BPSC – Combined Competitive Examination · প্রশ্ন 108
Which of the following are exothermic processes? i. Evaporation of water ii. Dilution of an acid (H₂SO₄) iii. Reaction of water with quicklime iv. Sublimation of camphor
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (B) ii and iii
ব্যাখ্যা
Evaporation and sublimation absorb heat; diluting H₂SO₄ and CaO + H₂O release heat.
- (A) ভুল
Wrong: sublimation absorbs heat.
- (B) সঠিক
Correct: diluting acid and slaking lime both release heat.
- (C) ভুল
Wrong: both are endothermic.
- (D) ভুল
Wrong: evaporation is endothermic.