Subject

Chemistry

Class

NEET Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

21.

Dihedral angle between two methyl groups of n-butane in the gauche and anti forms are

  • 60°, 0°

  • 0°, 60°

  • 60°, 180°

  • 180°, 60°


22.

The vapour pressure of 100g water reduces from 3000 Nm-2 to 2985 Nm-2 when 5g of substance 'X' is dissolved in it. Substance 'X' is

  • methanol

  • glucose

  • carbon dioxide

  • cannot predict


Advertisement

23.

The complex ion which has no d-electrons in the central metal atom is

  • [MnO4]-

  • [Co(NH3)6]3+

  • [Fe(CN)6]3-

  • [Cr(H2O)6]3+


A.

[MnO4]-

In [MnO4]-, the oxidation state of Mn is + 7

Mn(25) = [Ar] 3d54s2

Mn7+ = [Ar]

Thus, in [MnO4]- no d-electron is present.


Advertisement
24.

White P reacts with caustic soda, the products are PH3 and NaH2PO2. This reaction is an example of

  • hydrolysis

  • reduction

  • disproportionation

  • neutralisation


Advertisement
25.

The solubility of saturated solution of Ag2CrO4 is s mol L-1. What is its solubility product?

  • 4s3

  • s3

  • 2s3

  • 16s2


26.

For a reaction, A+ B  Product, the rate is given by,

r = k[A]1/2[B]2

What is the order of the reaction?

  • 0.5

  • 2

  • 2.5

  • 1


27.

How long it will take to deposit 1.0 g of chromium when a current of 1.25 A flows through a solution of chromium (III) sulphate ? (Molar mass of Cr = 52)

  • 1.24 min

  • 1.24 h

  • 1.24 s

  • None of these


28.

If a be the edge length of the unit cell and r be the radius of an atom then for fee arrangement, the correct relation is

  • 4a = 3r

  • 4r = 3a

  • 4r = 2a

  • 4r = a2


Advertisement
29.

The number of phase in a colloidal system is

  • 1

  • 2

  • 3

  • 4


30.

A solid AB has the NaCl structure. If radius of cation A+ is 120 pm, the maximum possible value of the radius of the anion B- is

  • 240 pm

  • 60 pm

  • 49.6 pm

  • 290 pm


Advertisement