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A greenish yellow gas reacts with alkali metal hydroxide to form palate which can be used in fire works and safety matches, the gas and halt respectively are _____?

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$I_{2} a n d N a I O_{3}$

$C l_{2} a n d K C l O_{3}$

$C l_{2} a n d N a C l O_{4}$

$B r_{2} a n d K B r O_{3}$

answer is B.

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Detailed Solution

Chlorine gas is greenish yellow in color.

Halate ion which will be chlorate ion in this case is $C l {O_{3}}^{-}$

So option (2) is correct.

Following is the reaction with hot and conc. alkali hydroxide solution.

$C l_{2} + K O H \to K C l + K C l O_{3}$

Non metals usually disproportionate in alkali.

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