CBSE EXAMINATION PAPER-2023

A compound undergoes complete tetramerization in a given organic solvent. The van'ts Hoff factor 'i' is:

Which of the following structures represents -D-glucose ?

The ions of metals of Group 12 (Zn, Cd and Hg) have completely filled d orbitals and so they:

[Co(NH₃)₅NO₃]SO₄ and [Co(NH₃)₅SO₄]NO₃ exhibit:

Reaction of 1-phenyl-2-chloropropane with alcoholic KOH gives mainly:

The reduction of ethanenitrile with sodium and alcohol gives:

How many Faradays are required to reduce 1 mol of MnO₄⁻ to Mn²⁺ ?

In a reaction, the initial concentration of the reactants increases four fold and the rate becomes sixteen times its initial value. The order of the reaction is:

On hydrolysis, which of the following carbohydrates gives only glucose?

Deficiency of which of the following vitamins causes Pernicious anaemia?

This reaction is known as:

In which of the following does the central atom exhibit an oxidation state of +3?

Assertion (A) : When NaCl is added to water, a depression in freezing point is observed.

Reason (R) : The lowering of vapour pressure of a solution causes depression in the freezing point.

Assertion (A) : Zr and Hf have almost identical radii.

Reason (R) : Both Zr and Hf exhibit similar properties.

Assertion (A) : Monobromination of aniline can be conveniently done by protecting the amino group by acetylation.

Reason (R) : Acetylation decreases the activating effect of the amino group.

What type of deviation from Raoult's Law is shown by a mixture of ethanol and acetone ? Give reason.

Define Azeotrope. What type of azeotrope is formed by negative deviation from Raoult's law? give an example .