The reaction sodium carbonate with excess calcium hydroxide produces:

Caustic soda

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Caustic potash

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Baryta

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Slaked lime

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Solution

The correct option is A Caustic soda
The reaction sodium carbonate with calcium hydroxide produces sodium hydroxide (NaOH), it involves heating of 10% solution of $N a_{2} C O_{3}$ with a little excess of milk of lime $C a (O H)_{2}$
$N a_{2} C O_{3} + C a (O H)_{2} \to C a C O_{3} ↓ + 2 N a O H$

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