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NEET levelSingle correct optionDifficulty 1 of 3mc114

The molar mass of is (Cu = 63.5, S = 32, O = 16, H = 1; in )

  1. A159.5
  2. B267.5
  3. C231.5
  4. D249.5

Answer: D

M = 63.5 + 32 + 4(16) + 5(18) = 63.5 + 32 + 64 + 90 = 249.5. Anhydrous is 159.5; counting 4 or 6 water molecules gives 231.5 or 267.5.
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