Question

Which one of the following salt solutions on reaction with excess NaOH solution gives a clear solution finally.
a.Pb(NO3) 2

b. CuSO 4

c FeCl 3​

Answer 1

Answer:

a option

a.Pb(NO3) 2

Explanation:

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Answer 2

The correct option is a.

• $Pb(NO_3)_2$ on reaction with excess NaOH form a colorless salt $Pb(OH)_2$. This salt of reaction with excess NaOH gives a clear solution.The reactions are-

$Pb(NO_3)_2+2NaOH\rightarrow Pb(OH)_2+2NaNO_3$

$Pb(OH)_2+2NaOH\rightarrow Na_2PbO_2+2H_2O$

$Na_2PbO_2$ is the colorless solution.

• Copper sulphate on reaction with excess NaOH give a pale blue color precipitate of copper hydroxide.
• Ferric chloride on reaction with excess NaOH give a reddish brown color precipitate of ferric hydroxide.