JEE Main20231 Feb 2023Morning ShiftChemistrys Block ElementsActual
Match List I with List II (A) Slaked lime (I) NaOH (B) Dead burnt plaster (II) Ca ( OH ) 2 (C) Caustic soda (III) Na 2 CO 3 · 10 H 2 O (D) Washing soda (IV) CaSO 4 Choose the correct answer form the options given below:
Options
- A(A) - I, (B) - IV, (C) - II, (D) - III
- B(A) - III, (B) - IV, (C) - II, (D) - I
- C(A) - II, (B) - IV, (C) - I, (D) - III
- D(A) - III, (B) - II, (C) -IV, (D) -I
Correct answer
C. (A) - II, (B) - IV, (C) - I, (D) - III
Step-by-step solution
(A) Slaked lime: Calcium oxide is a white amorphous solid. It has a melting point of 2870 K. On exposure to the atmosphere, it absorbs moisture and carbon dioxide. CaO   +   H 2 O   →   Ca ( OH ) 2 CaO   +   CO 2   →   CaCO 3 The addition of a limited amount of water breaks the lump of lime. This process is called slaking of lime. (B) Dead burnt plaster: Calcium sulphate is a hemihydrate of calcium sulphate. It is obtained when gypsum, CaSO 4 . 2 H 2 O is heated a