Q17 of 40 Page 1

Give reasons:

Transition metals show variable oxidation states.

Transition metals show variable oxidation states because of the participations of ns and (n-1)d electrons in bonding. Lower oxidation state os exhibited when the ns electrons take part in bonding. Higher oxidation states are exhibited when the (n-1)d electrons take part in bonding.


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16

Calculate e.m.f of the following cell at 298 K:


Given:


 17

Give reasons:

Mn shows the highest oxidation state of +7 with oxygen but with fluorine it shows the highest oxidation state of +4

 17

Give reasons:

Actinoids show irregularities in their electronic configurations.

 18

Write the main product(s) in each of the following reactions:

(i)


(ii)


(iii)