Equal masses of $H_2, O_2$ and methane have been taken in a container of volume $V$ at temperature $27^{\circ}C$ in identical conditions. The ratio of the volumes of gases $H_2:O_2:$methane would be

When 22.4 L of H$_2 (g)$ is mixed with 11.2 L of Cl$_2 (g),$each at STP, the moles of HCl (g) formed is equal to

1.0 g of magnesium is burnt with 0.56 g O$_2$ in a closed vessel. Which reactant is left in excess and how much? (At. wt. Mg = 24; O = 16)

A mixture of gases contains H$_2$ and O$_2$ gases in the ratio of 1:4 (w/w). What is the molar ratio of the two gases in the mixture?

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. Weight (in g) of the remaining product at STP will be

The number of moles of hydrogen molecules required to produce $20$ moles of ammonia through Haber’s process is:

A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is:

Which one of the following has maximum number of atoms?

Copper crystallizes in an fcc unit cell with a cell edge length of $3.608 \times 10^{-8}$ cm. The density of copper is $8.92$ g cm$^{-3}.$ Calculate the atomic mass of copper.

The right option for the mass of CO$_2$ produced by heating 20 g of 20% pure limestone is (Atomic mass of Ca = 40)$\newline {CaCO}_3 \xrightarrow{1200 K} CaO + CO_2$

Weight (g) of two moles of the organic compound, which is obtained by heating sodium ethanoate with sodium hydroxide in presence of calcium oxide is:

Which one of the following statements is correct?

A compound is formed by two elements A and B. The elements B forms cubic close packed structure and atoms of A occupy 1/3 of tetrahedral voids. If the formula of the compound is A$_xB_y,$ then the value of x + y is: