When potassium perchlorate is heated,a gas is evolved.It can also be obtained by heating:

K C l O_{3}

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K_{2} C r_{2} O_{7}

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S O_{2}

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all of these

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Solution

The correct options are
A $K C l O_{3}$
B $K_{2} C r_{2} O_{7}$
Potassium perchlorate has chemical formula $K C l O_{4}$
$K C l O_{4} + h e a t \to K C l + 2 O_{2}$
$2 K C l O_{3} + h e a t \to 2 K C l + 3 O_{2}$
$4 K_{2} C r_{2} O_{7} + h e a t \to 4 K_{2} C r_{2} O_{4} + 2 C r_{2} O_{3} + 3 O_{2}$

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K C l O_{3}

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C l_{2} + 2 K O H \to K C l + K C l O + H_{2} O

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

4 K C l O_{3} \to K C l + 3 K C l O_{4}

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