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Question
CDS - 2026
General Science

Which one among the following pairs of compound and chemical formula is not correctly matched ?

This question was previously asked in
CDS 1 2026 Maths Question Paper (12-Apr-2026)
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The correct answer is

Baking powder : \(NaHCl_2\)

Compound Formula Mismatch Identification

The question asks to identify the pair consisting of a chemical compound and its formula that is incorrectly matched.

Chemical Formula Verification

  • Bleaching powder: The formula \(CaOCl_2\) correctly represents bleaching powder (calcium oxychloride).
  • Soda ash: The formula \(Na_2CO_3\) correctly represents soda ash (anhydrous sodium carbonate).
  • Baking powder: The primary active ingredient in baking powder is sodium bicarbonate, which has the chemical formula \(NaHCO_3\). The formula \(NaHCl_2\) provided in the option is incorrect.
  • Plaster of Paris: Plaster of Paris is calcium sulfate hemihydrate. The formula \(2CaSO_4 \cdot H_2O\) is an equivalent way of writing \(CaSO_4 \cdot \frac{1}{2}H_2O\), which is correct.

Conclusion on Mismatch

The pair "Baking powder : \(NaHCl_2\)" is not correctly matched. The standard chemical formula for baking powder's main component is \(NaHCO_3\). This makes option 3 the pair that is not correctly matched.

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