Select the odd one out and justify your answer
Zn, Fe, Mg and Na

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Solution

Sodium is highly reactive, so it reacts violently with dilute acid, while all other elements react moderately with dilute acid to liberate hydrogen gas.

In case of sodium, the hydrogen obtained catches fire due to the highly exothermic nature of the reaction.

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Complete and balance the following reactions.

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(d) $Z n + H_{2} O \to$ ___________+_________

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(f) $Z n + H C l \to$ _____________+__________

(g) $A l + H_{2} S O_{4} \to$ __________+_________

(h) $F e + H C l \to$ ___________+____________

(i) $Z n + N a O H \to$ __________+____________

(j) $A l + K O H + H_{2} O$ _________+____________

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