PG TRB Chemistry Study Materials 2020-2021 - 3

Question: 11

Isotonic solutions have the same

(A) Strength

(B) Normally

(C) Molar concentration

(D) Density

Question: 12

The existence of isotopes was discovered by

(A) Soddy

(B) Chadwick

(C) Rutherford

(D) Neils Bohr

Question: 13

In which of the following silver is not to be present?

(A) Ruby silver

(B) Lunar caustic

(C) German silver

(D) Horn silver

Question: 14

The alkali metals have ___ electrons in the valence shell.

(A) 1

(B) 2

(C) 3

(D) 4

Question: 15

Which period includes actinides?

(A) Fourth

(B) Fifth

(C) Sixth

(D) Seventh