Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride. The volume of hydrogen gas produced at STP from the reaction of $11.5 \mathrm{~g}$ of zinc with excess $\mathrm{HCl}$ is __________ L (Nearest integer)

(Given : Molar mass of $\mathrm{Zn}$ is $65.4 \mathrm{~g} \mathrm{~mol}^{-1}$ and Molar volume of at )

The molality of a $10 \%(\mathrm{v} / \mathrm{v})$ solution of di-bromine solution in $\mathrm{CCl}_{4}$ (carbon tetrachloride) is ''. ____________ . (Nearest integer)

On complete combustion, $0.492 \mathrm{~g}$ of an organic compound gave $0.792 \mathrm{~g}$ of $\mathrm{CO}_{2}$. The % of carbon in the organic compound is ___________ (Nearest integer)

1 L aqueous solution of H₂SO₄ contains 0.02 m mol H₂SO₄. 50% of this solution is diluted with deionized water to give 1 L solution (A). In solution (A), 0.01 m mol of H₂SO₄ are added. Total m mols of H₂SO₄ in the final solution is ___________ $\times$ 10³ m mols.

Two elements A and B which form 0.15 moles of A₂B and AB₃ type compounds. If both A₂B and AB₃ weigh equally, then the atomic weight of A is _____________ times of atomic weight of B.

Number of hydrogen atoms per molecule of a hydrocarbon A having 85.8% carbon is __________

(Given : Molar mass of A = 84 g mol$^{-1}$)

Blister copper is produced by reaction of copper oxide with copper sulphide.

2Cu₂O + Cu₂S $\to$ 6Cu + SO₂

When 2.86 $\times$ 10³ g of Cu₂O and 4.77 $\times$ 10 g of CuS are used for reaction, the mass of copper produced is _____________ g. (nearest integer)

A protein 'A' contains 0.30% of glycine (molecular weight 75). The minimum molar mass of the protein 'A' is __________ $\times$ 10³ g mol^$-$1 [nearest integer]

The moles of methane required to produce 81 g of water after complete combustion is _____________ $\times$ 10^$-$2 mol. [nearest integer]

Molality of an aqueous solution of urea is $4.44 \mathrm{~m}$. Mole fraction of urea in solution is $x \times 10^{-3}$, Value of is ________. (Integer answer)