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JEE Advanced levelSingle correct optionDifficulty 3 of 3bn146

A salt is named calcium dihydrogenphosphate monohydrate. How many hydrogen atoms are present in one formula unit (including water)?

A4
B5
C8
D6

Answer: D

Ca X^{2 +}

needs two

H X_{2} PO X_{4} X^{-}

ions:

Ca (H X_{2} PO X_{4}) X_{2} \cdot H X_{2} O

. Hydrogen:

2 \times 2 = 4

plus

2

from water

= 6

.

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