A white amorphous powder emits a greenish yellow gas having a smell of chlorine. It is used to remove yellowness of white clothes in laundries. Identify the powder. Write the chemical equation involved in its preparation.

A white amorphous powder emits a greenish yellow gas having a smell of

1.	A white amorphous powder emits a greenish yellow gas having a smell of chlorine. It is used to remove yellowness of white clothes in laundries. Identify the powder. Write the chemical equation involved in its preparation.
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