Question

Subscripts in the chemical formula $A_2{B}_3$ denotes:

(i) 2 atoms of A combine with 3 atoms of B to form $A_2{B}_3$

(ii) The subscript 2 denotes that valency of A is 2.

• A. is true and B is false.
• B. A is false and B is true.
• C. Both A and B are true
• D. Both A and B are false

Answer 1

The correct option is A

is true and B is false.

The formula $A_2{B}_3$ denotes that 2 atoms of A have combined with 3 atoms of B. The subscripts also represent the valencies of opposite atoms.

The valency of A is 3 and that of B is 2 here in this case. Because when we write the formula we cross multiply the valencies.