Year: 2017
Topic: The d-and f-Block Elements
Time :
1.
It is because of inability of ns
2
electrons of the valence shell to participate in bonding that
(1). Sn
4+
is reducing while Pb
4+
is oxidizing.
(2). Sn
2+
is reducing while Pb
4+
is oxidizing.
(3). Sn
2+
is oxidizing while
4+
is reducing.
(4). Sn
2+
and Pb
2+
are both oxidising and reducing.