Questions in chemical-aritmatic

Select	Question
	Which one of the following properties of an element is not variable
	The modern atomic weight scale is based on
	1 amu is equal to
	Sulphur forms the chlorides ${S_2}C{l_2}{\rm{ and }}SC{l_2}$.The equivalent mass of sulphur in $SC{l_2}$is
	The sulphate of a metal M contains 9.87% of M.This sulphate is isomorphous with $ZnS{O_4}.7{H_2}O$.The atomic weight of M is
	When 100 ml of 1$M\,NaOH$solution and 10 ml of 10$N\,{H_2}S{O_4}$solution are mixed together, the resulting solution will be
	In chemical scale, the relative mass of the isotopic mixture of oxygen atoms $({O^{16}},\,{O^{17}},\,{O^{18}})$ is assumed to be equal to
	For preparing 0.1 N solution of a compound from its impure sample of which the percentage purity is known, the weight of the substance required will be
	1 mol of $C{H_4}$contains
	In the reaction $2N{a_2}{S_2}{O_3} + {I_2} \to N{a_2}{S_4}{O_6} + 2NaI$, the equivalent weight of $N{a_2}{S_2}{O_3}$(mol.wt.= M) is equal to