Monosilane on coming in contact with air burns with a luminous flame producing vortex rings. These rings are of:

S i O_{2}

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S i O

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S i

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H_{2} S i O_{3}

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Solution

The correct option is A $S i O_{2}$
Monosilane (eg, $S i H_{4}$ ) on coming in contact with air burns with a luminous flame producing vortex ring. These rings are of silica.
$S i H_{4} + 3 O_{2} ⟶ S i O_{2} + 2 H_{2} O$

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