Smoke screens consist of:

fine particles of

T i O_{2}

dispersed in air by aeroplanes

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fine particles of

A g I

dispersed in air by aeroplanes

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fine particles of

A l_{2} O_{3}

dispersed in air by aeroplanes

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none of the above

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Solution

The correct option is A fine particles of $T i O_{2}$ dispersed in air by aeroplanes
Smoke screen is a cloud of smoke. It consists of fine particles of $T i O_{2}$ which were dispersed in air by aeroplanes.

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