Question

1) An element 'X' forms an oxide with formula
$X_{2} O_{3}$
I) State the valency of 'X'



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Answer 1

$\huge\mathcal{{\color{orange}{ᴀɴ}}{\red{S}}{\color{maroon}{ᴡᴇʀ}}~~{\color{black}{↓~↓}}}$

$\sf{ }$

$\sf Here \: the \: element \: \: ‘x’ \: \: \: is \: aluminium \\ \sf Valency \: of \: aluminium : \: \: { \red{ \underline{ \boxed{ \bf 3}}}} \: \: \: \: \: \: \:~~~ \: \: \\ \\ \bf \therefore { \underline{Correct \: formula}} : \red{Fe_{2}O_{3}} \: \: \: \: \: \: \: \: \: \: \: \: \:$

Answer 2

Formula of oxide X2O3

So, valency of X will be 3

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