Which reagent is used to remove $SO_4^{2-}$ and $Cl^{-}$ ions from a solution?

Observe the following reaction: $2A + B \longrightarrow C$. The rate of formation of $C$ is $2.2 \times 10^{-3} \ mol \ L^{-1} \ min^{-1}$. What is the value of $-\frac{d[A]}{dt}$ (in $mol \ L^{-1} \ min^{-1}$)?

The weight in grams of a non-volatile solute (mol. wt. $60$) to be dissolved in $90 \ g$ of water to produce a relative lowering of vapour pressure of $0.02$ is

Which of the following statements is correct?

The solution of the differential equation $x y^2 d y - (x^3 + y^3) d x = 0$ is

Which one of the following gives a sooty flame on combustion?