Question

plz solve Q1 Q2 Q3 answer

Answer 1

Ans1: due to inert pair effect lower os compound is more stable than the higher os compound. this effect is applicable for the last members of boron, carbon, and nitrogen family. hence PbCl4 (os of Pb is +4 )acts as a reducing agent ie oxidises itself to form Pb+2
Ans 2: aqueous solution of borax gives H3BO3 and NaOh(strong base) .hence colour of litmus paper changes