Daily Chemistry Quiz for Police SI : 28/03/2019

1) Consider the following statements:

Assertion (A): Silver article on exposure to air become black

Reason (R):Silver is oxidized to silver oxide

Now select your answer according to the coding scheme given below:

a)both (a) and (r) are true and (r) is the correct explanation of (a)

b)both (a) and (r) are true and (r) is not the correct explanation of (a)

c)(a) is true, but (r) is false

*d)(A) is false, but (R) is true

2) The most acidic compound of the following is

a) Methane

b) Methyl alcohol

c) Ethyl alcohol

*d) Phenol

3) Consider the following statements:

Assertion (A):Bakelite is a thermosetting plastic

Reason (R): Thermosetting plastics are those which change irreversibly into hard and rigid

materials on heating)

Of these statements:

*a)both (a) and (r) are true and (r) is the correct explanation of (a)

b)both (a) and (r) are true and (r) is not the correct explanation of (a)

c)(a) is true, but (r) is false

d)(A) is false, but (R) is true

4) Diamond and graphite are

a) Isomers

b) isotopes

*c) Allotropes

d) Polymers

5) Activated charcoal is used to remove colouring matter from impure substances) It works by

a) Oxidation

b) Reduction

*c) adsorption

d) Bleaching

6) Bordeaux mixture is a mixture of

*a)Copper sulphate and time

b)Bleaching powder and DDT

c)DDT and BHC

d)DDT and Parathion

7) Aluminium ore is known as

a) Lignite

*b) Bauxite

c) Anthracite

d) Pyrite

8) Consider the following statements:

I.Graphite is an allotrope of carbon

II.Diamond is a metal

III.Graphite is a non- conductor of electricity

IV.Diamond is the hardest naturally occurring substance

Of the Statements:

*a)(I) and (IV) are correct

b)(I) alone is correct

c)(I),(II) and (III) are correct

d)All are correct

9) Which one of the following is correctly matched?

a)Iron - Bones

*b)Cobalt - Vitamin B12

c)Calcium - Semiconductor

d)Silicon - Haemoglobin

10) Match List I and List II correctly and select your answer using the codes given below:

List –I List –II

A)Blood clotting 1) Insulin

B)Blood sugar level 2) Vitamin K

C)Source of energy 3)Carbohydrates

D)Vinegar 4) Acetic acid

Codes:

*a) 2 1 3 4

b)1 2 3 4

c)4 1 3 2

d)3 4 2 1