Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Hardening of oil is done by

  • dehydrogenation

  • hydrogenation

  • dehydrohalogenation

  • dehydration


22.

Copper is a divalent metal. The value of its electrochemical equivalent is 3.29 × 10-4 g. Its atomic mass is

  • 31.74 g

  • 63.5 g

  • 126.9 g

  • 15.87 g


23.

In ...... process, work is done at the expense of internal energy.

  • isothermal

  • isochoric

  • adiabatic

  • isobaric


24.

The standard reduction potential for Mg2+ /Mg is - 2.37 V and for Cu2+ /Cu is 0.337. The Ecell° for the following reaction is

Mg + Cu2+ → Mg2+ + Cu

  • +2.03 V

  • -2.03 V

  • -2.7 V

  • +2.7 V


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25.

Which is a correct integrated rate equation?

  • k = -2.303t log aa - x

  • k = -2.303t log a - xa

  • - d (a - x) = kdt

  • All are integrated rate equations


26.

For which order reaction, the unit of rate constant is time-1?

  • Zero order

  • First order

  • Second order

  • Third order


27.

The number of electrons required to reduce 4.5 × 10-5 of Al is

  • 1.03 × 1018

  • 3.01 × 1018

  • 4.95 × 1026

  • 7.31 × 1020


28.

Maximum depression in freezing point is caused by

  • potassium chloride

  • sodium sulphate

  • magnesium sulphate

  • magnesium carbonate


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29.

Which of the following is not a colligative property?

  • Elevation in boiling point

  • Lowering of vapour pressure

  • Osmotic pressure

  • Freezing point


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30.

Most basic hydroxide among the following is

  • Lu(OH)3

  • Eu(OH)3

  • Yb(OH)3

  • Ce(OH)3


D.

Ce(OH)3

Due to lanthanide contraction, the size of M3+ ions (i.e. Lu3+, Eu3+, Yb3+ and Ce3+) decreases and thus, the basix strength of their hydroxides decreases.

The order of size of given M3+ ions is

Ce3+ > Eu3+ > Yb3+ > Lu3+

Therefore, the order of basic strength of hydroxides is

Ce(OH)3 > Eu(OH)3 > Yb(OH)3 > Lu(OH)3


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