In the complete combustion of $C_4H_{10}$,the number of moles of oxygen required is:

The reaction of $1 \ mol$ of magnesium nitride with excess water gives:

$100 \ mL$ of $PH_3$ on decomposition produces phosphorus and hydrogen. The change in volume is ............... $mL$ increase.

$A$ bottle of cold drink contains $200 \, mL$ of liquid with $0.1 \, M$ $CO_2$. If $CO_2$ behaves ideally,what will be the volume of $CO_2$ gas at $STP$ in the cold drink solution (in $, L$)?

How many grams of $NaOH$ are required to neutralize $12.2 \ g$ of benzoic acid (in $g$)?

The weight of a residue obtained by heating $2.76 \, g$ of silver carbonate is......$g$