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

What is the mass percent of carbon in $C{O_2}$

A mixture of $CaCO_3$ and $MgCO_3$ weighing 1.84 g on heating leaves a residue weighing 0.96 g. If the percentage by mass of $CaCO_3$ in the original mixture is x%, what is the value of x/2?

The number of Na atoms in 46 g ‘Na”

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:

According to the Haber-Bosch process, the molar ratio of hydrogen to ammonia is:

Number of molecules in 1 ml of ${O_2}$ at NTP

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.

0.3 g of an oxalate salt was dissolved in 100 mL solution. The solution required 90 mL of $N/20$ ${\rm{KMn}}{{\rm{O}}_4}$ for complete oxidation. The % of oxalate ion in salt is:

The isoelectronic species among the following are:$I){\rm{CH}}_3^ + ;{\rm{II)NH}}_2^ + ;{\rm{III)NH}}_4^ + ;{\rm{IV)N}}{{\rm{H}}_3}$

Which one of the followings has maximum number of atoms ?