Question

If the valency of A is 4 and that of B is 2. What will be the chemical formulae of a compound formed by the combination of A and B?

• A. $A{B}_4$
• B. $A{B}_2$
• C. $AB$
• D. $A_{2}B$

Answer 1

The correct option is B

$A{B}_2$

$\because$ The Valency of A is +4

$\because$ The Valency of B is -2

$A^4{B}^2$

$A_2{B}_4$ [ by criss-cross method]

$\because$ 2 is HCF of 2 and 4

$\therefore$ Chemical Formulae is $A{B}_2$.