MCQ practice · SSC Chemistry Board questions · Chapter 11: Mineral Resources: Fossils
About X and Y:
- i. X is an aldehyde, Y an organic acid
- ii. X's 40% aqueous solution is known as formalin
- iii. Y's 4-10% aqueous solution is known as vinegar
Think it through first, then pick an option.
- a i and ii
- b i and iii
- c ii and iii
- d i, ii and iii
Answer and explanation
Correct answer: b i and iii
X is ethanal (an aldehyde) and Y ethanoic acid, whose 4-10% solution is vinegar; formalin is methanal, not X.
Why the other options are wrong
- a i and ii: ii is wrong: formalin is methanal's solution, not X's (ethanal); the answer is i and iii.
- c ii and iii: ii is wrong and i is left out: X is an aldehyde and Y an acid; the answer is i and iii.
- d i, ii and iii: ii is wrong: formalin is 40% methanal; so i and iii, not all three.
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