Class XII

Which among the following is the coinage metal?
  1. Chromium
  2. Copper
  3. Cobalt
  4. Nickel
Ni2+ in traces can be tested using
  1. Dimethyl glyoxime
  2. Ammonium sulphocyanide
  3. Potassium ferrocyanide
  4. Sodium nitroprusside
Which is least soluble in water?
  1. AgCl
  2. Agl
  3. AgBr
  4. Ag2S
Ferrous sulphate on heating gives
  1. SO2 and O2
  2. SO3
  3. SO2 and SO3
  4. SO2
How many electrons are involved in reduction of KMnO4 in basic medium?
  1. 1
  2. 2
  3. 3
  4. 3
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