Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

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

  • Doubled

  • Halved

  • Tripled

  • Tripled


D.

Tripled

Kf (molal depression constant) is a characteristic of solvent and is independent of molality.

1884 Views

12.

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


A.

Sn2+ is reducing while Pb4+ is oxidising

Inability of ns2 electrons of the valence shell to participate in bonding on moving down the group in heavier p-block elements is called inert pair effect
As a result, Pb(II) is more stable than Pb(IV)
Sn(IV) is more stable than Sn(II)
∴ Pb(IV) is easily reduced to Pb(II)
∴ Pb(IV) is oxidising agent
Sn(II) is easily oxidised to Sn(IV)
∴ Sn(II) is reducing agent

1672 Views

13.

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


D.

4.5 × 10–11

Ag subscript 2 straight C subscript 2 straight O subscript 4 space left parenthesis straight s right parenthesis space rightwards harpoon over leftwards harpoon space stack 2 space Ag to the power of plus with 2 straight s below space left parenthesis aq right parenthesis space plus space stack straight C subscript 2 straight O subscript 4 superscript 2 minus end superscript with straight s below space left parenthesis aq right parenthesis
straight K subscript SP space equals space left square bracket Ag to the power of plus right square bracket space equals space 2.2 space straight x space 10 to the power of negative 4 end exponent space straight M
therefore comma space left square bracket straight C subscript 2 straight O subscript 4 to the power of 2 minus end exponent right square bracket space equals space fraction numerator 2.2 space straight x space 10 to the power of negative 4 end exponent over denominator 2 end fraction space straight M space equals space 1.1 space straight x space 10 to the power of negative 4 end exponent space straight M
therefore space straight K subscript SP space equals space left parenthesis 2.2 space straight x space 10 to the power of negative 4 end exponent right parenthesis squared space left parenthesis 1.1 space straight x space 10 to the power of minus to the power of 4 space right parenthesis
space equals space 5.324 space straight x space 10 to the power of negative 12 end exponent
3926 Views

14.

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

  • CO, NO

  • O2, NO+

  • CN, CO

  • CN, CO


D.

CN, CO

CN() and CO have bond order 3 each.

1359 Views

15.

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.

1843 Views

16.

Which of the following is a sink for CO?

  • Haemoglobin

  • Micro-organisms present in the soil

  • Oceans

  • Oceans


B.

Micro-organisms present in the soil

Micro-organisms present in the soil is a sink for CO

5003 Views

17.

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


C.

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

1045 Views

18.

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


A.

FeO0.98 has non stoichiometric metal deficiency defect

D.

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

Frenkel defect occurs in those ionic compounds in which size of cation and anion is largely different.
The non-stoichiometric ferrous oxide is Fe0.93–0.96O1.00 and it is due to metal deficiency defect.

1118 Views

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


B.

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

A catalyst decreases activation energies of both the forward and backward reaction by the same amount, therefore, it speeds up both forward and backward reaction by the same rate. The equilibrium constant is therefore not affected by the catalyst at a given temperature.

1009 Views

20.

The species, having bond angles of 120° is

  • PH3

  • CIF3

  • NCl3

  • NCl3


D.

NCl3

1500 Views