Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

HgCl2 and I2 both when dissolved in water containing I ions the pair of species formed is

  • HgI2 , I3-

  • Hgl2, I-

  • HgI43-, I3-

  • HgI43-, I3-


C.

HgI43-, I3-

In a solution containing HgCl2, I2 and I–, both HgCl2 and I2
compete for I.
Since formation constant of [HgI4]2– is 1.9 × 1030
which is very large as compared with I3 (Kf= 700)
therefore, I will preferentially combine with HgCl2
HgCl2 + 2l- → Hgl2↓ + 2Cl-
Hgl2 + 2l- → [Hgl4]2-

2970 Views

2.

A gas is allowed to expand in a well-insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy ΔU of the gas in joules will be

  • 1136.5 J

  • -500 J

  • -505 J

  • -505 J


C.

-505 J

ΔU = q + w
For adiabatic process, q = 0
∴ ΔU = w
= – P·ΔV
= –2.5 atm × (4.5 – 2.5) L
= –2.5 × 2 L-atm
= –5 × 101.3 J
= –506.5 J
= –505 J

2584 Views

3.

The element Z = 114 has been discovered recently. It will belong to which of the following family group and electronic configuration?

  • Halogen family, [Rn] 5f14 6d10 7s7p5

  • Carbon family, [Rn] 5f14 6d10 7s7p2

  • Oxygen family,[Rn] 5f14 6d10 7s7p4

  • Oxygen family,[Rn] 5f14 6d10 7s7p4


B.

Carbon family, [Rn] 5f14 6d10 7s7p2

Z = 114 belong to Group 14, carbon family Electronic configuration , [Rn] 5f14 6d10 7s7p2

1968 Views

4.

Which of the following pairs of compounds is isoelectronic and isostructural?

  • BeCl2, XeF2

  • Tel2, XeF2

  • IBr2- , XeF 

  • IBr2- , XeF 


C.

IBr2- , XeF 

IBr2, XeF2
The total number of valence electrons are equal in both the species and both the species are linear also.

2383 Views

5.

20-litre container at 400 K contains CO2(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the containers is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of CO2 attains its maximum value, will be

Given that: SrCO3 ⇌ SrO(s) + CO2(g) kp = 1.6 atm)

  • 5 litre

  • 10 litre

  • 8 litre

  • 8 litre


A.

5 litre

Max. the pressure  of CO2= Pressure of CO2 at equilibrium
For reaction, SrCO3 ⇌ SrO(s) + CO2(g)

Kp= PCO2 = 1.6 atm = maximum pressure of CO2
Volume Container at this stage,
V= nRT/P .... (i)

Since container is sealed and reaction was not  earlier at equilibrium
therefore, n = constant
n= Pv/RT  .... (ii)
from equation (i) and (ii) we get
V = (0.4 x 20)/RT = 5 Litre

3397 Views

6.

Which one is the wrong statement?

  • de-Broglie's wavelength is given by λ = h/mv,
    where m = mass of the particle, v = group velocity of the particle

  • The uncertainty principle is increment straight E space straight x space increment straight t space greater or equal than space fraction numerator straight h over denominator 4 straight pi end fraction

  • Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement

  • Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement


D.

Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement

1651 Views

7.

With respect to the conformers of ethane, which of the following statements is true?

  • Bond angle remains same but bond length changes

  • Bond angle changes but bond length remains same

  • Both bond angle and bond length change

  • Both bond angle and bond length change


D.

Both bond angle and bond length change

There is no change in bond angles and bond lengths in the conformations of ethane. There is only change in dihedral angle.

7424 Views

8.

Match the interhalogen compounds of column I with the geometry in column II and assign the correct code

Column I Column II
a) XX' (i) T-shape

b) XX3'

(ii) Pentagonal
bipyramidal

c) XX'5

(iii) Linear
d) XX'7 (iv) Square-pyramidal
  (v) Tetrahedral
  • (a) (b) (c) (d)
    (iii) (iv) (i) (ii)
  • (a) (b) (c) (d)
    (iii) (i) (iv (ii)
  • (a) (b) (c) (d)
    (iv) (v) (iii) (ii)
  • (a) (b) (c) (d)
    (iv) (v) (iii) (ii)


B.

(a) (b) (c) (d)
(iii) (i) (iv (ii)
1176 Views

9.

The correct statement regarding electrophile is

  • Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile

  • Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile

  • Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile

  • Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile


D.

Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile

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10.

For a given reaction, ΔH = 35.5 kJ mol–1 and ΔS = 83.6 JK–1 mol–1. The reaction is spontaneous at (Assume that ΔH and ΔS do not vary with temperature)

  • T < 425 K

  • T > 425 K

  • All temperatures

  • All temperatures


B.

T > 425 K

∵ ΔG = ΔH – TΔS
For a reaction to be spontaneous, ΔG = –ve
i.e., ΔH < TΔS

therefore, T> ΔH/ΔS
= 35.5 x 103J/83.6JK-1
i.e T>425 K

2477 Views