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In an ionic substance, mole ratio of cation to anion is 1 : 2. If atomic mass of metal cation and non-metal anion respectively are 138 and 19 amu then, the most correct statement preferentially is

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molecular mass of compound is 176 amu

formula mass of substance is 176 amu

formula mass of compound is 157 amu

molecular mass of substance is 157 amu

answer is B.

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Detailed Solution

Mass of Metal cation (A) is 138 amu

Mass of Non-metal anion (B) is 19 amu

The mole ratio of cation to anion is 1:2 implies the formula of ionic substance is $A B_{2}$

The formula mass of the substance $= 138 + (19 \times 2) = 176 a m u$

Ionic substances should not be called as ‘compounds’ as they do not contain discrete molecules. Mass of such a substance has to be referred as ‘Formula Mass’ and not as ‘Molecular Mass’

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