e9e9e; width: 100%; }\n\n#quiz-1 .final-score {\n  text-align: center;\n  font-size: 22px;\n  margin-top: 20px;\n}\n\n#quiz-1 .score-value {\n  font-size: 30px;\n  margin-left: 8px;\n}\n<\/style>\n<\/head>\n\n<body>\n<div id=\"quiz-1\">\n  <div class=\"quiz-container\">\n<div id=\"quiz-1-sticky-header\">\n  <span> Practice Chemistry Questions Live<\/span>\n  <span id=\"quiz-1-score-badge\">Score: <strong id=\"quiz-1-score-value\">0.00<\/strong><\/span>\n<\/div>\n\n    <!-- QUESTIONS -->\n\n&#8220;`html\n<div class=\"question\" data-answered=\"false\">\n  <p>1. The best electrical conductor among common metals is correctly associated with:<\/p>\n  <button data-correct=\"false\">A) Carbon dioxide<\/button>\n  <button data-correct=\"false\">B) Mercury<\/button>\n  <button data-correct=\"true\">C) Silver<\/button>\n  <button data-correct=\"false\">D) Oxygen as the most abundant element<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>2. What is the chemical formula of ammonium chloride?<\/p>\n  <button data-correct=\"true\">A) NH<sub>4<\/sub>Cl<\/button>\n  <button data-correct=\"false\">B) Na<sub>2<\/sub>CO<sub>3<\/sub><\/button>\n  <button data-correct=\"false\">C) CaCl<sub>2<\/sub><\/button>\n  <button data-correct=\"false\">D) MgCl<sub>2<\/sub><\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>3. What is the chemical formula of methanol?<\/p>\n  <button data-correct=\"true\">A) CH<sub>3<\/sub>OH<\/button>\n  <button data-correct=\"false\">B) C<sub>2<\/sub>H<sub>2<\/sub><\/button>\n  <button data-correct=\"false\">C) C<sub>2<\/sub>H<sub>5<\/sub>OH<\/button>\n  <button data-correct=\"false\">D) C<sub>2<\/sub>H<sub>4<\/sub><\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>4. Which element has the chemical symbol Sn?<\/p>\n  <button data-correct=\"true\">A) Tin<\/button>\n  <button data-correct=\"false\">B) Silver<\/button>\n  <button data-correct=\"false\">C) Iodine<\/button>\n  <button data-correct=\"false\">D) Bromine<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>5. Which gases are mainly responsible for the formation of acid rain?<\/p>\n  <button data-correct=\"false\">A) Gamma radiation<\/button>\n  <button data-correct=\"false\">B) Carbon-14<\/button>\n  <button data-correct=\"true\">C) Sulfur dioxide and nitrogen oxides<\/button>\n  <button data-correct=\"false\">D) Radon<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>6. The Castner-Kellner process is used for:<\/p>\n  <button data-correct=\"false\">A) Industrial manufacture of sulfuric acid<\/button>\n  <button data-correct=\"false\">B) Formation of soap from fats and alkali<\/button>\n  <button data-correct=\"true\">C) Manufacture of sodium hydroxide by electrolysis of brine<\/button>\n  <button data-correct=\"false\">D) Industrial production of hydrogen from water gas<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>7. Which compound has the chemical formula Hg<sub>2<\/sub>Cl<sub>2<\/sub>?<\/p>\n  <button data-correct=\"false\">A) Aluminium chloride<\/button>\n  <button data-correct=\"false\">B) Mercuric chloride<\/button>\n  <button data-correct=\"false\">C) Sodium iodide<\/button>\n  <button data-correct=\"true\">D) Calomel<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>8. Who is associated with the inverse relationship between the pressure and volume of a gas at constant temperature?<\/p>\n  <button data-correct=\"true\">A) Robert Boyle<\/button>\n  <button data-correct=\"false\">B) Gilbert N. Lewis<\/button>\n  <button data-correct=\"false\">C) Henry Moseley<\/button>\n  <button data-correct=\"false\">D) Ernest Rutherford<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>9. What is the chemical formula of sodium thiosulfate, commonly known as hypo?<\/p>\n  <button data-correct=\"true\">A) Na<sub>2<\/sub>S<sub>2<\/sub>O<sub>3<\/sub>\u00b75H<sub>2<\/sub>O<\/button>\n  <button data-correct=\"false\">B) K<sub>2<\/sub>Cr<sub>2<\/sub>O<sub>7<\/sub><\/button>\n  <button data-correct=\"false\">C) CaOCl<sub>2<\/sub><\/button>\n  <button data-correct=\"false\">D) KMnO<sub>4<\/sub><\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>10. What is the chemical symbol of fluorine?<\/p>\n  <button data-correct=\"false\">A) Ne<\/button>\n  <button data-correct=\"false\">B) N<\/button>\n  <button data-correct=\"false\">C) O<\/button>\n  <button data-correct=\"true\">D) F<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>11. Electrum is mainly composed of:<\/p>\n  <button data-correct=\"true\">A) Gold and silver<\/button>\n  <button data-correct=\"false\">B) Copper, zinc and nickel<\/button>\n  <button data-correct=\"false\">C) Tin, antimony and copper<\/button>\n  <button data-correct=\"false\">D) Aluminium and magnesium<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>12. Which statement is correctly associated with mercury?<\/p>\n  <button data-correct=\"true\">A) It is a metal that is liquid at room temperature<\/button>\n  <button data-correct=\"false\">B) It is the best electrical conductor among common metals<\/button>\n  <button data-correct=\"false\">C) It is the gas consumed during photosynthesis<\/button>\n  <button data-correct=\"false\">D) It is the most abundant element in Earth&#8217;s crust by mass<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>13. What is the chemical formula of potash alum?<\/p>\n  <button data-correct=\"false\">A) Al<sub>2<\/sub>(SO<sub>4<\/sub>)<sub>3<\/sub><\/button>\n  <button data-correct=\"false\">B) MgSO<sub>4<\/sub>\u00b77H<sub>2<\/sub>O<\/button>\n  <button data-correct=\"false\">C) NaNO<sub>3<\/sub><\/button>\n  <button data-correct=\"true\">D) KAl(SO<sub>4<\/sub>)<sub>2<\/sub>\u00b712H<sub>2<\/sub>O<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>14. Temporary hardness of water is caused by:<\/p>\n  <button data-correct=\"false\">A) Manganese dioxide acting as a catalyst<\/button>\n  <button data-correct=\"false\">B) A saturated aqueous solution of calcium hydroxide<\/button>\n  <button data-correct=\"false\">C) Platinum-rhodium gauze<\/button>\n  <button data-correct=\"true\">D) Bicarbonates of calcium and magnesium<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>15. Which element has the chemical symbol F?<\/p>\n  <button data-correct=\"false\">A) Neon<\/button>\n  <button data-correct=\"false\">B) Nitrogen<\/button>\n  <button data-correct=\"true\">C) Fluorine<\/button>\n  <button data-correct=\"false\">D) Oxygen<\/button>\n<\/div>\n\n    <!-- FINAL SUMMARY -->\n    <div class=\"final-summary\">\n      <h3>Quiz Summary <\/h3>\n\n      <div class=\"summary-row\">\n        <span>Attempted<\/span>\n        <div class=\"summary-bar\"><div class=\"bar-fill bar-attempted\" data-summary=\"attempted\"><\/div><\/div>\n        <span data-count=\"attempted\">0<\/span>\n      <\/div>\n\n      <div class=\"summary-row\">\n        <span>Correct<\/span>\n        <div class=\"summary-bar\"><div class=\"bar-fill bar-correct\" data-summary=\"correct\"><\/div><\/div>\n        <span data-count=\"correct\">0<\/span>\n      <\/div>\n\n      <div class=\"summary-row\">\n        <span>Wrong<\/span>\n        <div class=\"summary-bar\"><div class=\"bar-fill bar-wrong\" 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}\n\n#quiz-2 .quiz-container {\n  max-width: 700px;\n  margin: auto;\n  padding: 20px;\n  background: #fff;\n  border-radius: 14px;\n  box-shadow: 0 6px 16px rgba(0,0,0,0.12);\n}\n\n#quiz-2 h2 {\n  text-align: center;\n}\n\n#quiz-2 .question {\n  margin-bottom: 22px;\n}\n\n#quiz-2 .question p {\n  font-weight: bold;\n}\n\n#quiz-2 button {\n  width: 100%;\n  padding: 12px;\n  margin: 6px 0;\n  border: none;\n  border-radius: 6px;\n  background: #e0e0e0;\n  color: #000;\n  font-size: 16px;\n  cursor: pointer;\n}\n\n#quiz-2 button:hover {\n  background: #d5d5d5;\n}\n\n#quiz-2 button.correct {\n  background: #4caf50;\n  color: #000;\n}\n\n#quiz-2 button.wrong {\n  background: #f44336;\n  color: #000;\n}\n\n#quiz-2 button.locked {\n  pointer-events: none;\n}\n\n\/* SUMMARY *\/\n#quiz-2 .final-summary {\n  margin-top: 40px;\n  padding: 20px;\n  border-radius: 14px;\n  background: #fafafa;\n  border: 2px solid #4caf50;\n}\n\n#quiz-2 .final-summary h3 {\n  text-align: center;\n  margin-bottom: 20px;\n}\n\n#quiz-2 .summary-row {\n  display: grid;\n  grid-template-columns: 120px 1fr 40px;\n  gap: 10px;\n  align-items: center;\n  margin-bottom: 12px;\n  font-weight: bold;\n}\n\n#quiz-2 .summary-bar {\n  height: 14px;\n  background: #ddd;\n  border-radius: 10px;\n  overflow: hidden;\n}\n\n#quiz-2 .bar-fill {\n  height: 100%;\n  width: 0%;\n}\n\n#quiz-2 .bar-attempted { background: #2196f3; }\n#quiz-2 .bar-correct { background: #4caf50; }\n#quiz-2 .bar-wrong { background: #f44336; }\n#quiz-2 .bar-unattempted { background: #9e9e9e; width: 100%; }\n\n#quiz-2 .final-score {\n  text-align: center;\n  font-size: 22px;\n  margin-top: 20px;\n}\n\n#quiz-2 .score-value {\n  font-size: 30px;\n  margin-left: 8px;\n}\n<\/style>\n<\/head>\n\n<body>\n<div id=\"quiz-2\">\n  <div class=\"quiz-container\">\n<div id=\"quiz-2-sticky-header\">\n  <span> Practice Chemistry Questions Live<\/span>\n  <span id=\"quiz-2-score-badge\">Score: <strong id=\"quiz-2-score-value\">0.00<\/strong><\/span>\n<\/div>\n\n    <!-- QUESTIONS -->\n\n<div class=\"question\" data-answered=\"false\">\n  <p>16. What is the chemical symbol of potassium?<\/p>\n  <button data-correct=\"true\">A) K<\/button>\n  <button data-correct=\"false\">B) Cl<\/button>\n  <button data-correct=\"false\">C) Ca<\/button>\n  <button data-correct=\"false\">D) Ar<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>17. What is the chemical formula of citric acid?<\/p>\n  <button data-correct=\"false\">A) HCOOH<\/button>\n  <button data-correct=\"false\">B) H<sub>2<\/sub>C<sub>2<\/sub>O<sub>4<\/sub><\/button>\n  <button data-correct=\"false\">C) C<sub>4<\/sub>H<sub>6<\/sub>O<sub>6<\/sub><\/button>\n  <button data-correct=\"true\">D) C<sub>6<\/sub>H<sub>8<\/sub>O<sub>7<\/sub><\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>18. Which common substance is chemically known as calcium hydroxide?<\/p>\n  <button data-correct=\"false\">A) Washing soda<\/button>\n  <button data-correct=\"false\">B) CNG<\/button>\n  <button data-correct=\"true\">C) Slaked lime<\/button>\n  <button data-correct=\"false\">D) Baking soda<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>19. Which compound has the chemical formula AgCl?<\/p>\n  <button data-correct=\"false\">A) Silver bromide<\/button>\n  <button data-correct=\"true\">B) Silver chloride<\/button>\n  <button data-correct=\"false\">C) Iron sulfide<\/button>\n  <button data-correct=\"false\">D) Lead sulfide<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>20. Which of the following is used as a fissile fuel in nuclear reactors?<\/p>\n  <button data-correct=\"true\">A) Uranium-235<\/button>\n  <button data-correct=\"false\">B) Nuclear fission<\/button>\n  <button data-correct=\"false\">C) Cobalt-60<\/button>\n  <button data-correct=\"false\">D) CFCs<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>21. Liquid nitrogen is commonly used for:<\/p>\n  <button data-correct=\"false\">A) Coagulating suspended impurities during water purification<\/button>\n  <button data-correct=\"true\">B) Cryopreservation of biological samples<\/button>\n  <button data-correct=\"false\">C) Manufacturing nitrogenous fertilizers<\/button>\n  <button data-correct=\"false\">D) Manufacturing cement and Plaster of Paris<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>22. Which alloy is mainly composed of nickel and chromium?<\/p>\n  <button data-correct=\"false\">A) Gunmetal<\/button>\n  <button data-correct=\"false\">B) Manganin<\/button>\n  <button data-correct=\"false\">C) Bronze<\/button>\n  <button data-correct=\"true\">D) Nichrome<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>23. What is the chemical formula of nitric acid?<\/p>\n  <button data-correct=\"false\">A) H<sub>2<\/sub>SO<sub>4<\/sub><\/button>\n  <button data-correct=\"false\">B) H<sub>3<\/sub>PO<sub>4<\/sub><\/button>\n  <button data-correct=\"false\">C) HCl<\/button>\n  <button data-correct=\"true\">D) HNO<sub>3<\/sub><\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>24. Which of the following is an important ore of manganese?<\/p>\n  <button data-correct=\"false\">A) Ilmenite<\/button>\n  <button data-correct=\"false\">B) Cinnabar<\/button>\n  <button data-correct=\"true\">C) Pyrolusite<\/button>\n  <button data-correct=\"false\">D) Apatite<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>25. Which compound has the chemical formula KOH?<\/p>\n  <button data-correct=\"false\">A) Sodium hydroxide<\/button>\n  <button data-correct=\"false\">B) Nitrous acid<\/button>\n  <button data-correct=\"false\">C) Calcium hydroxide<\/button>\n  <button data-correct=\"true\">D) Potassium hydroxide<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>26. Which compound has the chemical formula MgCO<sub>3<\/sub>?<\/p>\n  <button data-correct=\"false\">A) Potassium carbonate<\/button>\n  <button data-correct=\"false\">B) Copper carbonate<\/button>\n  <button data-correct=\"false\">C) Calcium carbonate<\/button>\n  <button data-correct=\"true\">D) Magnesium carbonate<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>27. Water gas is a mixture of:<\/p>\n  <button data-correct=\"false\">A) Calcium oxychloride<\/button>\n  <button data-correct=\"false\">B) Methane<\/button>\n  <button data-correct=\"false\">C) Calcium sulfate dihydrate<\/button>\n  <button data-correct=\"true\">D) Carbon monoxide and hydrogen<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>28. Which substance is characteristically associated with cocoa beans?<\/p>\n  <button data-correct=\"false\">A) Oxalic acid<\/button>\n  <button data-correct=\"false\">B) Citric acid<\/button>\n  <button data-correct=\"true\">C) Theobromine<\/button>\n  <button data-correct=\"false\">D) Cellulose<\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>29. What is the chemical formula of sodium nitrate?<\/p>\n  <button data-correct=\"false\">A) KNO<sub>3<\/sub><\/button>\n  <button data-correct=\"false\">B) Al<sub>2<\/sub>(SO<sub>4<\/sub>)<sub>3<\/sub><\/button>\n  <button data-correct=\"false\">C) KAl(SO<sub>4<\/sub>)<sub>2<\/sub>\u00b712H<sub>2<\/sub>O<\/button>\n  <button data-correct=\"true\">D) NaNO<sub>3<\/sub><\/button>\n<\/div>\n\n<div class=\"question\" data-answered=\"false\">\n  <p>30. What is the chemical formula of cryolite?<\/p>\n  <button data-correct=\"false\">A) Na<sub>2<\/sub>B<sub>4<\/sub>O<sub>7<\/sub>\u00b710H<sub>2<\/sub>O<\/button>\n  <button data-correct=\"true\">B) Na<sub>3<\/sub>AlF<sub>6<\/sub><\/button>\n  <button data-correct=\"false\">C) Cu(NO<sub>3<\/sub>)<sub>2<\/sub><\/button>\n  <button data-correct=\"false\">D) Na<sub>2<\/sub>SiO<sub>3<\/sub><\/button>\n<\/div>\n    <!-- FINAL SUMMARY -->\n    <div class=\"final-summary\">\n      <h3>Quiz Summary <\/h3>\n\n      <div class=\"summary-row\">\n        <span>Attempted<\/span>\n        <div class=\"summary-bar\"><div class=\"bar-fill bar-attempted\" data-summary=\"attempted\"><\/div><\/div>\n        <span data-count=\"attempted\">0<\/span>\n      <\/div>\n\n      <div class=\"summary-row\">\n        <span>Correct<\/span>\n        <div class=\"summary-bar\"><div class=\"bar-fill bar-correct\" data-summary=\"correct\"><\/div><\/div>\n        <span data-count=\"correct\">0<\/span>\n      <\/div>\n\n   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