In going from solid to liquid the system
first absorbs and then releases energy
absorbs energy
releases energy
neither absorbs nor releases energy
System absorbs energy
When a mixture of iron powder and sulphur powder is heated strongly to form iron sulphide, then heat energy is :
(a) released (b) first absorbed and then released
(c) absorbed (d) neither absorbed nor released
For the processes K+(g) I⟶ K(g) II⟶K−(g)
When water at 0∘C freezes to form ice at the same temperature of 0∘C, then it :
(a) absorbs some heat (b) releases some heat
(c) neither absorbs nor releases heat (d) absorbs exactly 3.34×105 J/Kg of heat