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Question : 54 of 180
Marks:
+1 ,
-0
Solution:
Zinc gives
H 2 gas with dil.
H 2 S O 4 / H C l but not with
H N O 3 because in
H N O 3 , N O 3 − ion is reduced and gives
N H 4 + , N 2 O , N O and
N O 2 (based upon the concentration of
H N O 3 )
[ Z n + 2 H N O 3 → Z n ( N O 3 ) 2 + 2 H ] × 4
H N O 3 + 8 H → N H 3 + 3 H 2 O N H 3 + H N O 3 → N H 4 N O 3 4 Z n + 10 H N O 3 → 4 Z n ( N O 3 ) 2 + N H 4 N O 3 + 3 H 2 O
Zn is on the top position of hydrogen in elctro-chemical series.So Zn displaces
H 2 from dilute
H 2 S O 4 and
H C l with liberation of
H 2 © examsiri.com
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