Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The addition of a catalyst during a chemical reaction alters which of the following quantities ?

  • Internal energy

  • Enthalpy

  • Activation energy

  • Activation energy

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2.

Predict the correct order among the following.

  • long pair-lone pair> bond pair-bond pair> lone pair>bond pair

  • bond pair-bond pair> lone pair-bond pair > lone pair -lone pair

  • lone pair -bond pair > bond pair- bond pair> lone pair -lone pair

  • lone pair -bond pair > bond pair- bond pair> lone pair -lone pair

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3.

Two electrons occupying the same orbital are distinguished by

  • Magnetic quantum number

  • Azimuthal quantum number

  • Spin quantum number

  • Spin quantum number

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4.

The electronic configuration of Eu (Atomic no.63), Gd (Atomic no. 64) and Tb (Atomic no. 65) are

  • [Xe]4f6 5d1 6s2, [Xe] 4f7 5d1 6s2 and [Xe] 4f9  6s2 

  • [Xe] 4f6 5d1 6s2 , [Xe] 4f7 5d1 6s2 and [Xe] 4f8 5d1 6s2 

  • [Xe] 4f7  6s2, [Xe] 4f7 5d1 6s2 and [Xe] 4f9 6s2 

  • [Xe] 4f7  6s2, [Xe] 4f7 5d1 6s2 and [Xe] 4f9 6s2 

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5.

Which one of the following characteristics is associated with adsorption?

  • ΔG, ΔH and  ΔS all are negative

  • ΔG and  ΔH are negative but  ΔS is positive

  • ΔG and  ΔS are negative but  ΔH is positive

  • ΔG and  ΔS are negative but  ΔH is positive

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6.

The pair of an electron in the given carbanion,CH subscript 3 straight C identical to straight C to the power of minus is present in which orbital? 

  • sp3

  • sp2

  • sp

  • sp

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7.

Consider the molecules CH4, NH3 and H2O. Which of the given statement is false?

  • The H-O-H bond angle in H2O  is larger than the H-C-H bond angle in CH4.

  • The H-O-H bond angle in H2O is smaller than the H-N-H bond angle in NH3.

  • The H-C-H bond angle in CH4 is larger than the H-N-H bond angle in NH3

  • The H-C-H bond angle in CH4 is larger than the H-N-H bond angle in NH3

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8.

The correct thermodynamic conditions for  the spontaneous reaction at all temperatures is

  • ΔH> 0 and Δ S< 0
  • ΔH< 0 and ΔS > 0
  • ΔH ΔS >0
  • ΔH ΔS >0


B.

ΔH< 0 and ΔS > 0

According to the Gibbs-Helmholtz reaction for spontaneity as,

ΔG =ΔH-TΔS

For reaction to being spontaneous, ΔG must be negative.
For this ΔH should be negative ΔS should be positive.
therefore,

ΔHΔS >0.


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9.

In which of the following options the order of arrangement does not agree with the variation of the property indicated against it?

  • B<C<N<O (increasing first ionisation enthalpy)

  • I<Br<Cl<F(increasing electron gain enthalpy)

  • Li<Na<K<Rb (increasing metallic radius)

  • Li<Na<K<Rb (increasing metallic radius)

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10.

Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both can escape. What fraction of the oxygen escapes in the time required for one-half of the hydrogen to escape?

  • 1/4

  • 3/8

  • 1/2

  • 1/2

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