Identify the reaction from the following in which physical and chemical changes are occurring:

H C l + N a O H \to N a C l + H_{2} O

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C a C O_{3} \to C a O + C O_{2}

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2 N_{2} O_{5} \to 4 N O_{2} + O_{2}

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C u S O_{4} .5 H_{2} O \to C u S O_{4} (s) + 5 H_{2} O (g)

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Solution

The correct option is D $C u S O_{4} .5 H_{2} O \to C u S O_{4} (s) + 5 H_{2} O (g)$
Hydrated Copper sulfate on heating gives off the water of crystallization which is the chemical change. The colour of copper sulphate changes from blue to white which is the physical change.
$C u S O_{4} .5 H_{2} O (s) \to C u S O_{4} (s) + 5 H_{2} O$

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2 {KClO}_{3} (s) \overset{∆}{\to} 2 KCl (s) + 3 O_{2} ↑

C a {CO}_{3} (s) \overset{∆}{\to} C a O (s) + {CO}_{2} ↑

2 N a C l + C a C O_{3} \to N a_{2} C O_{3} + C a C l_{2}

C a C O_{3} Δ - \to [A] + [B]

N a C l + N H_{3} + [B] + H_{2} O \to [C] + [D]

2 [C] \to N a_{2} C O_{3} + H_{2} O + [B]

Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS]

N a H C O_{3} + H C l \to

N a O H + Z n \to

N a C l + H_{2} O \to

M n O_{2} + H C l \to

C H_{4} + O_{2} \to

C a C O_{3} \to C a O + C O_{2}

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