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a
Turmeric paper test
b
Silver mirror test
c
Brown ring test
d
Lead acetate test
answer is A.
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Detailed Solution
Take turmeric paper in a solution of salt in dill HCl and moister this paper with NaOH, then reddish Brown color changing to Bluish black or Greenish black which confirms borate ion BO33âb) Silver mirror test is for distinguish aldehydesc) Brown ring test is for nitrate iond) Lead acetate test is for sulphide ion.