Which of the following reaction represent the decrease in entropy-I- H2Og - H2OlII- Fe2- aq - S2-aq - FeSsIII- 2SO3g - 2SO2g - O2g

The correct option is B I and II onlyThe reactions I and II only #160; represent the decrease in entropy.In reaction I, a gas is condensed into liquid. In rea ...

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Standard XII

Chemistry

Entropy

Which of the ...

Question

Which of the following reaction represent the decrease in entropy?
I. $H_{2} O (g) \to H_{2} O (l)$
II. $F e^{2 +} (a q) + S^{2 -} (a q) \to F e S (s)$
III. $2 S O_{3} (g) ⇋ 2 S O_{2} (g) + O_{2} (g)$

I only

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I and II only

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II and III only

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III only

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I, II, and III

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Solution

The correct option is B I and II only
The reactions I and II only represent the decrease in entropy.
In reaction I, a gas is condensed into liquid. In reaction II, two hydrated ions (cation and anion) combine to form a solid. As we move from gas to liquid or liquid to gas, the entropy decreases.
The reaction III represent the increase in entropy.
In reaction II, 2 moles of gaseous reactants give 3 moles of gaseous products. With increase in the number of moles of gaseous species, the entropy increases.

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Similar questions

Q. Consider an electrochemical cell in which the following reaction occurs and predict which changes will decreases the cell voltage:

F e^{2 +} (a q) + A g^{+} (a q) \to A g (s) + F e^{3 +} (a q)

(I) decreases the

[A g^{+}]

(II) increases in

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(III) increase the amount of

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Q. Complete the following chemical reactions. Classify the below into (a) hydrolysis, (b) redox and (c) hydration reactions.

(i)

P b S (s) + H_{2} O_{2} (a q) \to

(ii)

M n O_{4}^{-} (a q) + H_{2} O_{2} (a q) \to

(iii)

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(iv)

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(v)

C a_{3} N_{2} (s) + H_{2} O (l) \to

Q. Which of the following will have two stereoisomeric forms only?
(I)

[C r (N O_{2})_{3} (N H_{3})_{3}]

(II)

K_{3} [F e (C_{2} O_{4})_{3}]

(III)

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Q. Using the standard electrode potentials given in Table

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(i)

F e^{3 +} (a q)

and

I^{-} (a q)

(ii)

A g^{+} (a q)

and

C u (s)

(iii)

F e^{3 +} (a q)

and

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and

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(v)

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and

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Identify the types of reactions:-

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(ii) $N a O H (a q) + H C l (a q) \to N a C l (a q) + H_{2} O (l)$

(iii) $F e (s) + S (s) h e a t - - \to F e S (s)$

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Which of the following reaction represent the decrease in entropy?I. H2O(g)→H2O(l)II. Fe2+(aq)+S2−(aq)→FeS(s)III. 2SO3(g)⇋2SO2(g)+O2(g)

Which of the following reaction represent the decrease in entropy?
I. $H_{2} O (g) \to H_{2} O (l)$
II. $F e^{2 +} (a q) + S^{2 -} (a q) \to F e S (s)$
III. $2 S O_{3} (g) ⇋ 2 S O_{2} (g) + O_{2} (g)$