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Q.

The temporary hardness of a water sample is due to compound X (the nature of hydride of central
atom of X is covalent). Boiling this sample converts X to compound Y. The sum of oxygen atoms
present in one, one molecule of X and Y are

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a

8

b

10

c

9

d

4

answer is B.

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Detailed Solution

Mg(HCO3)2 →heatMgCO3 +H2O + CO2
6 + 3 = 9

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