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Q.

Aluminium (Al) magnesium (Mg) fluoride (F−) and sulphate (SO4−2) have valencies 3, 2, 1 and 2 respectively. Choose the wrong formula 

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a

Mg  F2

b

Mg2SO4

c

AlF3

d

Al2(SO4)3

answer is B.

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Detailed Solution

According to criss-cross method we can write the chemical formula.  

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Therefore, among the given all, the incorrect formula is Mg2SO4.

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Aluminium (Al) magnesium (Mg) fluoride (F−) and sulphate (SO4−2) have valencies 3, 2, 1 and 2 respectively. Choose the wrong formula