Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

The pair, that is referred as 'chemical twins' is

  • Ac, Cf

  • Hf, Ta

  • Tc, Re

  • La, Ac


12.

The number of hydroxyl ions in 10 cm3 of 0.2 M HCl solution is

  • 5 × 10-14

  • 3 × 109

  • 3 × 1012

  • 5 × 10-12


13.

Heat of combustion of methane is -800 kJ. What is the heat of combustion for 4 × 10-4 kg of methane?

  • -800 kJ

  • -3.2 × 104 kJ

  • -20 kJ

  • -1600 kJ


14.

Which of the following travels with the speed of light?

  • α-rays

  • β-rays

  • γ-rays

  • X-rays


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15.

Kirchhoff's equation is

  • log k2k1 = Ea2.303 R 1T1 - 1T2

  • log p2p1 = Hv2.303 R T2 - T1T1 × T2

  • Cp = H2 - H1T2 - T1

  • log k2k1 = H2.303 R 1T1 - 1T2


16.

When 10 A current is passed for 80 min, the volume of hydrogen gas liberated is

  • 11.14 L

  • 5.57 L

  • 22.4 L

  • 2.78 L


17.

The IUPAC name of crotonaldehyde is

  • butenaldehyde

  • butanal-1

  • but-2-en-1-al

  • prop-2-en-1-ol


18.

Willemite is

  • Zn2SiO4

  • H2PtCl6

  • ZnO

  • ZnOFe2O3


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19.

Which of the following compounds is optically active?

  • Butanal

  • Butanol

  • Butan-2-ol

  • 2-methyl propan-2-ol


C.

Butan-2-ol

Only chiral or asymmetric carbon (the carbon, four valencies of which are staisfied by four different groups) containing compounds are optically active.

C* = Chiral carbon atom

Therefore, the above figure shows butan-2-ol and is optically active.


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20.

Ethylidene dichloride is obtained by the reaction of excess of HCl with

  • ethylene

  • acetylene

  • propene

  • methane


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