ICSE CHEMISTRY CLASS 10 NITRIC ACID - 3

NITRIC ACID - 3

1.      The acid produced when conc. HNO₃ oxidizes Sulphur.

2.      A strong acid which on thermal decomposition gives nascent Oxygen atoms.

3.      A metal which can give Hydrogen gas with very dilute Nitric acid.

4.      A metal which shows passivity with conc. Nitric acid.

5.      The mixture of two concentrated acids which is used to dissolve Gold and Platinum.

6.      A compound which is used in photography.

7.      The compound which on thermal decomposition gives a buff residue along with reddish brown vapours.

8.      A crystalline blue salt which on heating gives a black residue with reddish brown vapours.

Give reasons

1.      Pure Nitric acid takes yellow brown colour when exposed to the light.

2.      Only all glass apparatus should be used in the laboratory preparation of Nitric acid.

3.      Iron is rendered passive with fuming Nitric acid.

4.      Nitric acid prepared in lab is in yellow colour.

5.      Dil. Nitric acid does not give Hydrogen gas with active metals.

6.      Higher ratio of air is used in Ostwald’s process.

State your observations

1.      Conc. Nitric acid is added to Copper turnings.

2.      Dil. Nitric acid is added to Copper turnings.

3.      Nitric oxide is passed into gas jar containing Oxygen gas.

4.      A salt containing nitrate ion is heated with conc. Sulphuric acid and Copper.

5.      Lead nitrate crystals are heated in a hard glass test tube.