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Redox Reactions

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Question

you are provided with a metal a, b and a blue coloured solution C. Metal A is greyish in colour and is available as granules in pure form. Metal B on exposure to moist air developsa reddish brown coating on its surface. Both metal A and B react with solution C.
A) identify A, B and C.
B) write balanced chemical equations of A, B with solution C.
C) identify the type of reaction.
D) what other name can be given to such types of reactions?

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Solution

$A s t h e s o l u t i o n i s b l u e c o l o u r s o l u t i o n l e t u s a s s u m e i t i s c u S O_{4} . T h e m e t a l A i s g r e y c o l o u r g r a n u l e s a n d i s Z n a n d m e t a l B o n e x p o s u r e t o m o i s t a i r f o r m s r e d c o l o u r c o a t i n g c a l l e d r u s t, s o t h e m e t a l i s i r o n a . A - Z n : B - F e : C - C u S O_{4} b . Z n + C u S O_{4} \to Z n S O_{4} + C u F e + C u S O_{4} \to F e S O_{4} + C u c . T h i s r e a c t i o n i s a d i s p l a c e m e n t r e a c t i o n a s t h e m o r e r e a c t i v e m e t a l d i s p l a c e s t h e l e s s r e a c t i v e m e t a l f r o m t h e s o l u t i o n d . T h e o t h e r n a m e i s o x i d a t i o n r e a c t i o n a s i n b o t h c a s e s t h e o x i d a t i o n n u m b e r i n c r e a s e s f r o m 0 t o + 2$

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