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JEE Main levelOne or more correct optionsDifficulty 2 of 3sb197

Hydrogen gas is evolved when which of the following metals is warmed with concentrated aqueous $NaOH$ ?

AMg
BAl
CCu
DZn

Answer: B, D

Zn and Al are amphoteric and dissolve to give zincate and aluminate with

H X_{2}

:

Zn + 2 NaOH + 2 H X_{2} O Na X_{2} Zn (OH) X_{4} + H X_{2}

. Cu and Mg do not react with aqueous alkali.

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