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Q9) Which of the following does not give precipitate with AgNO3 solution? [ AFMC 2006]




SOLUTION

In [Co(NH3)4Cl3] all Cl atoms are are inside the coordination sphere so they will not ionize and this compound will not give precipitate with AgNO3
Answer: (d)


Q10) In which of the following pairs both the complexes show optical isomerism [ AFMC 2009]




SOLUTION


Answer: (b)


Q11) Which of the following elements shows maximum number of different oxidation states in its compounds?



SOLUTION

Oxidation states of
Eu = +2, +3
La = +3
Gd=+3
Am = +3, +4, +5, +6

Answer:(d)



Q12) Which of the following statement is not correct[ AFMC 2011]



SOLUTION

Transition metals can combine more than one carbonyl group
Answer: (b)


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