$10 \ cm^{3}$ of $0.1 \ N$ monobasic acid requires $15 \ cm^{3}$ of sodium hydroxide solution whose normality is: (in $N$)

Of all the three common mineral acids,only sulphuric acid is found to be suitable for making the solution acidic in redox titrations involving $KMnO_4$ because:

When potassium permanganate is titrated against ferrous ammonium sulphate,the equivalent weight of potassium permanganate is

The weight of oxalic acid that will be required to prepare a $1000 \ mL$ $(N / 20)$ solution is

The ammonia evolved from $2 \ g$ of a compound in Kjeldahl's estimation of nitrogen neutralises $10 \ mL$ of $2 \ M \ H_2SO_4$ solution. The weight percentage of nitrogen in the compound is

The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins,respectively,are :