The charge on a cation ' M ' is +2 and anion ' A ' is -3. The compound formed has the formula

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$M_{3} A_{2}$

$M_{2} A$

$M_{2} A_{3}$

${MA}_{2}$

answer is B.

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Detailed Solution

According to the criss-cross method used for writing the chemical formula for the ionic compound, the charge on a cation 'M' is +2 and anion 'A' is –3.

Hence the compound is $M_{3} A_{2}$ .

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