Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which of the following is not correct ?

  • Hydrolysis of NCl3 gives NH3 and HOCl

  • NH3 is less stable than PH3

  • NH3 is a weak reducing reagent compared to PH3

  • Nitric oxide in solid state exhibits diamagnetic property


2.

Which of the following is correct?

  • The pH of one litre solution containing 0.49 g of H2SO4 is 2.0

  • The conjugate base of H2S is S2-

  • BF3 is a Lewis base

  • Phenolphthalein is colourless in basic medium


3.

Which of the following is correct ?

  • Catalyst undergoes permanent chemical change

  • Particle size of solute in true solution is 10-3 m

  • Starch solution is a hydrosol

  • Hydrolysis of liquid ester in the presence of mineral acid is an example of heterogeneous catalysis reactions


4.

The heat of formation of CO(g) and CO2 (g)are H = -110 and H = - 393 kJ mol-1 respectively. What is the heat of reaction (H) (in kJ mol-1) for the following reaction?

CO (g) + 12O2 (g)  CO2(g)

  • -504

  • -142.5

  • -283

  • 504


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5.

What is the wavelength (in m) of a particle of mass 6.62 x 10-29 g moving with a velocity of 103 ms-1?

  • 6.62 x 10-4

  • 6.62 x 10-3

  • 10-5

  • 105


6.

What is the equation for the equilibrium constant (Kc) for the following reaction?

12A(g) + 13B(g) T(K) 23C(g)

  • Kc = A12 B13C32

  • Kc = C32A2 B3

  • Kc = C23A12B13

  • Kc = C23A12+B13


7.

A 0.5 g/L solution of glucose is found to be isotonic with a 2.5 g/L solution of an organic compound. What will be the molecular weight of that organic compound ?

  • 300

  • 600

  • 900

  • 200


8.

H-O-H bond angle in H2O is 104.5° and not 109° 28' because of

  • lone pair-lone pair repulsion

  • lone pair-bond pair repulsion

  • bond pair-bond pair repulsion

  • high electronegativity of oxygen


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9.

A 0.1 aqueous solution of a weak acid is 2% ionised. If the ionic product of water is 1 x 10-4, the [OH-] is

  • 5 x 10-12 M

  • 2 x 10-3 M

  • 1 x 10-14 M

  • None of these


A.

5 x 10-12 M

Since, it is a weak acid, the equation to calculate [H+] is

 = C x α (α = % of ionisation)

 = 0.1 x 0.02 = 2 x 10-3 M

Kw = [H+][OH-]

[OH-] = Kw[H+] = 1 x 10-142 x 10-3

         = 5 x 10-12 M


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10.

The total number of orbitals in the fifth energy level is

  • 5

  • 10

  • 18

  • 25


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