1.

Give a chemical test to distinguish between the following pairs of compounds: 1. Sodium chloride solution and sodium nitrate solution. 2. Hydrogen chloride gas and hydrogen sulphide gas. 3. Ethene gas and ethane gas. 4. Calcium nitrate solution and zinc nitrate solution. 5. Carbon dioxide gas and sulphur dioxide gas.

Answer»

1. Sodium chloride gives white ppt. with silver nitrate solution while sodium nitrate does not. 

2. Dense white fumes observed when a rod dipped in NH3 is brought to the mouth of t.t containing HCl gas. Whereas no such fumes observed in case of H2S gas. 

3. Ethene gas decolorises the purple colour of KMnO4 whereas no change observed with ethane. 

4. Add NaOH solution to both the solutions. White ppt. observed with Zn(NO3)2 solution which is soluble in excess. Whereas white ppt. observed with Ca(N)3)2 which is sparingly soluble in water. 

5. SO2 turns acidified potassium dichromate solution green whereas CO2 does not change the colour



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