Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which has the maximum number of molecules among the following?

  • 44 g CO2

  • 48 g O3

  • 8 g H2

  • 8 g H2

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2.

According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?

  • n= 6 to n = 1

  • n = 5 to n = 4

  • n= 6 to n = 5 

  • n= 6 to n = 5 

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3.

Consider the following processes Δ H (kJ/mol)

1/2 A →                               +150
3B   → 2 C + D                     -125
E + A  → 2D                        +350

For  B + D   → E + 2C, ΔH will be 

  • 525 kJ/mol

  • -175 kJ/mol

  • -325 kJ /mol

  • -325 kJ /mol


B.

-175 kJ/mol

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4.

Which of the following structures is the most preferred and hence of lowest energy of SO3

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5.

A bubble of air is underwater at temperature 15o C  and the pressure 1.5 bar. If the bubbles rises to the surface where the temperature is 25o C and the pressure is 1.0 bar, what will happen to the volume of the bubble?

  • Volume will become greater by a factor of 1.6 

  • Volume will become  greater by a factor of 1.1

  • Volume will become  smaller by a factor of 0.70

  • Volume will become  smaller by a factor of 0.70

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6.

What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?

  • -5.1 eV

  • -10.2 eV

  • +2.55 eV

  • +2.55 eV

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7.

Match (I) with list (II) for the  compositions of substances and select the correct answer using the code given below the lists.


 

List I (substance)

 

List II Composition

A.

Plaster of Paris

1.

CaSO4.2H2O

B.

Epsomite

2.

CaSO4. ½ H2O

C.

Kieserite

3.

MgSO4. 7H2O

D.

Gypsum

4.

5.

MgSO4.H2O

CaSO4

  • A

    B

    C

    D

    3

    4

    1

    2

  • A

    B

    C

    D

    2

    3

    4

    1

  • A

    B

    C

    D

    1

    2

    3

    5

  • A

    B

    C

    D

    1

    2

    3

    5

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8.

The half -life of a substance in a certain enzyme catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L-1 is 

  • 414 s

  • 552 s 

  • 690 s

  • 690 s

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9.

Which of the following statements in incorrect?

  • pure sodium metal dissolves in liquid ammonia to give blue solution

  • NaOH reacts with glass to give sodium silicate

  • Aluminium reacts with excess NaOH to give Al(OH)3

  • Aluminium reacts with excess NaOH to give Al(OH)3

459 Views

10.

A 0.1  molal aqueous solution  of a weak  acid is 30%  ionised. if Kf for water is 1.86oC/m, the freezing point of the solution will be 

  • -18oC

  • -0.54oC

  • -0.36oC

  • -0.36oC

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