Change set
Pick exam & year, then Go.
Question map
Not attempted
Correct
Incorrect
★
Bookmarked
Loading…
Q26
(CDS-I/2026)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Which one among the following pairs of compound and chemical formula is not correctly matched?
Result
Your answer:
—
·
Correct:
C
Explanation
The pair Baking powder : NaHCl2 is incorrectly matched. Baking powder is a mixture of Baking Soda (Sodium Bicarbonate, NaHCO3) and a mild edible acid like tartaric acid. The formula NaHCl2 does not represent any standard chemical compound used in this context.
- Bleaching powder (CaOCl2): Also known as calcium oxychloride, it is produced by the action of chlorine on dry slaked lime [Ca(OH)2].
- Soda ash (Na2CO3): This is the chemical name for anhydrous sodium carbonate, commonly used in glass and soap manufacturing.
- Plaster of Paris (2CaSO4.H2O): Chemically known as calcium sulphate hemihydrate (CaSO4.1/2H2O). The formula 2CaSO4.H2O is an equivalent representation indicating that two units of calcium sulphate share one molecule of water of crystallization.
How others answered
Each bar shows the % of students who chose that option.
Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
66%
got it right
✓ Thank you! We'll review this.