The molecular mass of a salt of oxy acid of chlorine of a divalent metal which contains more number of oxygen atoms than its corresponding '-ic' acid is 239g/mole. What is the atomic mass of the metal?
A
24
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B
39
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C
40
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D
30
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Solution
The correct option is D 40 The formula of the salt with molecular weight 239 is Ca(ClO4)2 and thus the divalent metal is calcium with atomic weight 40.