In the estimation of nitrogen, the kjeldahlised liquid is heated with:

c o n c . H N O_{3}

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c o n c . H_{2} S O_{4}

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c o n c . H C l

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c o n c . N a O H

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Solution

The correct option is C $c o n c . N a O H$
Kjeldahl's method
This method is used for estimation of nitrogen. It uses conc, sodium hydroxide for estimation of nitrogen.

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c o n c . H N O_{3}

c o n c . H C l

Phenol + c o n c . H N O_{3} + c o n c . H_{2} S O_{4} ⟶ P

H_{2} S O_{4}

c o n c . H_{2} S O_{4}

c o n c . H N O_{3}

conc. H_{2} S O_{4}

conc. H N O_{3}

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