Q. Match List-I with List-II for the composition of substances and select the correct answer using the code given below the lists. [table] List-I | List-II ; (A) Plaster of paris | (i) CaSO₄·2H₂O ; (B) Epsomite | (ii) CaSO₄·½H₂O ; (C) Kieserite | (iii) MgSO₄·7H₂O ; (D) Gypsum | (iv) MgSO₄·H₂O ; — | (v) CaSO₄ [/table]
A) A(i), B(ii), C(iii), D(iv)
B) A(iv), B(iii), C(ii), D(i)
C) A(iii), B(iv), C(i), D(ii)
D) A(ii), B(iii), C(iv), D(i)
Explanation
[Solution from source] Plaster of Paris is CaSO₄·½H₂O, epsomite is MgSO₄·7H₂O, kieserite is MgSO₄·H₂O and gypsum is CaSO₄·2H₂O. Anhydrous CaSO₄ is a distractor that matches none of them. Mixing up gypsum and plaster of Paris is the usual trap. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.