An artificial radioactive isotope gave 714N after two successive

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

When 50cm3 of 0.2N H2SO4 is mixed with 50 cm3 of 1N KOH, the heat liberated is

  • 11.46 kJ

  • 57.3 kJ

  • 573 kJ

  • 573 J


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2.

An artificial radioactive isotope gave 714N after two successive β-particle emissions. The number of neutrons in the parent nucleus must be

  • 9

  • 14

  • 5

  • 7


A.

9

Atomic number increases by one after the emission of one β-particles. Hence, the parent nucleus ( which on two successive β-emission gave 7N14) must be 5X14. Hence, number of neturons in parents nucleus= 14-5 = 9.


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3.

A solution contains 1.2046 x 1024 hydrochloric acid molecules in one dm3 of the solution. The strength of the solution is

  • 6N

  • 2N

  • 4N

  • 8N


4.

Nuclear theory of the atom was put forward by

  • Rutherford

  • Aston

  • Neils Bohr

  • J.J. Thomson


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5.

The enthalpy of reaction,

H2(g) +12O2(g)  H2O(g) isH1 and that of H2(g) +12O2(g)  H2O(l) isH2.Then

  • ΔH1 < ΔH2

  • ΔH1 + ΔH2 = 0

  • ΔH1 > ΔH2

  • ΔH1 = ΔH2


6.

The pressure and temperature of 4 dm3 of carbon dioxide gas are doubled. Then the volume of carbon dioxide gas would be

  • 2 dm3

  • 3 dm3

  • 4 dm3

  • 8 dm3


7.

4g of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating gave 5 g of its oxide. The equivalent weight of copper is

  • 23

  • 32

  • 12

  • 20


8.

The chemical equilibrium of a reversible reaction is not influenced by

  • pressure

  • catalyst

  • concentration of the reaction

  • temperature


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9.

The number of 2p electrons having spin quantum number s =-1/2 are

  • 6

  • 0

  • 2

  • 3


10.

56g of nitrogen and 8g of hydrogen gas are heated in a closed vessel. At equilibrium 34 g of ammonia are present. The equilibrium number of moles of nitrogen,hydrogen and ammonia respectively are

  • 1,2,2

  • 2,2,1

  • 1,1,2

  • 2,1,2


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