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

On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate however dissolves on addition of excess of ammonia solution. Identify (choose from Na, Al, Zn, Pb, Fe)

Which metal salt solution was used?

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

On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate however dissolves on addition of excess of ammonia solution. Identify (choose from Na, Al, Zn, Pb, Fe)

What is the formula of the white gelatinous precipitate obtained?

You are provided with the following chemicals:

NaOH, Na₂CO₃, H₂O, Zn(OH)₂, CO₂, HCI, Fe, H₂SO₄, CI₂, Zn.

Using the suitable chemicals from the given list only, state briefly how you would prepare iron (III) chloride.

Explain why It is necessary to find out the ration of reactants required in the preparation of sodium sulphate.

Explain why fused calcium chloride is used in the preparation of FeCI₃?

How will you distinguish NH₄OH solution from NaOH solution?

Name the metal hydroxides which are insoluble in ammonium hydroxide solution.

Name the metal hydroxides which are soluble in ammonium hydroxide solution.

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 sulphuric acid is used in place of hydrochloric acid. Why?

Give reason why concentrated nitric acid prepared in the laboratory is yellow in colour. State how the colour of the acid is 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.