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Q.

FeCl3 is added to excess NaOH forms

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a

FeCl3​/Fe3+;FeCl3​/OH

b

Fe(OH)3​/H+;Fe(OH)3​/OH

c

Fe(OH)3​/Fe3+;Fe(OH)3​/OH

 

d

Fe(OH)3​/Fe3+;Fe(OH)3​/Na+

answer is B.

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Detailed Solution

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                   FeCl3​+2NaOH⟶Fe(OH)3​+3NaCl

  •  Fe(OH)exists on Fe2O3.xH2O which adsorbs OH- ions from NaOH present in excess to form Fe(OH)3​/Fe3+;Fe(OH)3​/OHso it is a -ve colloid.                             
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FeCl3 is added to excess NaOH forms