In an ionic compound moles ratio of cati...

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

(a)molecular mass of compound is 176

(b)formula mass of compound is 176

(c )formula mass of compound is 157

(d)molecular mass of compound is 157

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The correct Answer is:

Metal `implies` Cation`rarr `A(138)
Non-metal`implies `Anion`implies B(19)`
Ionic compound`=AB_(2)`
`:.` Formula mass (G.M.M. for ionic compound)
`=138+2xx19=176`

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