Give balanced equations for decomposition of ferrous sulphate and lead nitrate. Mention atleast 3 observations for each.

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Solution

$2 F e S {O_{4}}_{(s)} \overset{∆}{\to} F e_{2} O_{3}_{(s)} + S O_{2}_{(g)} + S O_{3}_{(g)} O b s e r v a t i o n 1 . W h e n f e r r o u s u l p h a t e i s h e a t e d i t r e l e a s e s s u l p h u r d i o x i d e a n d w h i t e f u m e s o f s u l p h u r t r i o x i d e, 2 . I t f o r m s r e d d i s h b r o w n i r o n (I I I) o x i d e c a l l e d r u s t 3 . T h i s r e a c t i o n i s a l s o r e d o x r e a c t i o n a s o x i d a t i o n s t a t e o f F e a n d S c h a n g e s . 2 P b (N O_{3})_{2_{(s)}} \overset{∆}{\to} 2 P b O_{(s)} + 4 N O_{2 (g)} + O_{2 (g)} O b s e r v a t i o n 1 . O n h e a t i n g l e a d n i t r a t e b r o w n c o l o u r g a s N O_{2} i s r e l e a s e d . 2 . R e s i d u e o f d u l l w h i t e P b O i s f o r m e d 3 . T h i s r e a c t i o n i s a n e n d o t h e r m i c r e a c t i o n .$

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K_{2} C r_{2} O_{7}

(a) Explain with the help of a balanced equation, the brown ring test for nitric acid.

(b) Why is freshly pepared ferrous sulphate solution used for testing the nitrate radical in the brown ring test ?

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