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Q345) The catalytic activity of the transition metals and their compound is ascribed to [ kerala CEE 2002]




SOLUTION


Answer: (d)


Q346) Which of the following is obtained when Fe reacts with dil HNO3




SOLUTION

4Fe +10HNO3 → 4Fe(NO3 )2 + NH4NO3 + 3H2O
Answer: (d)


Q347) During extraction of silver, which of the following is formed? [ MP PET 2002]



SOLUTION

2Ag2S + 8NaCN + O2 + 2H2O → 4Na[Ag(CN)2] + 4NaOH + 2S
Answer:(a)



Q348) A metallic oxide which imparts purple colour to potter is



SOLUTION


Answer: (a)


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