1cmon kamal bhaiya and others help!!
6 Answers
1b) (?) did by elimination of other options as.. Pb+4 will try for Pb+2 (inert pair) so it will try to oxsidise HNO3 but N+5 .. so no chance of further oxidation of N+5....so only option is b)
11chk this link out--
http://targetiit.com/iit_jee_forum/posts/doubt_8257.html
according to the results over there PbO2 wont react only.
1i think PbO2 would not react as Pb is in +4 state and it can not further oxidise eureka conc./dil. terms were meaningful when u r dealing with Pb/Pb2+ salt only