Write all your observations when the following substances are heated strongly in a Boiling tube a) Ferrous sulphate crystals b) Lead nitrate crystals

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Solution

$W h e n f e r r o u s s u l p h a t e c r y s t a l s a r e h e a t e d i t l o s e s i t s w a t e r o f c r y s t a l l i s a t i o n . T h u s c h a n g e d t o d i r t y y e l l o w a n h y d r o u s F e S O_{4} O n f u r t h e r h e a t i n g i t c h a n g e d i n t o r e d d i s h b r o w n i r o n (I I I) o x i d e r e l e a \sin g S O_{2} (f o u n d b y i t s s m e l l) a n d w h i t e f u m e s o f S O_{3} . F e S O_{4} . 7 H_{2} O \overset{∆}{\to} F e S O_{4} + 7 H_{2} O 2 F e S O_{4} \to F e_{2} O_{3} + S O_{2} + S O_{3} W h e n l e a d n i t r a t e c r y s t a l s a r e h e a t e d i t f o r m s y e l l o w r e s i d u e o f l e a d o x i d e w i t h r e d d i s h b r o w n g a s l i b e r a t i o n N O_{2} w h i c h t u r n s m o i s t b l u e l i t m u s p a p e r r e d . T h e o t h e r g a s l i b e r a t e d i s o x y g e n w h i c h r e k i n d l e s t h e b u r n i n g s p l i n t e r 2 P b (N O_{3})_{2} \to 2 P b O + 4 N O_{2} + O_{2}$

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