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Periodic Classification of Elements — Science STD 10 — Question

Tamilnadu BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
Question
How does Aluminium react with caustic soda? Give an equation.
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Answer

Aluminium reacts with caustic soda to give sodium meta aluminate with the liberation of $H _2$ gas.
$
2 Al +2 NaOH +2 H _2 O \longrightarrow 2 NaAlO _2+3 H _2 \uparrow
$
Sodium meta aluminate

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