A greenish yellow gas reacts with an alk...

A greenish yellow gas reacts with an alkali metal hydroxide to form a halite which can be used in firworks and safety matches. The gas and halides respectively are -

(1) `Br_2, KBrO_3 `

(2) `Cl_2, KCIO_3`

(3)`l_2, NalO_3`

(4) none

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