Why is the $pH$ of an aqueous solution of copper sulphate less than $7$?

  • A
    It is a salt of a strong acid and a weak base.
  • B
    It is a salt of a weak acid and a weak base.
  • C
    It is a salt of a strong acid and a strong base.
  • D
    It is a salt of a weak acid and a strong base.

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