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Question

Match the following metals with their metallic salt formed when they react with NaOH.

A
Sodium zincate
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B
Sodium plumbite
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C
Sodium aluminate
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Solution

Aluminium (Al), lead (Pb) and zinc (Zn) react with NaOH to produce the corresponding metallic salt along with the evolution of hydrogen gas.

Zn produces sodium zincate (Na2ZnO2), Pb produces sodium plumbite (NaPbO2) and Al produces sodium aluminate (NaAlO2).

Zn(s) + 2NaOH(aq) Na2ZnO2(aq) + H2(g)

Pb(s) + 2NaOH(aq) Na2PbO2(aq) + H2(g)

2Al(s) + 2NaOH(aq) +2H2O(l) 2NaAlO2(aq) + 3H2(g)


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