JEE Chemistry Solved Question Paper 2016 | Previous Year Papers | Zigya

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

The number of lone pair(s) of electrons on the central atom is [BrF4]-, XeF6 and [SbCl6]3- are, respectively

  • 2, 1 and 1

  • 2, 1 and 0

  • 2, 0 and 1

  • 1, 0 and 0


2.

The lewis acidity of BF3 is less than BCl3 even though fluorine is more electrongative than chlorine. It is due to

  • stronger 1p (B)-3p(Cl) σ- bonding

  • stronger 2p(B) - 3p(Cl) π-bonding

  • stonger 2p(B) - 2p(F)  σ- bonding

  • stronger 2p(B)- 2p(F) π-bonding


3.

If enthaplies of formation for C2H2(g), CO2(g) and H2O(l) at 25°C and 1atm pressure be 52, -394 and -286kJ mol-1 respectively, then the enthaply of combustion of C2H4(g) will be

  • -141.2 kJ mol-1

  • -1412 kJ mol-1

  • + 141.2 kJ mol-1

  • + 1412 kJ mol-1


4.

8.50g of NH3 is present in 250ml volume. Its active mass is

  • 1.5 ML-1

  • 2.0 ML-1

  • 1.0 ML-1

  • 0.5 ML-1


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5.

The equilibrium constants of the reactions

SO2(g) + 12O2(g)  SO3(g) and 2SO2(g) + O2(g)  2SO3(g) are K1 respectively. The relationship between K1 and K2 will be

  • K12=K2

  • K2 = √K1

  • K1= K2

  • K23 = K1


6.

The geometry around the central atom in ClF4+ is

  • octahedral

  • trigonal bipyramidal

  • square planar

  • square pyramidal


7.

Among the following, the equilibrium which is not affected by an increase in pressure is

  • C(s) + H2O (g)  CO(g) + H2(g)

  • 3Fe(s) + 4H2O (g) Fe3O4 (s) + 4H2(g)

  • 2SO3(g) 2SO2(g) + O2 (g)

  • H2 (g) + I2(s) 2Hi(g) 


8.

Which one of the following is not a unit of energy?

  • lit-atm

  • Kg m2s-2

  • Nm

  • kg ms-2


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9.

When a liquid that is immiscible with water was steam distilled at 95.2°C at a total pressure of 99.652 kPa. The distillate contained 1.27 g of the liquid per gram of water. What will be the molar mass of the liquid if the vapour pressure of water is 85.140 kPa at 95.2°C?

  • 99.65 g mol-1

  • 18 g mol-1

  • 134.1 g mol-1

  • 105.74 g mol-1


10.

What is pH of 2 x 10-8 molar HCl solution? Here, log 2 = 0.301 and log 3 = 0.477.

  • 6.92

  • 9.5

  • 5.4

  • 7.7


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