A metal with shining appearance reacts with hot water and also with dilute hydrochloric acid evolving hydrogen gas. Suggest giving reasons why this metal cannot be copper.

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Solution

Metals
Metals are elements that have luster or a shining appearance. They are hard, malleable, and good conductors of electricity and heat.
Few metals like alkali metals are highly reactive and they react vigorously with water and dilute acids and release hydrogen gas.
Metal reactivity series
The order of reactivity of metals is as shown:
Potassium >Sodium >Calcium > Magnesium > Aluminum > Zinc > Iron >Tin > Lead >[H]> Copper > Mercury >Silver >Gold >Platinum
Hence, Copper is less reactive than Hydrogen so it cannot displace Hydrogen from its compounds like water and HCl.

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