1st Year Chemistry MCQS with Answers Chapter 3

Pressure remaining constant at which temperature the volume of a gas will become twice of what it is at 0° C

273 K

546°C

546 K

200°C

the order of the rate of diffusion of gases NH₃, SO₂, CI₂and CO₂ is

NH₃ > SO₂>CI₂CO₂

NH₃> CO₂> SO₂> CI₂

NH₃> CO₂> CI₂> SO₂

CI₂> SO₂> CO₂> NH₃

Which of the following will have the same number of molecules at STP

28 g of N₂and 5.6 dm³of oxygen

11.2 dm³of O₂and 32 g of O₂

44 g of CO₂and 11.2 dm³of CO

280 cm³of CO₂and 280 cm³of N₂O

Normal temperature and pressure (S.T.P) of gas rafers to

273° C and 76 mm Hg

273 K and 76 mm Hg

273 K and 760 mm Hg

273° C and 760 mm Hg

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will

Reduce to 1/4

Increase four times

Be doubled

Remain unchanged