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  4. In an ionic compound moles ratio of cation to anion is 1: 2. If atomic masses of metal and non-metal respectively are 138 and 19, then correct statement is

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Q. In an ionic compound moles ratio of cation to anion is $1 : 2$. If atomic masses of metal and non-metal respectively are $138$ and $19$, then correct statement is

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Solution:

Metal $\Rightarrow $ Cation $\to A\left(138\right)$
Non-metal$\Rightarrow $ Anion $\Rightarrow B\left(19\right)$
Ionic compound$=AB_{2}$
$\therefore $ Formula mass (G.M.M. for ionic compound)
$=138+2\times19=176$