ICSE CHEMISTRY CLASS 10 - Give reasons - Nitric acid

ICSE CHEMISTRY CLASS 10 - Give reasons - Nitric acid

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

Ans: Nitric acid decomposes to give Nitrogen dioxide which remains dissolved in Nitric acid which imparts the yellow colour to the acid.

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

Ans: Highly corrosive Nitric acid vapours attack the rubber or cork but not glass.

3.     Iron is rendered passive with fuming Nitric acid.       

Ans: Nitric acid oxidizes Iron which results in the formation of a layer which stops the further reaction.       

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

Ans: Nitrogen dioxide remains dissolved in Nitric acid.

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

Ans: Dilute nitric acid being an oxidizing agent oxidizes Hydrogen to Water.

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

Ans: Oxygen is required in the all the three steps of the process.

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LABORATORY PREPARATION OF NITRIC ACID - Class 10 - ICSE

LABORATORY PREPARATION OF NITRIC ACID

The following diagram describes the set up of the apparatus while preparation of Nitric acid by Laboratory method.

The reactants used in this method are Concentrated Sulphuric acid and Potassium nitrate/ Sodium nitrate.

The entire apparatus used in this method is made up of Glass only. The vapours of Nitric acid are highly corrosive and attack rubber or cork.

The Nitric acid prepared in this method appears with yellow tinge due to dissolved Nitrogen dioxide in it which is formed as a result of thermal decomposition of Nitric acid.

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OBSERVATIONS - NITRIC ACID class 10 icse chemistry

OBSERVATIONS - NITRIC ACID

NITRIC ACID

State your observations

1.      Conc. Nitric acid is added to Copper turnings. Ans: Reddish brown gas and a blue filtrate. 

2.      Dil. Nitric acid is added to Copper turnings. Ans: A blue filtrate is formed.

3.      Nitric oxide is passed into gas jar containing Oxygen gas. Ans: Reddish brown fumes.

4.      A salt containing nitrate ion is heated with conc. Sulphuric acid and Copper. Ans: Reddish brown fumes

5.      Lead nitrate crystals are heated in a hard glass test tube. Ans: a buff residue fuses with the test tube and reddish brown fumes evolved.

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