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Stoichiometry

Which of the ...

Question

Which of the following oxides is/are soluble in ${N a O H}_{(a q)}$ ?

Z n O

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A l_{2} O_{3}

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F e_{2} O_{3}

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S n O_{2}

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Solution

The correct options are
A $Z n O$
B $A l_{2} O_{3}$
D $S n O_{2}$
$Z n O, A l_{2} O_{3}$ and $S n O_{2}$ are soluble in $N a O H (a q)$ , as these on reacting with NaOH can give Zincate, aluminate , and tinnate ion and releases $H_{2}$ gas.

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