State which one is homogeneous or heterogeneous?
(a) $C_{D i a m o n d} ⇌ C_{g r a p h i t e}$
(b) $H_{2} O_{(s)} ⇌ H_{2} O_{(l)}$
(c) $N_{2 (g)} + 3 H_{2 (g)} ⇌ 2 N H_{3 (g)}$
(d) $M g C O_{3 (s)} ⇌ M g O_{(s)} + C O_{2 (g)}$
(e) $P C l_{3 (g)} + C l_{2 (g)} ⇌ P C l_{5 (g)}$ .

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Solution

Homogeneous systems have phase $(P) = 1$
A system with $P \geq 2$ is called heterogeneous.
Phases in a system can be determined by following the rules given below.

System Phase $(P)$ Explanation
$S + S$ $2$ No. of solid in mixture give number of phase $= 2$ i.e. $P = 2$
$S + L$ $1$ Soluble systems lead to $P = 1$
$S + L$ $2$ Insoluble systems lead to $P = 2$
$L + L$ $2$ Immiscible liquids lead to $P = 2$
$L + L$ $1$ Miscible liquids lead to $P = 1$
$G + G$ $1$ All gases in a mixture give $P = 1$

Thus given system $a$ $b$ $c$ $d$ $e$
Number of phase $2$ $2$ $1$ $3$ $1$

$∴$ (c) and (e) are Homogeneous systems.
(a), (b) and (d) are Heterogeneous systems.

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Similar questions

Δ H > Δ U

Δ H < Δ U

C (g r a p h i t e) + O_{2} (g) ⟶ C O_{2} (g)

P C l_{5} (g) ⟶ P C l_{3} (g) + C l_{2} (g)

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

N_{2} (g) + O_{2} (g) ⇌ 2 N O (g)

P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)

2 H I_{(g)} ⟶ H_{2 (g)} + I_{2 (g)}

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

2 N O_{(g)} ⟶ N_{2 (g)} + O_{2 (g)}

P C l_{5 (g)} ⟶ P C l_{3 (g)} + C l_{2 (g)}

C (s) + O_{2} (g) ⟶ C O_{2} (g)

Δ H = Δ U + R T

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

Δ H = Δ U

N H_{4} H S (s) ⟶ N H_{3} (g) + H_{2} S (g)

Δ H = Δ U - 2 R T

P C l_{5} (g) ⟶ P C l_{3} (g) + C l_{2} (g)

Δ H = Δ U + 2 R T

2 S O_{2} (g) + O_{2} (g) ⟶ 2 S O_{3} (g)

Δ H = Δ U - R T

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System	Phase $(P)$	Explanation
$S + S$	$2$	No. of solid in mixture give number of phase $= 2$ i.e. $P = 2$
$S + L$	$1$	Soluble systems lead to $P = 1$
$S + L$	$2$	Insoluble systems lead to $P = 2$
$L + L$	$2$	Immiscible liquids lead to $P = 2$
$L + L$	$1$	Miscible liquids lead to $P = 1$
$G + G$	$1$	All gases in a mixture give $P = 1$

Thus given system	$a$	$b$	$c$	$d$	$e$
Number of phase	$2$	$2$	$1$	$3$	$1$