Question

give two chemical tests to distinguish between -

1) ethene and ethyne

2) zinc sulphate and zinc chloride

Answer 1

this will help you. this is for ethene and ethyne

Answer 2

Explanation:

1) Treat ethene and ethyne both with sodium acetylides.

Alkene when treated with sodium acetylide give no reaction.

$CH_2=CH_2+NaNH_2\rightarrow$ no reaction

When ethyne is treated with sodium acetylid it gives acetylide.

$CH\equiv CH+NaNH_2\rightarrow HC\equiv C^-Na^+$

2)Treat zinc sulfate and zinc chloride with barium chloride.

Zinc sulfate will react with barium chloride and will give white precipitate of barium sulfate. Where as zinc chloride will shoe no reaction with barium chloride.

$ZnSO_4+BaCl_2\rightarrow BaSO_4(ppt)+ZnCl_2$

$ZnCl_2+BaCl_2\rightarrow$ no reaction