Volume of CO₂ obtained from complete decomposition of 20 g CaCO₃ at STP is

• 2.24 litre

• 4.48 litre

• 20 litre

• 22.4 litre

Nitrogen (N₂) is in equilibrium state at T = 421K. The value of most probable speed Vmp is:

• 400 m/s

• 421 m/s

• 500 m/s

• 600 m/s

Which of the following, is not a unit of pressure?

• Atmosphere

• Torr

• Pascal

• Newton

0.5 mole of each of H₂ , SO₂ and CH₄ are kept in a container. A hole was made in the container . After 3h , the order of partial pressures in the container will be :

• pSO₂ > pH₂ > pCH₄

• pSO₂ > PCH₄ > pH₂

• pH₂ > pSO₂ > pCH₄

• pH₂ > pCH₄ > pSO₂

An evacuated glass vessel weighs 50 g when empty, 144.0 g when filled with a liquid of density 0.47 g mL^-1 and 50.5 g when filled with an ideal gas at 760 mm Hg and 300 K. The molar mass of the ideal gas is :

[R = 0.0821 L atm K^-1 mol^-1]

• 61.575

• 130.98

• 123.75

• 47.87

206.

The density of a gas A is thrice that of a gas B at the same temperature. The molecular weight of gas B is twice that of A. What will be the ratio of the pressures acting on B and A?

• $\frac{1}{4}$

• $\frac{7}{8}$

• $\frac{2}{5}$

• $\frac{1}{6}$

10 ml of liquid carbon disulphide (specific gravity 2.63) is burnt in oxygen. Find the volume of the resulting gases measured at STP.

• 23.25 L

• 22.26 L

• 23.50 L

• 20.08 L

A 1 L flask contains 32 g O₂ gas at 27C. What mass of O₂ must be released to reduce the pressure in the flask to 12.315 atm?

• 8 g

• 16 g

• 24 g

• 32 g

1 mol of O₂ and x mol of Ne in a 10 L flask at constant temperature exert a pressure of 10 atm. If partial pressure of O₂ is 2 atm , moles of Ne in the mixture is :

• 1

• 2

• 4

• 3

A 25 W bulb emits monochromatic yellow light of wavelength of 0.57 $\mathrm{\mu }$m. Calculate the rate of emission of quanta per second.

• 7.169 x 10¹⁹

• 4.569 x 10¹⁹

• 8.579 x 10¹⁹

• 9.662 x 10¹⁹