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Byju's Answer
Standard VIII
Chemistry
Reactions Due to Electricity
Identify the ...
Question
Identify the examples of ions.
A
Cl
−
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B
Na
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C
Mg
+
2
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D
Cu
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E
HCO
−
3
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F
Fe
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G
Fe
+
2
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H
Cu
+
2
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I
Zn
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Similar questions
Q.
Identify the substances oxidised, reduced, oxidising agent and reducing agent for the given reaction-
H
C
H
O
(
1
)
+
2
C
u
2
+
(
a
q
)
+
5
O
H
−
(
a
q
)
→
C
u
2
O
(
s
)
+
H
C
O
O
−
(
a
q
)
+
3
H
2
O
(
l
)
Q.
Consider following reactions:
(a)
2
Z
n
S
+
3
O
2
→
2
Z
n
O
+
2
S
O
2
Z
n
O
+
C
→
Z
n
+
C
O
(b)
2
Z
n
S
+
C
→
2
Z
n
+
C
S
2
Which reaction has more positive value of
Δ
G
?
1. A
2. B
3. A and B are same
4. None
Q.
IDENTIFY THE TYPE OF REACTION OF THE FOLLWING
1)ZNCO3+2HCL=ZNCL2+H2CO3
2)2NABR+CL=2ANCL+BR
3)2CUO=2CU+O
Q.
Which of the following equations are examples of roasting of the respective metal ore?
(i)
CaCO
3
(s)
→
CaO (s)
+
CO
2
(g)
(ii)
2
Al(OH)
3
(s)
→
Al
2
O
3
(s)
+
3H
2
O (l)
(iii)
2
CuS(s)
+
2
O
2
(g)
→
2
Cu(s)
+
2SO
2
(g)
Q.
Identify the oxidising agent and the reducing agent in the following redox reaction:
7
C
N
−
+
2
O
H
−
+
2
C
u
(
N
H
3
)
2
+
4
⟶
2
C
u
(
C
N
)
2
−
3
+
8
N
H
3
+
C
N
O
−
+
H
2
O
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