Metal used in the detection of nitrogen in organic compounds is:

C s

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K

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N a

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L i

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Solution

The correct option is B $N a$
For qualitative detection of nitrogen, sodium fusing extract is boiled with ferrous sulphate and acidified with concentrated sulfuric acid.

In Kjeldahl's method, sodium (in the form of sodium hydroxide) is used in the quantitative detection of nitrogen present in organic compounds.

Hence, the correct option is $C$

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The correct order of reactivity of alkalimetals towards $H_{2}$ is

C s, N a, L i, K, R b

L i^{+} < N a^{+} < K^{+} < R b^{+} < C s^{+}

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