This quiz works best with JavaScript enabled. Home > General Knowledge > Science > Chemistry > Chemistry – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 21 (36 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The single acid which dissolves gold is? A) Nitric acid. B) Hydrochloric acid. C) Selenic acid. D) Aqua regia. Show Answer Correct Answer: D) Aqua regia. 2. Which element in period four is a metalloid? A) Silicon. B) Gallium. C) Arsenic. D) Titanium. Show Answer Correct Answer: C) Arsenic. 3. Energy stored inside chemical bonds is known as. A) Potential Energy. B) Kinetic Energy. C) Mechanical Energy. D) Radiant Energy. Show Answer Correct Answer: A) Potential Energy. 4. The energy that travels in electromagnetic waves is A) Heat energy. B) Electrical energy. C) Radiant energy. D) Nuclear energy. Show Answer Correct Answer: C) Radiant energy. 5. Building blocks of carbohydrates A) Monosaccharides. B) Glycerol and fatty acids. C) Neucleotides. D) Amino acids. Show Answer Correct Answer: A) Monosaccharides. 6. Physical combination of 2 or more substances not chemically combined that can be separated by physical means A) Mixture. B) Compound. C) Molecule. D) Element. Show Answer Correct Answer: A) Mixture. 7. Our rock candy created this formation A) Crumbs. B) Granules. C) Crystals. D) Pebbles. Show Answer Correct Answer: C) Crystals. 8. Covalent compounds A) Conduct electricity. B) Transfer electrons. C) Share electrons. D) Contain a sea of electrons. Show Answer Correct Answer: C) Share electrons. 9. How many PROTONS would a mole of H atoms have? A) 1. B) There is no way to know. C) 2. D) 6.02 x 1023 protons. Show Answer Correct Answer: D) 6.02 x 1023 protons. 10. Which method uses the boiling point differences by gradually heated a mixture? The substance that vaporize the easiest will separate first. A) Distillation. B) Filtration. C) Decantation. D) Mechanical separation. Show Answer Correct Answer: B) Filtration. 11. What is the mass number of an element? A) Protons + electrons. B) Protons-electrons. C) Number of protons. D) Protons + neutrons. Show Answer Correct Answer: D) Protons + neutrons. 12. If Gibbs free energy is greater than 0, what is the possible chemical reaction? A) Neither. B) Spontaneous. C) Nothing will happen. D) Non-Spontaneous. Show Answer Correct Answer: D) Non-Spontaneous. 13. The items amenable to detection by soft x-rays are A) Narcotics. B) Contrabands. C) Lead in bullets. D) Genuine coins from counterfeit coins. Show Answer Correct Answer: D) Genuine coins from counterfeit coins. 14. What is 5.260 x 10 5 expressed in standard notation? A) 526000. B) 0.00005260. C) 526000000. D) 5260. Show Answer Correct Answer: A) 526000. 15. A temperature increase causes the particles ..... A) To slow down. B) In the right order. C) To move faster. D) Collide higher. Show Answer Correct Answer: C) To move faster. 16. In a chemical reaction, activation energy increases the ..... of the reactants. A) Amount of chemical energy. B) Number of particles. C) Temperature. D) None of above. Show Answer Correct Answer: C) Temperature. 17. Measure mainly of the nuclear particles:protons + neutrons A) Subatomic Particles. B) Atomic Mass. C) Gluons. D) Atomic Number. Show Answer Correct Answer: B) Atomic Mass. 18. How many elements are in the following equation:HO2C A) 4. B) 3. C) 1. D) 2. Show Answer Correct Answer: B) 3. 19. The particles that are found in the nucleus of an atom are A) Neutrons and electrons. B) Electrons only. C) Protons and neutrons. D) Protons and electrons. Show Answer Correct Answer: C) Protons and neutrons. 20. Which gas is used in fire extinguishers? A) Carbon dioxide. B) Sulpher dioxide. C) Nitrogen oxide. D) Carbon monoxide. Show Answer Correct Answer: A) Carbon dioxide. 21. The most electropositive elements among the following is A) Cs. B) Br. C) Na. D) Ca. Show Answer Correct Answer: A) Cs. 22. The energy-transfer molecule formed in cell respiration is A) DNA. B) Protein. C) ATP. D) Glucose. Show Answer Correct Answer: C) ATP. 23. Which of the following are the pre-existing nucleons that were produced after the explosion. A) Protons and Neutrons. B) Protons and electrons. C) Neutrons only. D) None of above. Show Answer Correct Answer: A) Protons and Neutrons. 24. All cell membranes are made of A) Amino acids. B) Glucose. C) Phospholipids. D) DNA. Show Answer Correct Answer: C) Phospholipids. 25. The nucleus of an atom contains A) Protons and electrons. B) Protons and neutrons. C) Electrons and neutrons. D) Only neutrons. Show Answer Correct Answer: B) Protons and neutrons. 26. =The National Chemical Laboratory is situated in A) Bangalore. B) Patna. C) Pune. D) New Delhi. Show Answer Correct Answer: C) Pune. 27. The ratio of how much product is produced compared to how much is expected, expressed as a percentage. A) Limiting reactant. B) Excess reactant. C) Percent Yield. D) None of above. Show Answer Correct Answer: C) Percent Yield. 28. What charge do protons have? A) Positive. B) Neutral. C) Negative. D) None of above. Show Answer Correct Answer: A) Positive. 29. Which subatomic particle is neutral? A) Electron. B) Neutron. C) Positron. D) Proton. Show Answer Correct Answer: B) Neutron. 30. Balance the following equationDicarbon dihydride + Oxygen $\rightarrow$ Carbon dioxide + Water A) 2CH4 + 3O2 $\rightarrow$ 2CO2 + 2H2O. B) 2C2H2 + 5O2 $\rightarrow$ 4CO2 + 2H2O. C) C2H2 + 3O2 $\rightarrow$ 2CO2 + 2H2O. D) 2C2H4 + 5O2 $\rightarrow$ 3CO2 + 2H2O. Show Answer Correct Answer: B) 2C2H2 + 5O2 $\rightarrow$ 4CO2 + 2H2O. 31. The human body is made up of several chemical elements; the element present in the highest proportion (65 %) in the body is A) Oxygen. B) Nitrogen. C) Carbon. D) Hydrogen. Show Answer Correct Answer: A) Oxygen. 32. Which of the following represents a chemical change? A) Salt dissolving into water. B) Ice melting into water. C) Rusting iron. D) Shattering glass. Show Answer Correct Answer: C) Rusting iron. 33. A positively or negatively charged particle. A) Compound. B) Chemical bond. C) Covalent bond. D) Ion. Show Answer Correct Answer: D) Ion. 34. Soluble inorganic compounds whose ions conduct a current is solution are called A) Electrolytes. B) Proteins. C) Hydrophobic. D) Deoxyribonucleic acid. Show Answer Correct Answer: A) Electrolytes. 35. Under similar conditions of temperature and pressure equal volume of all gases contain equal number of molecules. This is A) Law of multiple proportion. B) Law of conservation of mass. C) Avogadros law. D) Law of definite proportion. Show Answer Correct Answer: C) Avogadros law. 36. X 1023 atoms of lithium (Li) is equal to how many moles? A) 0.351 moles. B) 0.849 moles. C) 1.18 moles. D) 1.34 moles. Show Answer Correct Answer: B) 0.849 moles. ← PreviousRelated QuizzesScience QuizzesGeneral Knowledge QuizzesChemistry Quiz 1Chemistry Quiz 2Chemistry Quiz 3Chemistry Quiz 4Chemistry Quiz 5Chemistry Quiz 6Chemistry Quiz 7Chemistry Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books