The relation between molecular weight $\left( M \right)$ and vapour density $\left( VD \right)$ is:

0.5 moles of water contains how many molecules?

If 50.0 g of an impure sample of limestone (calcium carbonate) is heated, it decomposes to produce 14.0 g of calcium oxide and carbon dioxide. Determine the percentage of calcium carbonate in the limestone sample. (Atomic weight: $Ca = 40$)

A mixture of ${\rm{2}}{\rm{.3}}\,\,{\rm{g}}$ formic acid and ${\rm{4}}{\rm{.5}}\,\,{\rm{g}}$ oxalic acid is treated with conc. ${{\rm{H}}_{{\rm{2}}\,}}{\rm{S}}{{\rm{o}}_{\rm{4}}}$ . The evolved gaseous mixture is passed through ${\rm{KOH}}$ pellets weight (in g) of the remaining product at STP will be

Which of the following contains the greatest number of helium atoms?

In which case the number of molecules of water maximum

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 $O_2$

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:

Which has more molecules: 1 mole of glucose or 18 grams of water?

Which of the following has the maximum number of electrons

A mixture of $2.3$ g formic acid and $4.5$ g oxalic acid is treated with conc. $H_2SO_4$. The evolved gaseous mixture is passed through $KOH$ pellets. The weight (in g) of the remaining product at STP will be