Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

The name of complex ion, [Fe(CN)6]3- is 

  • hexacyanoiron (III) ion

  • hexacyanitoferrate (III) ion

  • tricyanoferrate (III) ion

  • tricyanoferrate (III) ion


D.

tricyanoferrate (III) ion

When complex- ions is an anion, the name of the metal ends with the suffix -ate along with its oxidation number in the complex- ion.

[Fe(CN)6]3- = Hexacyanidoferrate (III) ion

977 Views

22.

Number of possible isomers for the complex [Co(en)2Cl2]Cl will be 
(en =ethylenediamine)

  • 2

  • 1

  • 3

  • 3


C.

3

[Co(en)2Cl2]Cl
Possible isomers are


Hence,total number of stereoisomers = 2+1 = 3

2845 Views

23.

The stability of +1 oxidation state among Al, Ga, In and TI increases in the sequence

  • Ga<In< Al<Tl

  • Al<Ga<In<Tl

  • Tl<In<Ga<Al

  • Tl<In<Ga<Al


B.

Al<Ga<In<Tl

Al< Ga< In <Tl

This is due to inert pair effect or tendency of ns2 electrons do not participate in bond formation.
This tendency decreases on moving down the group.

1347 Views

24.

Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation?

  • FeSO4

  • FeSO3

  • FeC2O4

  • FeC2O4


A.

FeSO4

FeSO4 will require the least amount of acidified KMnO4 for complete oxidation.

2500 Views

25.

The variation of the boiling point of the hydrogen halides in the order HF >  HI > HBr > HCl. What explains the higher boiling point of hydrogen fluoride?

  • The electronegativity of fluorine is much higher than for other elements in the group

  • There is strong hydrogen bonding between HF molecules

  • The bond energy of HF molecules is greater than in other hydrogens halides

  • The bond energy of HF molecules is greater than in other hydrogens halides


B.

There is strong hydrogen bonding between HF molecules

There is a strong hydrogen bonding between HF molecules. Hence, the boiling point is highest for HF.

HF > HI > HBr > HI

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26.

The correct statement regarding defects in the crystalline solid is 

  • Schottky defects have no effect on the density of crystalline solid

  • Frenkel defect decreases the density of crystalline solids

  • Frenkel defect is a dislocation defect

  • Frenkel defect is a dislocation defect


C.

Frenkel defect is a dislocation defect

In Frenkel defect, ions in solid dislocate from their position. Hence, Frenkel defect is a dislocation defect. 

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27.

The sum of coordination number and oxidation number of the metal M in the complex [M(en)2(C2O4)]Cl (where en is ethylenediamine) is 

  • 9

  • 6

  • 7

  • 7


B.

6

Given complex compound is [M(en)2(C2O4)]Cl

Let oxidation number of M is x

therefore,   x- 2 - 2 = -1

 x = +3

Now, as coordination number is defined as the total number of binding sites attached to the metal.Hence, in the given complex coordination number is 6.

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28.

The vacant space in bcc lattice cell is 

  • 26%

  • 48%

  • 23%

  • 23%


D.

23%

Packing efficiency in bcc lattice = 68%

Vacant space in bcc lattice = 100-68 = 32%

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29.

In the extraction of copper from its sulphide ore, the metal finally obtained by the reduction of cuprous oxide with 

  • Iron (II) sulphide

  • Carbon monoxide

  • Copper (I) sulphide

  • Copper (I) sulphide


C.

Copper (I) sulphide

Reduction of Copper oxide done with Copper (I) sulphide.

Cu2S + 2Cu2O → 6Cu +SO2 ↑

803 Views

30.

The rate of constant of the reaction A → B is  0.6 x 10-3 mole per second. If the concentration of A is 5 M then concentration of B after 20 min is 

  • 1.08 M

  • 3.60 M

  • 0.36 M

  • 0.36 M


D.

0.36 M

For a zero -order reaction unit of the rate constant is mole per second. Hence, we can easily calculate concentration of B after 20 min by the following formula,

x = Kt

x = Kt = 0.6 x 10-3 x 20 x 60 = 0.72 M

3310 Views