The neutralization occurs when $10 \, mL$ of $0.1 \, M$ acid $A$ is allowed to react with $30 \, mL$ of $0.05 \, M$ base $M(OH)_2$. The basicity of the acid $A$ is $...$ $[M$ is a metal$]$

$20.0 \ g$ of a magnesium carbonate sample decomposes on heating to give carbon dioxide and $8.0 \ g$ magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? $(At. \ wt. \ of \ Mg = 24)$

$100 \ mL$ of $0.1 \ N$ hypo solution is decolourised by the iodine liberated from the addition of $x \ g$ of crystalline copper sulphate to an excess of $KI$. The value of $x$ is ............. $g$ (molecular weight of $CuSO_4 \cdot 5H_2O$ is $250$).

If a sample of $8.3 \ mL$ of $H_2SO_4$ $(36 \ N)$ is diluted with $991.7 \ mL$ of water,what is the approximate concentration of the resulting solution (in $N$)?

$0.16 \ g$ of a dibasic acid required $25 \ mL$ of decinormal $NaOH$ solution for complete neutralization. The molecular weight of the acid is

What is the weight of oxygen required for the complete combustion of $2.8 \, kg$ of ethylene? (in $kg$)