2 moles of N₂O₄ (g) is kept in a closed container at 298 K and under 1 atm pressure. It is heated to 596 K when 20% by mass of N₂O₄ (g) decomposes to NO₂. The resulting pressure is

• 1.2 atm

• 4.8 atm

• 2.8 atm

• 2.4 atm

Which one of the following contains ionic, covalent and coordinate bonds?

• NaCl

• NaCN

• NaNC

• NaOH

A gas expands from a volume of 1m³ to a volume of 2m³ against an external pressure of 10⁵Nm^-2. The work done by the gas will be

• 10² kJ

• 10² J

• 10³ J

• 10⁵ kJ

24.

The mass of a non-volatile solute of molar mass 40 g mol^-1 that should be dissolved in 114 g of octane to lower its vapour pressure by 20% is

• 11.4 gm

• 9.8 gm

• 12.8 gm

• 10 gm

The approximate time duration in hours to electroplate 30 g of calcium from molten calcium chloride using a current of 5 A is [At. mass of Ca = 40]

• 80

• 10

• 16

• 8

The pH of the solution obtained by mixing 100 ml of a solution of pH = 3 with 400 mL of a solution of pH = 4 is

• 7 - log 2.8

• 4 - log 2.8

• 5 - log 2.8

• 3 - log 2.8

The equilibrium constant of the reaction

A (s) + 2B²⁺ (aq) $\rightleftharpoons$ A²⁺ (aq) + 2B (s);

E${}_{\mathrm{cell}}^{°} = 0.0295 \mathrm{V}\hspace{0.17em}\mathrm{is} \left[\frac{2.303 \mathrm{RT}}{\mathrm{F}} = 0.059\right]$

• 2 × 10²

• 3 × 10²

• 2 × 10⁵

• 10

Which one of the following is not true regarding electromeric effect?

• It is a temporary effect

• It operates on multiple bonds

• It requires an attacking reagent

• It results in the appearance of partial charges on the carbon atoms

20 mL of methane is completely burnt using 50 mL of oxygen. The volume of the gas left after cooling to room temperature is

• 40 mL

• 60 mL

• 30 mL

• 80 mL

The reaction between sodium and water can be made less vigorous by

• adding a little alcohol

• amalgamating sodium

• adding a little acetic acid

• lowering the temperature