Questions in chemical-aritmatic

Select	Question
	The percentage of nitrogen in urea is about
	If two compounds have the same empirical formula but different molecular formula, they must have
	A compound (80 g) on analysis gave $C = 24 g$, $H = 4 g$, $O = 32 g$. Its empirical formula is
	The empirical formula of a compound is $C{H_2}O.$ 0.0835 moles of the compound contains 1.0 g of hydrogen. Molecular formula of the compound is
	The empirical formula of an acid is $C{H_2}{O_2}$, the probable molecular formula of acid may be
	In which of the following pairs of compounds the ratio of C, H and O is same
	How much of NaOH is required to neutralise 1500 $c{m^3}$of 0.1 $N\,HCl$ (Na = 23)
	How much water should be added to 200 c.c of semi normal solution of $NaOH$to make it exactly deci normal
	2.76 g of silver carbonate on being strongly heated yield a residue weighing
	In the reaction, $4N{H_3}(g) + 5{O_2}(g) \to 4NO(g) + 6{H_2}O(g)$, When 1 mole of ammonia and 1 mole of ${O_2}$are made to react to completion