1.

Give a chemical test to distinguish between:(a) dilute sulphuric acid and dilute hydrochloric acid(b) dilute sulphuric acid and conc. Sulphuric acid

Answer»

(a) Bring a glass rod dipped in Ammonia solution near the mouth of each test tubes containing dil. Hcl and dil. H2SO4 each.

Dil. HClDil. H2SO4
White fumes of ammonium chlorideNo such fumes

(b)

1. Dilute sulphuric acid treated with zinc gives Hydrogen gas which bums with pop sound. 

Concentrated H2SO4 gives SO2 gas with zinc and the gas turns Acidified potassium dichromate paper green.

2. Barium chloride solution gives white ppt. with dilute H2SO4, This white ppt. is insoluble in all acids. 

Concentrated H2SO4 and NaCl mixture when heated gives dense white fumes if glass rod dipped in Ammonia solution is brought near it.



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