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NEET Chemistry Solved Question Paper 2016

Multiple Choice Questions

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

Internal energy
Enthalpy
Activation energy
Activation energy

5107 Views

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

1473 Views

Two electrons occupying the same orbital are distinguished by

Magnetic quantum number
Azimuthal quantum number
Spin quantum number
Spin quantum number

1693 Views

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

1993 Views

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

1250 Views

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

2075 Views

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

2269 Views

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

1844 Views

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)

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

The electron gain enthalpy is defined as the energy released when an electron is added to a neutral gaseous atom to convert it into a negative ion. Large negative values of electron gain enthalpy indicate that it is easier to add an electron to an atom to convert it into an anion, and hence large amount of energy is released. The electron gain enthalpies in halogens decreases in the order
Cl>F>Br>I

because as we proceed down a group because the size of the atom increases. Therefore the distance of the nucleus from the valence orbital (which accepts the additional electron) increases. Hence the force by which the additional electron is attracted by the nucleus also decreases and the electron gain enthalpies become less negative as we proceed down a group.

1124 Views

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?

3652 Views