long answer type question :-)
1. what may happen when :
a)- sodium is dropped on water ?
b)- A copper nail is placed in the solution of iron sulphate ?
c)-
Answers
ANSWER
(i) When sodium metal is dropped in water, an exothermic reaction occurs due to which the evolved hydrogen gas catches fire.
2Na(s)+2H
2
O(l)→2NaOH(aq)+H
2
(ii) sodium metal is heated in free supply of air to form sodium peroxide and sodium oxide.
2Na(s)+O
2
(g)→Na
2
O(s) minor product
Na
2
O
2
(s)+2H
2
O(l)→2NaOH(aq)+H
2
O
2
(l)
(iii) sodium peroxide dissolves in water to form hydrogen peroxide.
Na
2
O
2
(s)+2H
2
O(l)→2NaOH(aq)+H
2
O
2
(l)
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Answer:
1) Sodium metal reacts rapidly with water to form a colourless basic solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The reaction continues even when the solution becomes basic. The resulting solution is basic because of the dissolved hydroxide.
2) When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed in the surface of iron and the colour of copper sulphate solution changes from blue to pale green.