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

What is aqua fortis?

What is : aqua regia 

What is the fixation of Nitrogen?

During thunderstorm, rain water contains nitric acid. Explain with reactions.

1. Write a balanced chemical equation for the laboratory preparation of nitric acid.
2. In the preparation of nitric acid from KNO₃, concentrated hydrochloric acid is not used in place of concentrated sulphuric acid. Explain why?
3. Conc. nitric acid prepared in the laboratory is yellow in colour. Why? How is this colour removed?
4. Give reasons for the following:
   In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated very strongly above 200°C.

In the preparation of nitric acid from KNO3 concentrated hydrochloric acid is not used in place of concentrated sulphuric acid. Explain why?

Conc. Nitric acid prepared in laboratory is yellow in colour why? How is this colour removed?

Give reasons for the following:
In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated very strongly above 200°C. 

Nitric acid cannot be concentrated beyond 68% by the distillation of a dilute solution of HNO₃. State the reason.

Write a balanced equation and name the products formed when sodium hydrogen carbonate is added to nitric acid.

Write a balanced equation and name the products formed when concentrated nitric acid is heated.

 Choose the method of preparation of the following salts, from the methods given in the list:
[List :  A. Neutralization B. Precipitation  C. Direct combination D. Substitution ]
(i) Lead chloride
(ii) Iron (II) sulphate
(iii) Sodium nitrate

(iv) Iron (III) chloride 

 Identify the substance underlined: 
The dilute acid which is an oxidizing agent. 

Explain hydronium ion. Write the ionization of sulphuric acid showing the formation of hydronium ion.

How many salts can be obtained from ortho phosphoric acid? Is there any difference in the salts formed by the acid?

Give the preparation of the salt given in the left column by matching with the methods given in the right column. Write balanced equations for each preparation.

State how would you prepare copper (II) oxide from
Copper nitrate

State how would you prepare copper (II) oxide from
Copper Carbonate

State how would you prepare copper (II) oxide from
copper sulphate

Give equation to prepare the following as directed
MgCO₃ from MgCl₂