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Q.

Which of the following is/are positively charged colloid

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a

Al(OH)3

b

SnO2

c

Haemoglobin

d

Gold

answer is A.

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Detailed Solution

Al(OH)3,SnO2 and haemoglobin are +vely charged due to adsorption of +ve charge( d) Gold is -vely charged colloid due to capture of electrons in Bredig's Arc method.
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