Questions and answers for exam Preparation

MCQs

Total Questions : 10

Water softening is the process in which
(a) impurities are removed from water
(b) dissolved calcium ions are removed from hard water
(c) dissolved magnesium ions are removed from hard water
(d) water is boiled for extracting all salts from it

(a) and (b)
(b) and (c)
(a) and (d)
(a), (b) and (d)

Discuss Question

Answer: Option B. -> (b) and (c)
:
B

Option: (b)

Question 2.

Give the increasing order of the atomic masses of the following elements
(a) Hydrogen
(b) Oxygen
(c) Helium
(d) Carbon

(a), (b), (c), (d)
(d), (c), (b), (a)
(b), (c), (a), (d)
(a), (c), (d) ,(b)

Discuss Question

Answer: Option D. -> (a), (c), (d) ,(b)
:
D

Option: (d)

Question 3.

Assertion (A): Phenyl is used as a household germicide.
Reason (R) : Phenyl is phenol derivative and phenol is effective germicide.

Both A and R are true and R is the correct explanation of A
Both A and R are true but R is not the correct explanation of A
A is true but R is false
A is false but R is true

Discuss Question

Answer: Option A. -> Both A and R are true and R is the correct explanation of A
:
A

Option: (a)

Question 4.

Radioactivity is the random spontaneous disintegration of an atom of an element. The stability of the nucleus depends on the relative numbers of protons and neutrons present. Radioactive disintegration is an example of
(a) a first order reaction
(b) a reaction that obeys rate law
(c) a second order reaction

(a) and (b)
(b) only
(c) only
(b) and (c)

Discuss Question

Answer: Option A. -> (a) and (b)
:
A

Option: (a)

Question 5.

In the process of cleaning, soap functions by
(a) changing hard water into soft water
(b) reducing oily and greasy dirt into colloidal particles
(c) converting the dirt to lather and water soluble particles
(d) increasing the cleansing properties of water

(a) and (d)
(b) only
(c) only
(d) only

Discuss Question

Answer: Option B. -> (b) only
:
B

Option: (b)

Question 6.

Assertion (A): Sodium metal is stored under kerosene.
Reason (R) : Metallic sodium melts when exposed to air

Both A and R are true and R is the correct explanation of A
Both A and R are true but R is NOT the correct explanation of A
A is true but R is false
A is false but R is true

Discuss Question

Answer: Option C. -> A is true but R is false
:
C

Option: (c)

Question 7.

Give the chronological order (increasing) of the birth of the following scientists
(a) John Dalton
(b) Linus Pauling
(c) Dmitri Mendeleev
(d) Ptolemy

(a), (c), (b), (d)
(a), (d), (c), (b)
(b), (c), (a), (d)
(b), (d), (c), (a)

Discuss Question

Answer: Option A. -> (a), (c), (b), (d)
:
A

Option: (a)

Question 8.

The noble gases are a group of chemical elements with very similar properties. The six noble gases that occur naturally are helium (He), neon (Ne),argon (Ar), krypton (Kr), xenon (Xe), and the radioactive radon (Rn).The noble gases are:
(a) Mono atomic, colorless and odorless
(b) diatomic, colorless and odorless
(c) have very low chemical reactivity

(a) only
(a) and (c)
(c) only
(b) and (c)

Discuss Question

Answer: Option B. -> (a) and (c)
:
B

Option: (b)

Question 9.

Assertion (A): To dilute sulphuric acid, acid is added to water and not water to acid.
Reason (R): Specific heat of water is quite large.

Both A and R are true and R is the correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true

Discuss Question

Answer: Option A. -> Both A and R are true and R is the correct explanation of A
:
A

Option: (a)

Question 10.

Consider the following statements
Coke is one of the materials of the charge added to blast furnace for the production of steel/iron. Its function is to
(a) act as the reducing agent
(b) remove silica associated with the iron ore
(c) function as fuel, to supply heat
(d) act as an oxidizing agent Of these statements