Give reasons why:
Zinc displaces lead from lead nitrate solution while gold is unable to do so.

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Solution

$Z n$ displaces $P b$ from $P b {(N O_{3})}_{2}$ but $A u$ cannot:
The activity series of metals helps in determining the reactivity of the metals. The metal having more reactivity can replace the metal having less reactivity.
The reactivity of the metal is in the order:
$K > N a > C a > M g > A l > Z n > F e > S n >$
$P b > [H] > C u > H g > A g > A u > P t$
The reactivity of zinc is very higher than lead so Zinc can replace lead.
Whereas the reactivity of gold is very low than lead, so gold cannot replace lead.
$Z n + P b {(N O_{3})}_{2} \to Z n {(N O_{3})}_{2} + P b A u + P b {(N O_{3})}_{2} \to N o r e a c t i o n$

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Give reasons why: Zinc displaces lead from lead nitrate solution while gold is unable to do so.

Give reasons why:
Zinc displaces lead from lead nitrate solution while gold is unable to do so.