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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bn070

Select all hydrates, identified by name, whose formula unit contains exactly 9 oxygen atoms. Take each name literally and deduce the formula from it, whether or not that hydrate is the common one.

  1. Acopper(II) sulfate pentahydrate
  2. Bsodium thiosulfate pentahydrate
  3. Ciron(II) sulfate pentahydrate
  4. Dmagnesium sulfate heptahydrate

Answer: A, C

Sulfate has 4 O, so has and has 9. has and has .
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