Forty millilitre of CO was mixed 100 mL of O2 and the mixture was

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

291.

A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20°C are 440 mm of Hg for pentane and 120 mm of Hg for hexane. The mole fraction of pentane in the vapour phase would be

  • 0.549

  • 0.200

  • 0. 786

  • 0.478


292.

If for a sucrose solution, elevation in boiling point is 0.1°C, then what will be the boiling point of NaCl solution for same molal concentration ?

  • 0.1°C

  • 0.2°C

  • 0.08°C

  • 0.01°C


293.

The vapour pressure of pure water is 25.0 mm Hg and that of an aqueous dilute solution of urea in 20mm Hg at 25°C. The molarity of the solution is:

  • 12.6

  • 14.9

  • 13.8

  • 9.6


294.

The significant figures in 1.0024, 1.240 and 0.0020 are respectively

  • 5, 4, 2

  • 3, 3, 1

  • 5, 3, 4

  • 5, 3, 2


Advertisement
295.

A cylinder of compressed gas contains nitrogen and oxygen in the ratio of 3:1 by mole. The total mass of the gas mixture if the cylinder is known to contain 2.5 x 10g of oxygen will be:

  • 8 x 103 g

  • 9 x 10g

  • 9 x 103 g

  • 8 x 102 g


Advertisement

296.

Forty millilitre of CO was mixed 100 mL of O2 and the mixture was exploded. On cooling, the reaction mixture was shaken with KOH. What volume of gas is left?

  • 80 ml of O2

  • 60 ml of O2

  • 80 ml of CO2

  • 50 ml of CO2


A.

80 ml of O2

CO40ml + 12O220 ml   CO240 ml  KOH absorbed

volume of O2 left = (100-20) = 80 ml


Advertisement
297.

Arrange the following (I to IV) in the order of increasing masses:

I. 0.5 mole of O3

II. 0.5 g atom of oxygen

III. 3.011 x 1023 mlecules of O2

IV. 5.6 l of CO2 at STP

  • II < IV < III < I

  • IV < III < I < II

  • II < I < IV < III

  • I < II < III < IV


298.

75 c.c. of N/5 H2SO4, 10 c.c. of N/2 HCl and 30 c.c. of N/10 HNO3 are mixed together. The strength of the resulting acid mixture is:

  • 0.1N

  • 0.2N

  • 0.3N

  • 0.4N


Advertisement
299.

One mole of FeC2O4 is oxidised by x moles of Cr2O72- in acidic medium , x is:

  • 0.5

  • 1.0

  • 1.5

  • 2.0


300.

One gram of mass is equal to :

  • 9 x 1020 ergs

  • 7 x 1015 ergs

  • 5 x 1010 ergs

  • 3 x 105 ergs


Advertisement