Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Which of the following would have a permanent dipole moment?

  • BF3

  • SiF3

  • SF4

  • XeF4


12.

H2S gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because: 

  • presence of HCl decreases the sulphide ion concentration

  • presence of HCl increases the sulphide ion concentration

  • solubility product of group II sulphides is more than that of group IV sulphides

  • sulphides of group IV cations are unstable in HCl


13.

Which one of the following oxides is expected to exhibit paramagnetic behaviour?

  • CO2

  • SO2

  • ClO2

  • SiO2


14.

A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20°C are 440 mm of Hg for pentane and 120 mm of Hg for hexane. The mole fraction of pentane in the vapour phase would be

  • 0.549

  • 0.200

  • 0. 786

  • 0.478


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15.

4.5 g of aluminium (Atomic mass 27 amu) is deposited at cathode from Al3+ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H+ ions in solution by the same quantity of electric charge will be

  • 22.4 L

  • 44.8 L

  • 5.6 L

  • 11.2 L


C.

5.6 L

From second law of Faraday

mAlmH = EAlEH 4.5 mH = 2731mH  = 0.5 gm 2g H2 volume at STP = 22.4 L0.5 gm H2 volume at STP = 22.4 × 0.52 L = 5.6 L


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16.

Which among the following is the most stable carbocation?

  • C+H3

  • CH3C+H2


17.

Products of the following reaction

CH3C.CH2CH3 (2) Hydrolysis(1)O3.... are

  • CH3CHO + CH3CH2CHO

  • CH3COOH + CH3COCH3

  • CH3COOH + HOOC.CH2CH3

  • CH3COOH + CO2


18.

Which one of the following compounds is most acidic?

  • Cl - CH2 - CH2 - OH


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19.

Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions?

(R = Alkyl substituent)


20.

Which one of the following is expected to exhibit optical isomerism? (en = ethylenediamine)

  • cis-[Pt (NH3)2Cl2]

  • trans-[Co (en)2 Cl2]

  • trans- [Pt (NH3)2Cl2]

  • cis-[Co(en)2Cl2]


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