XI-CHE-QUARTERLY EXAM QUIZ

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature. The volume of gas left after cooling to room temperature is ………..

• 40 ml CO2 gas

• 40 ml CO2 gas and 80 ml H2O gas

• 60 ml CO2 gas and 60 ml H2O gas

• 120 ml CO2 gas

Carbon forms two oxides, namely carbon monoxide and carbon dioxide. The equivalent mass of which element remains constant?

• Carbon

• Oxygen

• Both carbon and oxygen

• Neither carbon nor oxygen

The equivalent mass of a trivalent metal element is 9 g eq-1 the molar mass of its anhydrous oxide is ………..

• 102 g

• 270 g

• 78 g

• 27 g

7.5 g of a gas occupies a volume of 5.6 liters at 0°C and 1 atm pressure. The gas is …………

• NO

• N2O

• CO

• CO2

What is the mass of precipitate formed when 50 ml of 8.5% solution of Ag NO3 is mixed with 100 ml of 1.865% potassium chloride solution?

• 3.59 g

• 14 g

• 28 g

• 7 g

Rate of diffusion of a gas is …………

• inversely proportional to the square root of its molecular weight

• directly proportional to its square root of its molecular weight

• directly proportional to its density

• directly proportional to its molecular weight

When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules …………

• are above inversion temperature

• exert no attractive forces on each other

• do work equal to the loss in kinetic energy

• colide without loss of energy

In a closed room of 1000 m3 a perfume bottle is opened up. The room develops a smell. This is due to which property of gases?

• Viscosity

• Density

• Diffusion

• None

The value of universal gas constant depends upon ………..

• Temperature of the gas

• units of Pressure and volume

• Volume of the gas

• Number of moles of the gas

25 g of each of the following gases are taken at 27°C and 600 mm Hg pressure. Which of these will have the least volume?

• HBr

• HI

• HCl

• HF