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KEAM 2021 Physics and Chemistry Solved Paper
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© examsnet.com
Question : 108
Total: 120
When zinc metal is reacted with aqueous sodium hydroxide, the products formed are
zinc hydroxide ánd oxygen only
sodium zincate and oxygen only
sodium zincate, hydrogen and oxygen
sodium zincate and hydrogen only
sodium zincate and hydrogen oxide only
Validate
Solution:
Zinc metal reacts with sodium hydroxide and water, then sodium zincate and hydrogen gas are formed.
Z
n
(
s
)
+
2
N
a
O
H
(
a
q
)
+
2
H
2
O
(
l
)
⟶
N
a
2
Z
n
(
O
H
)
4
(
a
q
)
Sodium zincate
+
H
2
(
g
)
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