Among the following process-select the process for which - S is positive-

The correct option is B CaCO_3(s) → CaO(s)+CO_2(g) Solution: (B) #160; CaCO_3_( s )⟶CaO_( s ) + CO_2_( g ) The entropy of a system increases whenev ...

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Standard XII

Chemistry

Entropy

Among the fol...

Question

Among the following process,select the process for which $Δ S$ is positive?

N_{2} (g) + O_{2} (g) \to N O (g)

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C a C O_{3} (s) \to C a O (s) + C O_{2} (g)

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N_{2} (g) + 3 H_{2} (g) \to N H_{3} (g)

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N a N O_{2} (s) + \frac{1}{2} O_{2} (g) \to N a N O_{2} (s)

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Solution

The correct option is B $C a C O_{3} (s) \to C a O (s) + C O_{2} (g)$
Solution:- (B) ${C a C O_{3}}_{(s)} ⟶ {C a O}_{(s)} + {C O_{2}}_{(g)}$
The entropy of a system increases whenever its particles have more freedom of motion.
Thus, the entropy increases whenever you have more moles of gaseous products than of reactants and whenever you have more product particles in solution than you have of reactant particles.
Hence among the given reactions, the entropy increases in-
${C a C O_{3}}_{(s)} ⟶ {C a O}_{(s)} + {C O_{2}}_{(g)}$
Since the reactant side has no gaseous particle while the product side has $1$ gaseous particle.
Hence the entropy increases and $Δ S$ will be positive.

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Similar questions

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Q. Predict in how many of the following processes entropy change of the system is positive .
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C a C O_{3} (s) \to C a O (s) + C O_{2} (g)

(ii)

N_{2} (g) + 3 H_{2} (g) \to 2 N H_{3} (g)

(iii)

H C l (g) + N H_{3} (g) \to N H_{4} C l (s)

(iv)

2 S O_{2} (g) + O_{2} (g) \to 2 S O_{3} (g)

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Q. Take following sequential reactions :

2 H_{2} O (l) ⟶ 2 H_{2} (g) + O_{2} (g)

N_{2} (g) + 3 H_{2} (g) ⟶ 2 N H_{3} (g)

C a C O_{3} (s) ⟶ C a O (s) + C O_{2} (g)

N H_{3} (g) + C O_{2} (g) + H_{2} O (l) ⟶ N H_{4} H C O_{3} (a q)

We want to produce

0.10

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C a C O_{3} (s) \to C a O (s) + C O_{2} (g)

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Among the following process,select the process for which ΔS is positive?

Among the following process,select the process for which $Δ S$ is positive?