Iron sulphide is heated in air to form $A$ an oxide of sulphur. $A$ is dissolved in water to give an acid.…

Iron sulphide is heated in air to form $A$ an oxide of sulphur. $A$ is dissolved in water to give an acid. The basicity of this acid is
  1. $2$
  2. $3$
  3. $1$
  4. zero

Asked in: AP EAMCET 2002

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