(A) Silicon
(B) Phosphorus
(C) Sulfur
(D) Chloride

The answer is (A) Silicon

(A) 7 periods and 18 groups
(B) 8 periods and 7 groups
(C) 7 periods and 7 groups
(D) 8 periods and 8 groups

The answer is (A) 7 periods and 18 groups

(A) Burning of paper
(B) Digestion of food
(C) Conversation of Water into stream
(D) Burning of coal

The answer is (C) Conversation of Water into stream

(A) Le
(B) Pb
(C) Bi
(D) Ld

The answer is (B) Pb

(A) Hg
(B) Ha
(C) Mr
(D) Mc

The answer is (A) Hg

(A) 2
(B) 4
(C) 5
(D) 10

The answer is (B) 4