The components in solder are :

S n

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P b

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Z n

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both

A

and

B

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Solution

The correct option is D both $A$ and $B$
Tin and lead solders also called as soft solders which has 60/40 tin/lead for electrical soldering. The greater the tin concentration greater is the tensile strength.

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P b^{4 +} + S n^{2 +} \to S n^{4 +} + P b^{2 +}

S n^{4 +} + P b^{2 +} \to P b^{4 +} + S n^{2 +}

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Stability of ions of $G e, S n, a n d P b$ will be in the order:

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E^{\circ}

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