Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

MY and NY3, two nearly insoluble salts. have the same Ksp values of 6.2 x 10-13 at room temperature. Which  statement would be true in regard to MY and NY3 ?

  • The molar solubility of MY in water is less than that of NY3

  • The salts MY and NY3 are more soluble in 0.5 M KY than in pure water

  • The addition of the Salt of KY to the solution of MY and NY3 will have no effect on their solubilities.

  • The addition of the Salt of KY to the solution of MY and NY3 will have no effect on their solubilities.

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12.

Consider the following liquid-vapour equilibrium

Liquid space rightwards harpoon over leftwards harpoon space Vapour
Which of the following relations is correct?

  • dlnP over dT equals fraction numerator negative increment H subscript v over denominator R T end fraction
  • dlnP over dT squared space equals space fraction numerator negative increment straight H subscript straight v over denominator straight T squared end fraction
  • dlnP over dT space equals space fraction numerator negative increment straight H subscript straight v over denominator RT squared end fraction
  • dlnP over dT space equals space fraction numerator negative increment straight H subscript straight v over denominator RT squared end fraction
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13.

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

  • The eclipsed conformation of ethane is more stable than staggered conformation because eclipsed conformation has no torsional strain

  • The eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain

  • The staggered conformation of ethane is more stable than eclipsed conformation because staggered conformation has no torsional strain

  • The staggered conformation of ethane is more stable than eclipsed conformation because staggered conformation has no torsional strain


C.

The staggered conformation of ethane is more stable than eclipsed conformation because staggered conformation has no torsional strain

Due to the absence of torsional strain staggered conformation of ethane is more stable than eclipsed conformation of it.

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14.

Which of the following statement about hydrogen is incorrect?

  • Hydrogen never acts as cation in ionic salts

  • Hydronium ion, H3O+ exist freely in solution

  • Dihydrogen does not act as a reducing agent

  • Dihydrogen does not act as a reducing agent

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15.

When copper is heated with conc. HNO3 it produces

  • Cu(NO3)2 and NO

  • Cu(NO3)2, NO and NO2

  • Cu(NO3)2 and N2O

  • Cu(NO3)2 and N2O

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16.

A 1000C the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If Kb = 0.52, the boiling point of this solution will be

  • 1000C

  • 1020C

  • 1030C

  • 1030C

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17.

Match the compounds given in column I with the hybridization and shape given in column II and mark the correct option.

Column I

Column II

A.XeF6

1.Distorted octahedral

B.XeO3

2.Square planar

C.XeOF4

3.Pyramidal

D.XeF4

4.Square pyramidal

  • A
    B
    C
    D
      1       2     4      3
  • A
    B
    C
    D
     4       3      1      2
  • A
    B
    C
    D
      4      1      2      3
  • A
    B
    C
    D
      4      1      2      3
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18.

Match items of Columns I with the items of Columns II and assign the correct code.

Column I

Column II

A.Cyanide process

1.Ultrapure Ge

B. Froth floatation process

2.Dressing of ZnS

C.Electrolytic reduction

3.Extraction of Al

D.Zone refining

4.Extraction of Au

 

5.Purification of Ni

  • A
    B
    C
    D
      2       3     1     5
  • A
    B
    C
    D
      1      2      3     4
  • A
    B
    C
    D
       3     4      5     1
  • A
    B
    C
    D
       3     4      5     1
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19.

 Which is the correct statement for the given acids?

  • Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid.

  • phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid

  • Both are triprotic acids

  • Both are triprotic acids

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20.

Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution?

  • The solution is decolourized

  • SO2 is reduced

  • Green Cr2(SO4)3 is formed

  • The solution turns blue


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