Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which of the following molecules acts as a Lewis acid?

  • (CH)3B

  • (CH3)O

  • (CH3)P

  • (CH3)P

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2.

From the following bond energies:

H-H bond energy: 431.37 kJ mol-

C=C  bond energy: 606.10 kJ mol-

C- C bond energy: 336.49 kJ mol-

C-H bond energy: 410.50 kJ mol-

Enthalpy for the reaction,


will be


  • 1523.6 kJ  mol-

  • -243.6 kJ mol-

  • -1200. kJ mol-

  • -1200. kJ mol-

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3.

Which one of the element with the following outer orbital configuration may exhibit the largest number of oxidation states?

  • 3d5,4s2

  • 3d5,4s1

  • 3d5,4s2

  • 3d5,4s2

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4.

The ionisation constant of ammonium hydroxide is 1.77 x 10-5 at 298 K. Hydrolysis constant of ammonium chloride is 

  • 5.65 x 10-10

  • 6.50 x 10-12

  • 5.65 x 10-13

  • 5.65 x 10-13

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5.

Oxidation number of P in PO43-, of S in SO42- and that of Cr in Cr2O72- are respectively,

  • +5,+6 and +6

  • +3, + 6 and +5

  • +5,+3 and +6

  • +5,+3 and +6

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6.

Amongst the elements with following electronic configuration, which one of them may have the highest ionisation energy?

  • [Ne] 3s2 3p3

  • [Ne] 3s2 3p2

  • [Ar] 3d10, 4s2 4p3

  • [Ar] 3d10, 4s2 4p3

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7.

Maximum number of electrons in a subshell of an atom is determined by the following

  • 4l + 2

  •  2l +1

  • 4l-2

  • 4l-2

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8.

The values of ΔH and ΔS for the reaction, C(graphite) + CO2(g) → 2 CO (g) are 170 kJ and 170 JK-1 respectively. This reaction will be spontaneous at

  • 710 K 

  • 910 K

  • 1110 K

  • 1110 K

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9.

Nitrobenzene can be prepared from benzene by using a mixture of conc. HNO3 and Conc. H2SO4.In the mixture, nitric acid acts as a/an:

  • reducing agent

  • acid

  • base

  • base

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10.

According to MO theory which of the following lists ranks the nitrogen species in terms of increasing bond order?

  • straight N subscript 2 superscript minus space less than space straight N subscript 2 space less than space straight N subscript 2 superscript 2 minus end superscript
  • straight N subscript 2 superscript 2 minus end superscript less than space straight N subscript 2 superscript minus space less than space straight N subscript 2
  • straight N subscript 2 space less than space straight N subscript 2 superscript 2 minus end superscript space less than straight N subscript 2 superscript minus
  • straight N subscript 2 space less than space straight N subscript 2 superscript 2 minus end superscript space less than straight N subscript 2 superscript minus


A.

straight N subscript 2 superscript minus space less than space straight N subscript 2 space less than space straight N subscript 2 superscript 2 minus end superscript

Bond Order = ><br>Where <br>N<sub>b</sub> = number of electrons in bonding MO<br><br>N<sub>a</sub> = number of electrons in antibonding MO<br><br><br><img class=

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