Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

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

1736 Views

22.

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

1347 Views

23.

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

2616 Views

24.

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

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25.

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

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26.

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

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27.

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

576 Views

28.

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

  • hexacyanoiron (III) ion

  • hexacyanitoferrate (III) ion

  • tricyanoferrate (III) ion

  • tricyanoferrate (III) ion

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29.

The vacant space in bcc lattice cell is 

  • 26%

  • 48%

  • 23%

  • 23%

728 Views

30.

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

  • 2

  • 1

  • 3

  • 3

2845 Views

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