List of top Chemistry Questions on Solutions asked in AP ECET EIE

With which of the following anions, $Mg^{2+}$ and $Ca^{2+}$ ions form salts responsible for permanent hardness of water?

Exhausted permutit is regenerated by washing with

$27.2$ mg of $CaSO_4$ and $2.4$ mg of $MgSO_4$ are present in a $2$ kg water sample. What is the total hardness of water (in ppm) in terms of equivalents of $CaCO_3$? (molecular weight of $CaSO_4 = 136$ & molecular weight of $MgSO_4 = 120$)

How many grams of $NaOH$ is required to prepare $5.0$ litre of $0.1\text{ N}$ solution? (Given: At. wt: $H=1$, $O=16$, $Na=23$)

A gaseous mixture contains $8\text{ g}$ of oxygen, $14\text{ g}$ of nitrogen and $8\text{ g}$ of hydrogen. Total number of molecules present in the gaseous mixture is (Given: At. wt: $H=1$, $N=14$, $O=16$, $N_A = 6 \times 10^{23} \text{ mol}^{-1}$)

The equivalent weight of which of the following is the highest?