Question

For the reaction `2Cl(g)rarrCl_(2)(g)`, the signs of `DeltaH ` and `DeltaS` respectively are
A. `+,-`
B. `+,+`
C. `-,-`
D. `-,+`

Answer 1

Correct Answer - C
When atoms combine to form molecule,energy is released, i.e., `DeltaH ` is `-ve`. As two moles combine to give one mol, randomness ( entropy) decreases,i.e., `eltaS` is `-ve`.