ABC Chemistry Class 12. We covered all the ABC Chemistry Class 12 MCQs in this post for free so that you can practice well for the exam.
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ABC Chemistry Class 12 Objective for Students
The proposition ‘equal volumes of different gases contain equal numbers of molecules at the same temperature and pressure is known as:
(a) Avogadro’s hypothesis.
(b) Gay-Lussac’s hypothesis.
(c) Planck’s hypothesis.
(d) Kirchhoff’s theory.
Option a – Avogadro’s hypothesis
Which one of the following is a chemical change?
(a) Cutting of hair.
(b) Graying of hair naturally.
(c) Swelling of resin in water.
(d) Cutting of fruit.
Option b – Graying of hair naturally
Which one among the following chemicals is used as washing soda?
(a) Calcium carbonate.
(b) Calcium bicarbonate.
(c) Sodium carbonate.
(d) Sodium bicarbonate.
Option c – Sodium carbonate
Why is potassium permanganate used for purifying drinking water?
(a) It kills germs.
(b) It dissolves the impurities.
(c) It is a reducing agent.
(d) It is an oxidizing agent.
Option d – It is an oxidizing agent
The desirable range of pH for drinking water is:
(a) 6.5 to 8.5.
(b) 5.0 to 6.5.
(c) 6.5 to 7.0.
(d) 7.0 to 8.5.
Option c – 6.5 to 7.0
Which gas is known as ‘noble gas’?
(a) Hydrogen.
(b) Oxygen.
(c) Helium.
(d) Carbon dioxide.
Option c – Helium
Which among the following is called ‘Laughing Gas’ popularly?
(a) Nitric oxide.
(b) Nitrous oxide.
(c) Nitrogen penta oxide.
(d) Nitrogen.
Option b – Nitrous oxide
The compound C6H12O4 contains:
(a) 22 atoms per mole.
(b) Twice the mass percent of H as compared to the mass percent of C.
(c) Six times the mass percent of C as compared to the mass percent of H.
(d) Thrice the mass percent of H as compared to the mass percent of O.
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