Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

The equilibrium constants KP1 and KP2 for the reactions X ⇌2Y and Z ⇌ P + Q, respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total pressure at these equilibria is

  • 1:1

  • 1:36

  • 1:9

  • 1:9

1196 Views

2.

Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below

1 half Cl subscript 2 space left parenthesis straight g right parenthesis space rightwards arrow with 1 half space increment subscript diss straight H to the power of minus on top space Cl space left parenthesis straight g right parenthesis space rightwards arrow with increment subscript eg straight H to the power of minus on top space Cl to the power of minus space left parenthesis straight g right parenthesis space rightwards arrow with increment subscript hyd straight H to the power of minus on top Cl to the power of minus space left parenthesis aq right parenthesis
The energy involved in conversion of 1 half Cl subscript 2 space left parenthesis straight g right parenthesis space to space Cl to the power of minus space left parenthesis straight g right parenthesis

left parenthesis using space the space data comma space increment subscript diss straight H subscript cl subscript 2 end subscript superscript minus space equals space 240 space kJ space mol to the power of minus comma space increment subscript eg space straight H subscript cl superscript minus space equals space minus space 349 space kJ space mol to the power of minus comma space
increment subscript eg space straight H subscript cl superscript minus space equals space minus 381 space kJ space mol to the power of minus right parenthesis

  • 152 kJ mol-

  • -610 kJ mol-

  • -850  kJ mol-

  • -850  kJ mol-

264 Views

3.

For the following three reactions a, b and c, equilibrium constants are given

a. CO (g) + H2O (g) ⇌ CO2 (g)+ H2 (g); K1
b. CH4(g) + H2O (g) ⇌ CO (g) + 3H2 (g); K2
c. CH4(g) + 2H2O (g) ⇌ CO2 (g) + 4H2 (g); K2
Which of the following relations is correct?

  • K1√K2 = K3

  • K2K3 = K1

  • K3 = K1K2

  • K3 = K1K2

188 Views

4.

Standard entropy of X2, Y2 and XY3 are 60, 40 and 50 JK−1
mol −1, respectively. For the reaction,1/2X2 + 3/2Y2, ΔH = -30 kJ,to be at equilibrium, the temperature will be

  • 1250 K

  • 500 K 

  • 750 K

  • 750 K

392 Views

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5.

Four species are listed below
i. HCO3
ii. H3O+
iii. HSO4
iv. HSO3F
Which one of the following is the correct sequence of their acid strength?

  •  iv < ii < iii < i

  • ii < iii < i < iv

  • i < iii < ii < iv

  • i < iii < ii < iv

442 Views

6.

Which one of the following constitutes a group of the isoelectronic species?

  • straight C subscript 2 superscript 2 minus end superscript comma space straight O subscript 2 superscript minus comma space CO comma space NO
  • NO to the power of plus comma space straight C subscript 2 superscript 2 minus end superscript comma CN to the power of minus comma space straight N subscript 2
  • CN to the power of minus comma space straight N subscript 2 comma space straight O subscript 2 superscript 2 minus end superscript comma space straight C subscript 2 superscript 2 minus end superscript
  • CN to the power of minus comma space straight N subscript 2 comma space straight O subscript 2 superscript 2 minus end superscript comma space straight C subscript 2 superscript 2 minus end superscript
192 Views

7.

Which one of the following pairs of species has the same bond order?

  • CN and NO+

  • CN and CN+

  • O2 and CN

  • O2 and CN

179 Views

8.

The ionization enthalpy of a hydrogen atom is 1.312 × 106Jmol−1. The energy required to excite the electron in the atom from n = 1 to n = 2 is 

  • 8.51 × 105 Jmol−1

  • 6.56 × 105 Jmol−1

  • 7.56 × 105 Jmol−1

  • 7.56 × 105 Jmol−1

385 Views

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9.

The pKa of a weak acid, HA, is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be 

  • 9.58

  • 4.79

  • 7.01

  • 7.01

312 Views

10.

Identify the wrong statements in the following:

  • Chlorofluorocarbons are responsible for ozone layer depletion

  • Greenhouse effect is responsible for global warming

  • Ozone layer does not permit infrared radiation from the sun to reach the earth

  • Ozone layer does not permit infrared radiation from the sun to reach the earth

233 Views

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