Chemistry Mcqs
Chemistry Mcqs for the preparation of NTS, PPSC, SPSC, BPSC, KPSC, FPSC, OTS and other academic entry test and jobs tests.
1. Why is phosphorus kept under water
(a) to make it durable
(b) to make it wet
(c) to save it from catching fire when exposed to dry air
(d) water forms a protective coating on it
2. Coat is formed due to the process of
(a) Evaporation
(b) Centrifugation
(c) Conjugation
(d) Carbonization
3. Which one of the following is the softest
(a) Iron
(b) Lithium
(c) Iron
(d) Sodium
4. Which of the following has the same atomic number and atomic weight
(a) Hydrogen
(b) Helium
(c) Oxygen
(d) Nitrogen
5. The purest form of iron is
(a) Pig iron
(b) Cast iron
(c) Wrought iron
(d) Stainless steel
6. Rusting of iron requires
(a) Oxygen only
(b) Oxygen and Carbon dioxide
(c) Oxygen and water
(d) Carbon dioxide only
7. Which of the following gases is the most toxic
(a) Carbon dioxide
(b) Carbon monoxide
(c) Sulphur dioxide
(d) Acetic acid
8. Uranium eventually decays into a stable isotope of
(a) Lead
(b) Polonium
(c) Thorium
(d) Radium
9. What is the main component of bio gas and natural gas
(a) Ethane
(b) Butane
(c) Propane
(d) Methane
10. Which among the following elements (metals) pollutes the air of a city having large number of automobiles
(a) Cadmium
(b) Chromium
(c) Lead
(d) Nickel
11. Which of the following elements is found in all organic compounds
(a) Calcium
(b) Carbon
(c) Nitrogen
(d) Oxygen
12. Which of the following is the Chemical name of the salt we use in our kitchen
(a) Sodium Chloride
(b) Ammonium Sulphate
(c) Sodium Carbonate
(d) Calcium Chloride
13. Which gas is used for converting vegetable oils into saturated fats
(a) H2
(b) O2
(c) Cl2
(d) SO2
14. Which of the following gases is used in the cigarette lighters
(a) Butane
(b) Methane
(c) Propane
(d) Radon
15. What is the chemical name of bleaching Powder
(a) Calcium carbonate
(b) Calcium hydrochloride
(c) Calcium phosphate
(d) Calcium cyanamide
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