(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Chemistry

Why does pure nitric acid take on a yellowish brown colour when exposed to light?

Write the composition of the following:

 Methylated spirit

Write the composition of the following:

Power alchohol

Write the composition of the following:

Spurious alchohol

The first step in the manufacture of nitric acid is the catalytic oxidation of ammonia. What is the name of the catalyst?

When nitric acid is prepared by the action of concentrated sulphuric acid on potassium nitrate. what is the special feature of the apparatus used?

Write the equation for the laboratory preparation of nitric acid from potassium nitrate and concentrated sulphuric acid.

A neutral compound'X' of molecular formula C₂H₆0 on oxidation with
acidified potassium dichromate gives a compound 'Y' .Compound 'X' react
with 'Y' on warming in presence of conc.H₂S0₄ to give a sweet smelling
substance 'Z'. What are 'X','Y', and'Z'? Give equations of the reaction
involved.

Dilute nitric acid is generally considered a typical acid except for its reaction with metals. In what way is dilute nitric acid different from other acids when it reacts with metals?

Write the equation for the reaction of dilute nitric acid with copper.

Write the equations to show what happens when ethyne gas reacts with

Excess of hydrochloric acid

Account for the yellow colour that appears in concentrated nitric acid when it is left standing in an ordinary glass bottle.

How will you convert

 Ethyne to acetaldehyde

Give the reactions of ethyne with Water.

Explain, why only all glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.

Give the reactions of ethyne with  Bromine.

Explain the following:

Ethane does not undergo addition reactions

Write a chemical equation to illustrate the acidic nature of nitric acid.

Explain the following:

Ethyne is used for welding and cutting metals

The figure given below illustrates the apparatus used in the laboratory preparation of nitric acid:

(i) Name A (a liquid), B( a Solid) and C(a liquid).
(ii) write the balanced chemical equation to show how nitric acid undergoes decomposition.
(iii) Write the balanced chemical equation for the reaction in which copper is oxidized by concentrated nitric acid.