Question

If a sample of metal weighs $210g$ in air, $180g$ in water and $120g$ in a liquid; then relative density(RD) is :

• A. RD of metal is $3$
• B. RD of metal is $7$
• C. RD of liquid is $7$
• D. RD of liquid is $\left(1/3\right)$

Answer 1

The correct option is B RD of metal is $7$

RD of metal = weight in air/ loss in weight in water

=$\frac{210}{30}$ = 7

RD of liquid = loss in weight in liquid /loss in weight in water

=$\frac{210-120}{210-180}$ = 3

so RD of metal = 7 and that of liquid = 3

so option (B) is correct