CBSE Class 10 Science 2017 Outside Delhi Term II Set 2 Paper

Question : 7 of 12

Marks: +1, -0

What happens when
(write chemical equation in each case)
(a) ethanol is burnt in air ?
(b) ethanol is heated with excess conc.

{\H}_2 {\SO}_4

443 {\K}

?
(c) a piece of sodium is dropped into ethanol?

Solution:

(a)

{\CH}_3 {\CH}_2 {\OH}+3 {\O}_2 {───────▶ }↖{\;\text " Air "\;} 2 {\CO}_2+3 {\H}_2 {\O}+

Heat + light
(b)

{\CH}_3 {\CH}_2 {\OH} {───────▶ }↖{\;\text " Conc. "\; {\H}_2 {\SO}_4} ↙{∆, 443 k}{\CH}_2= {\CH}_2

(c)

2 {\CH}_3 {\CH}_2 {\OH}+2 {\Na} → 2 {\CH}_3 {\CH}_3 {\ONa} + {\H}_2 ↑

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