A 40 mL of a mixture of H₂ and O₂ was placed in a gas burette at 18 ^oC and  1 atm pressure. A spark was supplied so that the formation of water was complete . The remaining pure gas had a volume of 10 mL at 18 ^oC  and 1 atm pressure. If the remaining gas was H₂ , what was the initial mole percentage of H₂ in the mixture?

1.  25%

2.  50%

3.  35%

4.  75%

60 mL of a mixture of equal volume of Cl₂ and an oxide of chlorine was heated and then cooled back to the original temperature. The resulting gas mixture was found to have volume of 75 ml. On treatment with caustic soda solution, the volume contracted to 15 ml. Assume that all the measurements are made at same T and P. Deduce the simplest formula for oxide of Cl₂. The oxide of Cl₂ on heating decomposes quantitatively to O₂ and Cl₂.

For the reaction, N₂ O₅  (g)→2NO₂ (g) + 0.5 O₂ (g),

Calculate the mole fraction of N₂ O₅ (g) decomposed at a constant volume and temperature if the initial pressure is 600 mm Hg and the pressure at any time is 960 mm Hg.  Assume ideal gas behaviour.

An underwater bubble with radius of  5 cm at the bottom of tank , where the temperature is 5^oC and pressure is 3 atm rises to the surface, where temperature is 25 ^oC and pressure is 1 atm. What will be the radius of bubble when it reaches to the surface?

If density of vapours of a substance of molar mass 18 g/mole at 1 atm pressure and 500 K is

0.36 kg m^–3 , then the value of Z for the vapours is-

(R = 0.082 L atm mole K^–1)

1. $\frac{41}{50}$

2. $\frac{50}{41}$

3. 1.1

4. 0.9

Equal amount (mass) of methane and ethane have their total translational kinetic energy in the ratio

3: 1 then their temperatures are in the ratio.

(1) 5 : 8

(2) 45 : 8

(3) 15 : 8

(4) 8 : 5

The graph that represents an isobar $\left(\frac{\mathrm{nR}}{\mathrm{p}}\mathrm{\hspace{0.17em}}>\mathrm{\hspace{0.17em}1}\right)$ is-

1.  

2. 

3. 

4.  

For a certain gas which deviates a little from ideal behaviour, the values of density, p

were measured at different values of pressure, P. The plot of P/p on the Y–axis versus P on the X–axis was nonlinear and had an intercept on the Y–axis, which was equal to

(1) $\frac{\text{RT}}{\text{M}}$

(2) $\frac{\text{M}}{\text{RT}}$

(3) RT

(4) $\frac{\text{RT}}{\text{V}}$

Where M = molar mass.

A sample of water gas has a composition by volume of 50% H₂, 45% CO and 5% CO₂. Calculate the volume in litre at S.T.P. of water gas which on treatment with excess of stream will produce 5 litre H₂. The equation for the reaction is : CO + H₂O $\stackrel{}{\to }$ CO₂+ H₂

(1) 4.263 Litre

(2) 5.263 Litre

(3) 6.263 Litre

(4) 7.263 Litre

Flask A of volume 10 litre containing 20 gram of H₂ and flask B of volume 10 litre containing 88 gram CO₂ are connected by a connector having negligible volume. When the valve of the connector is opened, the composition of H₂ gas in flask B after opening the valve is-

1. 10%

2. 13%

3. 15%

4. 20%