List of practice Questions

Match List-I with List-II :

	List-I (Species)		List-II (Maximum allowed concentration in ppm in drinking water)
A	F^-	I	< 50 ppm
B	\(SO^{2-}_4\)	II	< 5 ppm
C	\(NO^-_3\)	III	< 2 ppm
D	Zn	IV	< 500 ppm

Choose the correct answer from the options given below :

Given below are two statements:
Statement I: Permutit process is more efficient compared to the synthetic resin method for the softening of water.
Statement II: Synthetic resin method results in the formation of soluble sodium salts.
In the light of the above statements, choose the most appropriate answer from the options given below:

Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 gof water, it depresses the freezing point by 0.2°C. The percentage association of solute A in water is :

[Given : Molar mass of A = 93 g mol^–1. Molal depression constant of water is 1.86 K kg mol^–1.]

Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to