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Answer: Option (b) is the correct answer.

Explanation:

When we say that an equation is balanced then it means there are equal number of atoms on both reactant and product side.

For example, \(Ca_{3}(PO_{4})_{2} + H_{2}SO_{4} \rightarrow CaSO_{4} + H_{3}PO_{4}\)

Number of atoms on reactant side are as follows.

  • Ca = 3
  • \(PO_{4}\) = 2
  • H = 2
  • \(SO_{4}\) = 1

Number of atoms on product side are as follows.

  • Ca = 1
  • \(PO_{4}\) = 1
  • H = 3
  • \(SO_{4}\) = 1

Therefore, to balance this equation we multiply \(H_{2}SO_{4}\) by 3 on reactant side and multiply \(CaSO_{4}\) by 3 and \(H_{3}PO_{4}\) by 2 on product side.

Hence, the balanced equation will be as follows.

     \(Ca_{3}(PO_{4})_{2} + 3H_{2}SO_{4} \rightarrow 3CaSO_{4} + 2H_{3}PO_{4}\)

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