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Number of positively charged sols amont ...

Number of positively charged sols amont the following is `Al_(2)O_(3).xH_(2)O,CrO_(3).xH_(2)O,As_(2)S_(3),CdS,` starch, `TiO_(2)`, Haemoglobin, `Fe_(2)O_(3).xH_(2)O,` Gold eosin

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The correct Answer is:
5
`Al_(2)O_(3).xH_(2)O,CrO_(3).xH_(2)O,TiO_(2)`. Haemoglibin
`Fe_(2)O_(3).xH_(2)O`
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