identify

W is wrong..X is rite...

but can u explain how ?

sorry...W is Ag !!!
......;)
edited !!!

AgNO₃ ---(Heat)--> Ag + NO₂ + O₂
(Always remember tht Ag/Hg being smwhat less reactive wan't 2 pptate. out if they get a chance i.e. heated/decomposition)

NO₂ disproportionates in water... NO₂ + H₂O ----> HONO + HNO₃

In the 3rd reac.ⁿ, "N" is bein' reduced ,so Ag shud get oxidised..

Further AgNO₃ reacts with Hypo 2 gve a white ppt. of Ag₂S₂O₃ (simply ion exchange b/w Ag & Na) ...which on standing turns blacks due to decomposition into Ag₂S & SO₃

thx....gr88 explaination..jsut what i wanted..[1]

any reason why NO2 and not something else????

2 Possibilties of "N" reduction frm NO3^- - NO or NO₂...
But, Even if NO were 2b released, it wud have used up the O₂ to get oxidised a little to NO₂...as is the case when v test fr Nitrites...

Ans 1) A is 2 Na FeO₂ (Sodium ferrite)

No tushar

oops yes..u r rite...i checked ans to wrong ques...sorry for trouble...

btw can u explain the answer a bit more ???

Fe₂O₃ is largely basic. The ignited form is difficult to dissolve in acids. However the freshly precipitated hydrous form dissolves in acids, giving the very pale violet [Fe (H₂O) ₆ ] ³⁺ ion, and in conc NaOH , forming [Fe (OH) ₆] ^{3 -} . This shows that the oxide is slightly amphoteric. Fusion with LiOH, NaO or Na₂ CO₃ gives Li FeO₂ or NaFeO₂.

Fe₂O₃ + Na₂CO₃ → 2 NaFeO₂ + CO₂

At one time, this was used in the obselete Lowig Process for manufacturing Caustic Soda.

Fe₂O₃ + Na₂CO₃ → 2 NaFeO₂ + CO₂
2 NaFeO₂ +H₂O → 2 NaOH + Fe ₂O₃