Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Which of the following is a sink for CO?

  • Haemoglobin

  • Micro-organisms present in the soil

  • Oceans

  • Oceans

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12.

The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is

  • Sublimation

  • Chromatography

  • Crystallisation

  • Crystallisation


D.

Crystallisation

Steam distillation is the most suitable method of separation of 1: 1 mixture of ortho and para nitrophenols as there are intramolecular H-bonds in ortho nitrophenol.

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13.

Which one of the following pairs of species has the same bond order?

  • CO, NO

  • O2, NO+

  • CN, CO

  • CN, CO

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14.

Which is the incorrect statement?

  • FeO0.98 has non stoichiometric metal deficiency defect

  • Density decreases in case of crystals with Schottky's defect

  • NaCl(s) is insulator, silicon is semiconductor,silver is conductor, quartz is piezo electric crystal

  • NaCl(s) is insulator, silicon is semiconductor,silver is conductor, quartz is piezo electric crystal

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15.

Concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.2 ×10–4 mol L–1. Solubility product

  • 2.42 × 10–8

  • 2.66 × 10–12

  • 4.5 × 10–11

  • 4.5 × 10–11

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16.

The species, having bond angles of 120° is

  • PH3

  • CIF3

  • NCl3

  • NCl3

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17.

If molality of the dilute solution is doubled, the value of molal depression constant (Kf) will be

  • Doubled

  • Halved

  • Tripled

  • Tripled

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18.

It is because of inability of ns2 electrons of the valence shell to participate in bonding that

  • Sn2+ is reducing while Pb4+ is oxidising

  • Sn2+ is oxidising while Pb4+ is reducing

  • Sn2+ and Pb2+ are both oxidising and reducing

  • Sn2+ and Pb2+ are both oxidising and reducing

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19.

Which one of the following statements is not correct?

  • Catalyst does not initiate any reaction

  • The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium

  • Enzymes catalyse mainly bio-chemical reactions

  • Enzymes catalyse mainly bio-chemical reactions

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20.

The reason for greater range of oxidation states in actinoids is attributed to

  • The radioactive nature of actinoids

  • Actinoid contraction

  • 5f, 6d and 7s levels having comparable energies

  • 5f, 6d and 7s levels having comparable energies

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