Due to paucity of time it would not be possible for us to provide the answers to all your queries. We are providing solutions to some your good queries. Try solving rest of the questions yourself and if you face any difficulty then do get back to us.
A-1) Element X = Al ( aluminum)
Oxide of Al - Al2O3
Chloride of Al - AlCl3
A-9) Number of molecules in 0.25 moles of oxygen = 0.25 * 6.023*1023 = 1.505*1023 particles.
A-21) Out of NaOH, NaCl, Na 2 O, NaNO 3 , compound having polyatomic ion is NaNO 3 .
Urvashi Yadav(MeritNation Expert)on 2/1/13
This conversation is already closed by Expert