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Q.

Predict the correct sign of ∆S  for following reaction by choosing the option

I. C(s)+H2O(l)→CO(g)+H2(g)

II. N2(g,10atm)→N2(g.1atm)

III. Hard boiling of an egg

IV. Desalination of water

Choose the correct option.

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a

I- −,II- +,III- −,IV- −

b

I- −,II- +,III- +,IV- +

c

I- +,II- +,III- +,IV- −

d

I- +,II- −,III- −,IV- +

answer is A.

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Detailed Solution

I .C(s)+H2O(l)→CO(g)+H2(g)

Δn=nproducts−nreac tants

Δn=2−1=1

Here, number of moles of product increases
II. Volume increases
III. De - naturation increases

IV. No. of particles decreases

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