What is the solubility of a salt if 0.4g of it is obtained on evaporating 200\(cm^{3}\) of its saturated solution to dryness?

A.

0.08\(gdm^{-3}\)

B.

2.00\(gdm^{-3}\)

C.

8.00\(gdm^{-3}\)

D.

80.00\(gdm^{-3}\)

Correct answer is B

1000\(cm^{3}\) = 1\(dm^{3}\)

200\(cm^{3}\) = 0.2\(dm^{3}\)

⇒ 0.2\(dm^{3}\) contains 0.4g

hence, solubility of the salt which is the amount of the salt dissolvable in 1\(dm^{3}\) is

\(\frac{0.4g}{0.2dm^{3}} = 2.0gdm^{-3}\)