Chemistry MCQ’s Quiz Questions for Competitive Exams with Answers VOL 4

Chemistry MCQ’s Quiz Questions for NTS, PPSC, CSS, FPSC, PMS, OTS, PTS Tests and Interviews. MCQs are taken from Caravan Comprehensive book. These Multiple Choice Questions of Chemistry are posted here for preparation of Job tests and Entry tests like MCAT and ECAT etc.

1. The rate of chemical reaction depends on the nature of chemical reactants, because?

(a) Energy of activation differs from one reactant to another
(b) Some of the reactants are solid at room temperature
(c) Some of the reactants are coloured
(d) All are correct

2. A closed flask contains water in all its three states, solids liquid and vapor at 0°C. In this situation the average K.E of the water molecule will be?

(a) Maximum in vapor state
(b) Maximum in solid state
(c) Greater in the liquid than in vapor state
(d) Same in all the three states

3. The reaction taking place at anode and cathode are respectively?

(a) Oxidation, reduction
(b) Reduction, oxidation
(c) Reduction, hydrolysis
(d) Oxidation, hydrolysis

4. During electrolysis, metals are deposited at the cathode, because the cathode?

(a) Supplies electrons
(b) Withdraw electrons
(c) Undergoes oxidation
(d) None is correct

5. With the rise in temperature conductivity of metals?

(a) Decreases
(b) Increases
(c) Remains unchanged
(d) May decrease or increase

6. Heavy water is known as heavy because it?

(a) is denser than ordinary water
(b) Is an oxide of deuterium
(c) Has a heavy or bad tastes
(d) Has a beaver isotope of hydrogen

7. On descending a group in a periodic table electropositive character of elements?

(a) Increases
(b) Decreases
(c) Remains same
(d) None

8. In the periodic table on moving from left to right across a period, the metallic character of an element?

(a) Increases
(b) Decreases
(c) Increases and then decreases
(d) Remains constant

9. Mendeleev’s periodic table is upset by the fact that?

(a) Noble gases do not form compounds
(b) Atomic weight of elements are not always whole numbers
(c) Many elements have several isotopes
(d) Some groups stand divided into two subgroups A and B

10. Most of the known elements are?

(a) Metals
(b) Non-metals
(c) Transition metals
(d) Inner transition metals

11. Stainless steel does not rust because?

(a) Nickel present in it does not rust
(b) Iron forms a hard chemical compound with chromium present in it
(c) Chromium and nickel combine with iron
(d) Chromium forms an oxide layer that protects iron from rusting

12. The engines of the rocket that helped the Apollo ll spacecraft to land on the moon used for rocket fuel power?

(a) 0₂
(b) H₂
(c) Propane
(d) Hydrazine

13. Many people died in London in 1952 as a result of air pollution caused by?

(a) Mist
(b) Fog
(c) Smog
(d) Smoke

14. Fluorocarbons are effective scavenger for ozone due to __________?

(a) Photolytic reaction of 02 producing Cl radicals
(b) Photolytic decomposition of 03 producing 02
(c) Photolytic decomposition of 03 into Cl and 02 check karma hey
(d) Photolytic production of oxides of nitrogen

15. Detergents are better than soaps because?

(a) They wash clothes better
(b) Absorb the hardness of water
(c) They are less affected by hard water
(d) They are less soapy

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