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What are the sign of the entropy change ...

What are the sign of the entropy change (+ or -) in the following:
I : A liquid crystallises into a solid
II: Temperature of a crystalline solid is raised from 0K to 115K
III: `2NaHCO_(3(g)) rarr Na_(2)CO_(3(g)) + CO_(2(g)) + H_(2)O_((g))`
IV : `H_(2(g)) rarr 2H_((g))`

A

`{:(I,II,III,IV),(-,+,+,+):}`

B

`{:(I,II,III,IV),(-,-,-,+):}`

C

`{:(I,II,III,IV),(-,-,-,+):}`

D

`{:(I,II,III,IV),(+,-,-,-):}`

Text Solution

Verified by Experts

The correct Answer is:
A
`l rarr s, Delta S lt 0`
`T uarr, Delta S gt 0`
`s rarr g, Delta S gt 0`, dissociation, `Delta S gt 0`
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