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CBSE Questions for Class 10 Chemistry Chemical Reactions And Equations Quiz 7 - MCQExams.com
CBSE
Class 10 Chemistry
Chemical Reactions And Equations
Quiz 7
Take 5 mL of sodium sulphate solution in a test tube and 5 mL of barium chloride solution in another test tube. Mix the two solutions slowly and leave the test tube undisturbed for some time. A white precipitate is formed after some time.
Which of the following statements is correct about the above reaction?
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0%
It is a double displacement reaction since exchange of ions occurs between the two reactants.
0%
It is a combination reaction since barium ions combine with sulphate ions to give barium sulphate.
0%
It is a displacement reaction since chloride ions are replaced by sulphate ions.
0%
It is a neutralisation reaction since an acid reacts with alkali to give a salt.
2
P
b
(
N
O
3
)
2
(
s
)
H
e
a
t
⟶
2
P
b
O
(
s
)
+
4
N
O
2
(
g
)
↑
+
O
2
(
g
)
, The above reaction is ...................
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0%
combination
0%
decomposition
0%
sublimation
0%
both
B
and
C
Explanation
In a decomposition reaction, one simple compound decomposes or breaks down into two or more substances.
Here,
P
b
(
N
O
3
)
2
breaks down into
P
b
O
,
N
O
2
and
O
2
when a sufficient amount of heat is supplied to it.
Option
B
is correct
Which of the following reactions are possible?
i)
M
g
+
C
u
S
O
4
→
M
g
S
O
4
+
C
u
ii)
C
a
+
M
g
S
O
4
→
C
a
S
O
4
+
M
g
iii)
C
u
+
Z
n
S
O
4
→
C
u
S
O
4
+
Z
n
iv)
F
e
+
M
g
S
O
4
→
F
e
S
O
4
+
M
g
Report Question
0%
iii and iv only
0%
i and iv only
0%
ii and iii only
0%
i and ii only
Explanation
More reactive metal displaces less reactive metal from their salt solution. Reactivity order:
i. Mg > Cu
ii. Ca > Mg
iii. Zn > Cu
iv. Mg > Fe
So, according to reactivity order only i and ii reaction are possible.
Which among the following processes are exothermic reactions?
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0%
A match stick burns
0%
Ice melts
0%
Molten metal solidifies
0%
Sodium metal reacts with water
0%
Rubbing alcohol evaporates
Z
n
(
s
)
+
P
b
C
l
2
(
a
q
)
→
P
b
(
s
)
+
Z
n
C
l
2
(
a
q
)
Find out which of the above component is getting oxidized.
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0%
Zn
0%
Pb
0%
Cl
0%
Z
n
+
Heating of ferrous sulphate crystals results in change in the colour of the crystals. This reaction is an example of:
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0%
Decomposition reaction
0%
Combination reaction
0%
Displacement reaction
0%
Cannot be predicted
Explanation
Ferrous sulphate crystals are green in colour. When they are heated, they lose the water of crystallisation and their colour changes to white. On further heating, ferric oxide is formed along with sulphur dioxide and sulphur trioxide. The colour of the product is very different from the initial crystals. Since in this reaction a single reactant breaks down into simpler products, it is a decomposition reaction.
2
F
e
S
O
4
H
e
a
t
→
F
e
2
O
3
+
S
O
2
+
S
O
3
Observe the reaction:
C
a
C
O
3
(
s
)
+
2
N
a
O
H
(
a
q
)
→
N
a
2
C
O
3
(
a
q
)
+
C
a
(
O
H
)
2
(
a
q
)
Which of the following is a type of above reaction?
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0%
Displacement reaction
0%
Double displacement reaction
0%
Combination reaction
0%
Decomposition reaction
Explanation
The given reaction is a double displacement reaction because there is an exchange of ions between the two reactants.
C
a
2
+
from
C
a
C
O
3
is getting exchanged with
N
a
+
from
N
a
O
H
to form two new products.
The conversion of limestone to quicklime in presence of heat is a _______ reaction.
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0%
decomposition
0%
displacement
0%
combination
0%
disproportionation
Explanation
Limestone is calcium carbonate. It decomposes in presence of heat to give
calcium oxide (quicklime) and carbon dioxide. This is a decomposition reaction.
C
a
C
O
3
H
e
a
t
→
C
a
O
+
C
O
2
Identify the correct option for the following reaction:
2
K
C
l
O
3
(
s
)
⟶
2
K
C
l
(
s
)
+
3
O
2
(
g
)
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0%
Endothermic & Double displacement reaction
0%
Endothermic & Decomposition reaction
0%
Endothermic & Reversible reaction
0%
Endothermic & Precipitation reaction
Explanation
It is a decomposition reaction as the potassium chlorate compound breaks to form potassium chloride and oxygen. This reaction requires heat as a source of energy to break down the compound so it is endothermic in nature.
Hence, option B is correct.
During decomposition of an activated complex:
Report Question
0%
Energy is always released
0%
energy is always absorbed
0%
Energy does not chnage
0%
None of the above
Explanation
The energy required to form an intermediate is called as activation energy and the complex formed is called as activated complex.
Some energy is released when the complex decomposes to form a product. The entire concentration of an activated complex does not convert into product, but some of the concentration can convert into reactant as well.
Hence, option
A
is the correct answer.
Which of the following is not a disproportionation reaction?
I
.
N
H
4
N
O
3
A
→
N
2
O
+
H
2
O
I
I
.
P
4
A
→
P
H
3
+
H
P
O
2
I
I
I
.
P
C
l
5
A
→
P
C
l
3
+
C
l
2
I
V
.
I
O
⊖
3
→
I
2
Report Question
0%
I
,
I
I
0%
I
,
I
I
I
,
I
V
0%
I
I
,
V
0%
I
,
I
I
I
Observe the following reaction.
N
H
3
(
g
)
+
H
C
l
(
g
)
→
N
H
4
C
l
(
s
)
which of the following is a type of above reaction?
Report Question
0%
combination reaction
0%
decomposition reaction
0%
double displacement reaction
0%
substitution reaction
T
i
C
l
4
+
2
M
g
→
T
i
+
2
M
g
C
l
2
. Identify the reaction.
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0%
Decomposition reaction
0%
Combustion
0%
Combination reaction
0%
Displacement reaction
Explanation
This is a displacement reaction as one element is displacing another element in a reactant to give new products.
Which of these is a combination reaction?
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0%
2
C
O
(
g
)
+
O
2
(
g
)
→
2
C
O
2
(
g
)
0%
M
g
(
s
)
+
C
u
S
O
4
(
a
q
)
→
C
u
(
s
)
+
M
g
S
O
4
(
a
q
)
0%
2
A
g
N
O
3
(
a
q
)
+
C
u
(
s
)
→
2
A
g
(
s
)
+
C
u
(
N
O
3
)
2
(
a
q
)
0%
2
H
g
O
(
s
)
→
2
H
g
(
l
)
+
O
2
(
g
)
0%
All of these
0%
None of these
Explanation
Option A is a combination reaction as two reactants are combining to give one product.
Options B and C are displacement reactions as one element is replacing another element in the reactants to give new products.
Option D is a decomposition reaction as one substance is breaking down into simpler products.
Which of the following reaction is not exothermic?
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0%
C
a
C
O
3
→
C
a
O
+
C
O
2
0%
F
e
+
S
→
F
e
S
0%
N
a
O
H
+
H
C
l
→
N
a
C
l
+
H
2
O
0%
C
H
4
+
2
O
2
→
C
O
2
+
2
H
2
O
Which of the following reactions will be comparatively the slowest?
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0%
Decomposition of urea in presence of urease enzyme
0%
Formation of rust on iron in presence of inhibitors
0%
The combination of
N
2
and
O
2
when lightening is there in the sky
0%
The rate of reverse reaction in presence of catalyst.
Explanation
Rusting of iron is a relatively slow process.
Iron on oxidation in the presence of air and moisture forms iron oxide which is known as rust.
It is a slow process.
In the presence of inhibitors the process even slows further.
Hence, the correct option is
B
.
Which of the following is a combination reaction.
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0%
2
N
H
3
+
H
2
S
O
4
⟶
(
N
H
4
)
2
S
O
4
0%
N
H
3
+
H
2
O
→
N
H
4
O
H
0%
2
H
2
+
O
2
⟶
2
H
2
O
0%
All the above
Explanation
A combination reaction is a reaction in which two or more reactants combine to form one product.
All the above reactions are combination reactions as two reactants combine to form one product.
Correct option is (D).
Which methods are suitable for preparing both zinc sulfate and copper(II) sulfate?
(1)Reacting the metal oxide with warm dilute aqueous sulfuric acid
(2) Reacting the metal with dilute aqueous sulfuric acid
(3)Reacting the metal carbonate with dilute aqueous sulfuric acid
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0%
1,2 and 3
0%
1 and 2 only
0%
1 and 3 only
0%
2 and 3 only
Explanation
double displacement reaction takes place mostly in an aqueous solution wherein the ion precipice and exchange of ions take place. in this all reaction highly activate metal ion replaces lower activate ion.
hence answer is option A
Process of addition of oxygen is called oxidation.
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0%
True
0%
False
Explanation
The process of addition of oxygen to a substance is called oxidation.
Example:
C
+
O
2
→
C
O
2
2
M
g
+
O
2
→
2
M
g
O
Hence, the given statement is true.
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Incorrect : 0
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