42) I thought of C as the ans becz I knew that alums were used in water purification through coagulation
Q1 peptization is
a) evaporation of dispersed med
b)precipiation of dispered phase
c)disintegration of dipersed phase
d)combined effect of dispersion medium on dispersed phase
Q2 Colloidal particles of water are coagulated effectively using
a)NaCl
b)(NH4)2SO4
c)alum
d)gold chloride
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13 Answers
24ans1 wrong..this ques has confused me too...
ans2 is rite..but plz tell how ??
4
1Q.1) i think a bit differently.
Actually, peptization is the dispersion of the precipitated material into colloidal solution. So, it involves first adsorption of the suitable ions and electrically charged particles then split frm precipitate as colloidal particles.
thus , its c) disintegration of the dispersed phase.
1Actually , on the whole , here particles of precipitate split as colloidal particles.
24ok......
found this definition from ncert ..
it is process of converting a ppt .into colloidal sol..
106arey alum is used for catalysing sedimentation naa in those water purification plants...
19i know just one thing, which i had studied long ago in arihant !
alum is used for the effective coagulation of colloidal particles !
