General Science Chemistry MCQ-9

Consider the following statements
1 . In Modern Periodic Table, the number of periods is
2 . In Modern Periodic Table, the number of groups is
3 . The long form of Periodic Table was developed by Range and Werner.
Which of the following is/are correct?

(A) Only 1
(B) 2 and 3
(C) 1 and 2
(D) 1, 2 and 3

Consider the following statements about d – block elements
1 . They are all metals.
2 . All of them are not coloured.

3 . They show variable valency.
4 . Most of them form simple salts.
Which of the statements given above are correct?

(A) 1 and 2
(B) 1, 2 and 3
(C) 2 and 3
(D) 3 and 4

Match Column I with Column II .
Column I- Elements)-Column II
(Colour on Flame)
A . Barium 1 . Yellow

B . Sodium 2 . Greenish
C . Silver 3 . Turns black
D . Lead 4 . Apple green

(A) 1 3 4 2
(B) 4 1 3 2
(C) 3 2 4 1
(D) 2 4 1 3

Lead pencil contains

(A) graphite
(B) softened lead
(C) galena
(D) anglesite

Sacrificial anode protects iron or ships, underground pipelines etc., from rusting, a process known as cathodic protection. Which one of the following metals cannot be used as a sacrificial anode?

(A) Tin
(B) Zinc
(C) Magnesium
(D) Aluminium

Consider the following statements with reference to the Periodic Table of chemical element
1 . lionization potential gradually decreases along a period.
2 . In a group of element, electron affinity decreases as the atomic weight increases.
3 . In a given period, electro negativity decrease as the atomic number increases.
Which of these statement(s) is/are correct?

(A) Only 1
(B) Only 2
(C) 1 and 3
(D) 2 and 3

MatchColumn I and Column II .
Column I- Column II
A . First element produced artificially1 . Liquid NH3
B . Chemical used for cooling in refrigerator 2 . Technetium
C . Laughing gas 3 . Aluminium
D . Most abundant metal in the earth’s crust 4 . Nitrous oxide

(A) 1 4 3 2
(B) 2 1 4 3
(C) 4 3 2 1
(D) 3 2 1 4

Which one of the following is the softest?

(A) Sodium
(B) Aluminium
(C) Iron
(D) Copper

Which ore contains both iron and copper?

(A) Cuprite
(B) Chalcocite
(C) Chalcopyrite
(D) Malachite

Assertion (A) Lyophobic colloids get coagulated in the presence of strong electrolytes.
Reason (R) Electrolytes help the coagulation of lyophobic colloids by removing solvent sheaths around them.

(A) Both A and R are individually true and R is the correct explanation of A.
(B) Both A and R are individually true, but R is riot the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.

Which one of the following is not a periodic property i.e., does not show any trend on moving from one side to the other in the Periodic Table?

(A) Atomic size
(B) Valency
(C) Radioactivity
(D) Electro negativity

Which one of the following metals occurs in nature in free state?

(A) Gold
(B) Sodium
(C) Aluminium
(D) Copper

Which among the following elements (metals) pollutes the air of a city having large number of automobiles?

(A) Cadmium
(B) Lead
(C) Chromium
(D) Nickel

In electro-refining of copper, some gold is deposited as

(A) cathode
(B) electrode
(C) cathode mud
(D) anode mud

The depolarization in a primary cell is used for the purpose of

(A) increasing the life of the cell
(B) increasing the emf of the cell
(C) removing the hydrogen collected at one of the plates
(D) removing the dipoles from the electrolytes

Match Column I with Column II
Column I Column II
A . Lightest metal 1 . K + v
B . Non-stoichiometric compound 2 . Li
C . Most water soluble Hydroxide 3 . Fe3O4
D . Element with zero electron affinity 4 . Ne

(A) 2 3 1 4
(B) 3 1 4 2
(C) 1 4 3 2
(D) 4 2 1 3

Which is the purest form of iron?

(A) Pig
(B) Cast iron
(C) Wrought iron
(D) Steel