Oxygen and the oxide ion have the

Number of atoms in 558.5 g of Fe is (at . wt = 55.85)

A compound contains 28% nitrogen and 72% of a metal by weight. Three atoms of metal combine with two atoms of nitrogen. If the atomic weight of nitrogen is 14, the atomic weight of the metal is:

In which case the number of molecules of water maximum

If $4.6$ g of formic acid and $9.0$ g of oxalic acid react with concentrated $H_2SO_4$, and the resulting gaseous mixture is passed through $KOH$ pellets, what mass of gas (in grams) will remain at STP?

Oxidation number of carbon in carbon suboxide is :

One mole of $\;{\rm{C}}{{\rm{O}}_2}$ contains:

Which of the following has greatest no. of atoms

The number of molecules present in 1 mL of gas or vapour at STP is:

Equal masses of oxygen and ozone are present in a container at 298 K. The ratio of their partial pressures ($P_{O_2} : P_{O_3}$) is:

$S{O_2}\,\, + \,\,2\,\,{H_2}S\,\, o \,\,3S\,\, + 2\,\,{H_2}O$ 2 mol of ${H_2}S$ and 11.2 L $S{O_2}$ at NTP react to form $imes$ mol at sulphur, then $imes$ is