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 of the following is the number of water molecules maximum?

Upon treating a mixture of $0.46$ g of formic acid and $0.9$ g of oxalic acid with concentrated $H_2SO_4$, a gaseous mixture is evolved. This mixture is then passed through pellets of $KOH$. Determine the mass (in g) of the remaining product at STP.

A gaseous mixture contains oxygen and nitrogen in the ratio of $1:4$ by weight. Therefore, the ratio of their number of molecules is:

Oxidation number of carbon in carbon suboxide is :

13.5 g aluminium changes to ${\rm{A}}{{\rm{l}}^{3 + }}ion$ in solution by losing :

Weight of $112\,\,mL$ of oxygen at NTP on liquification would be:

$26\,{\rm{mL}}$ of ${\rm{C}}{{\rm{O}}_2}$ are passed over hot coke. The maximum volume of CO formed is :

Arrange the following in increasing order of the number of atoms present:

(i) 2 g of He

(ii) 4 g of $H_2$

(iii) 8 g of $O_2$

Elements A and B form two compounds $A_2B$ and $A_3B_2$. 0.2 moles of $A_2B$ weighs 20 g, and 0.1 moles of $A_3B_2$ weighs 18 g. Find the atomic weights of A and B.

Maximum no. of atoms are present in