TRB Old Question Papers for Chemistry - 5

Question: 21

Which among the following is a metalloid?

(A) Arsenic

(B) Iodine

(C) Silver

(D) Tin

Question: 22

Which one is the pure element?

(A) Sodium

(B) Glass

(C) Cement

(D) None of these

Question: 23

Which of the following shows electrical conduction?

(A) Sodium

(B) Potassium

(C) Diamond

(D) Graphite

Question: 24

Isotopes of a given element contain

(A) Different numbers of protons but the same number of neutrons

(B) Different number of both protons and neutrons

(C) The same number of protons and neutrons

(D) The same number of protons but different number of neutrons

Question: 25

The charge of ammonium ion is

(A) +1

(B) -1

(C) +2

(D) -2