Chemical Reactions and Equations Test

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Chemical Reactions and Equations Test - 36

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Weekly Quiz Competition

Question 1
1 / -0

Heating of ferrous sulphate crystals results in change in the colour of the crystals. This reaction is an example of:

A
Decomposition reaction

B
Combination reaction

C
Displacement reaction

D
Cannot be predicted

Solution

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.

$$2FeSO_4 \xrightarrow{Heat} Fe_2O_3 + SO_2 + SO_3$$
Question 2
1 / -0

$$2Pb \left( NO_{ 3 } \right)_{{2}{(s)}}$$ $$\overset{Heat}\longrightarrow$$ $$2 P b O_{( s )} + 4 N O _ {{ 2 }{(g)}} \uparrow + \ O _ {{ 2 }{(g)}} $$ , The above reaction is ...................

A
combination

B
decomposition

C
sublimation

D
both $$B$$ and $$C$$

Solution

In a decomposition reaction, one simple compound decomposes or breaks down into two or more substances.
Here, $$Pb(NO_3)_2$$ breaks down into $$PbO, NO_2$$ and $$O2$$ when a sufficient amount of heat is supplied to it.

Option $$B$$ is correct
Question 3
1 / -0

Which of the following reactions are possible?
i) $$Mg+CuSO_4 \rightarrow MgSO_4+Cu$$
ii) $$Ca+MgSO_4 \rightarrow CaSO_4+Mg$$
iii) $$Cu+ZnSO_4\rightarrow CuSO_4+Zn$$
iv) $$Fe+MgSO_4 \rightarrow FeSO_4+Mg$$

A
iii and iv only

B
i and iv only

C
ii and iii only

D
i and ii only

Solution

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.
Question 4
1 / -0

$$Zn(s)+PbCl_2(aq)\rightarrow Pb(s)+ZnCl_2(aq)$$
Find out which of the above component is getting oxidized.

A
Zn

B
Pb

C
Cl

D
$$Zn^+$$

Solution
Question 5
1 / -0

$$ TiCl_4 +2Mg \rightarrow Ti +2MgCl_2 $$. Identify the reaction.

A
Decomposition reaction

B
Combustion

C
Combination reaction

D
Displacement reaction

Solution

This is a displacement reaction as one element is displacing another element in a reactant to give new products.
Question 6
1 / -0

Which of these is a combination reaction?

A
$$ 2CO_{(g)} + O_{2(g)} \rightarrow 2CO_{2(g)} $$

B
$$Mg_{(s)} + CuSO_{4(aq)} \rightarrow Cu_{(s)} + MgSO_{4(aq)} $$

C
$$ 2AgNO_{3(aq)} + Cu_{(s)} \rightarrow 2Ag_{(s)} + Cu(NO_3)_{2(aq)} $$

D
$$2HgO_{(s)} \rightarrow 2Hg_{(l)} + O_{2(g)} $$

E
All of these
Solution
- 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.
Question 7
1 / -0

Which of the following reaction is not exothermic?

A
$$CaCO_3 \rightarrow CaO + CO_2$$

B
$$Fe + S \rightarrow FeS$$

C
$$NaOH + HCl \rightarrow NaCl + H_2O$$

D
$$CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$$

Solution
Question 8
1 / -0

Observe the following reaction.
$$ NH_{3(g)} + HCl_{(g)} \rightarrow NH_4Cl_{(s) }$$
which of the following is a type of above reaction?

A
combination reaction

B
decomposition reaction

C
double displacement reaction

D
substitution reaction
Question 9
1 / -0

During decomposition of an activated complex:

A
Energy is always released

B
energy is always absorbed

C
Energy does not chnage

D
None of the above

Solution

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.
Question 10
1 / -0

Which of the following is not a disproportionation reaction?
$$I. NH_4NO_3 \xrightarrow{A} N_2O+H_2O $$
$$ II. P_4 \xrightarrow {A} PH_3 +HPO_2$$
$$ III. PCl_5 \xrightarrow {A} PCl_3 +Cl_2 $$
$$IV. IO^{\ominus}_3 \rightarrow I_2 $$

A
$$ I, II $$

B
$$ I, III , IV $$

C
$$ II, V $$

D
$$ I , III $$

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Re-Attempt Weekly Quiz Competition

Chemical Reactions and Equations Test - 36

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Chemical Reactions and Equations Test - 36

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SHARING IS CARING

Question 1

Decomposition reaction

Combination reaction

Displacement reaction

Cannot be predicted

Solution

Question 2

combination

decomposition

sublimation

both $$B$$ and $$C$$

Solution

Question 3

iii and iv only

i and iv only

ii and iii only

i and ii only

Solution

Question 4

Zn

Pb

Cl

$$Zn^+$$

Solution

Question 5

Decomposition reaction

Combustion

Combination reaction

Displacement reaction

Solution

Question 6

$$ 2CO_{(g)} + O_{2(g)} \rightarrow 2CO_{2(g)} $$

$$Mg_{(s)} + CuSO_{4(aq)} \rightarrow Cu_{(s)} + MgSO_{4(aq)} $$

$$ 2AgNO_{3(aq)} + Cu_{(s)} \rightarrow 2Ag_{(s)} + Cu(NO_3)_{2(aq)} $$

$$2HgO_{(s)} \rightarrow 2Hg_{(l)} + O_{2(g)} $$

All of these

Solution

Question 7

$$CaCO_3 \rightarrow CaO + CO_2$$

$$Fe + S \rightarrow FeS$$

$$NaOH + HCl \rightarrow NaCl + H_2O$$

$$CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$$

Solution

Question 8

combination reaction

decomposition reaction

double displacement reaction

substitution reaction

Question 9

Energy is always released

energy is always absorbed

Energy does not chnage

None of the above

Solution

Question 10

$$ I, II $$

$$ I, III , IV $$

$$ II, V $$

$$ I , III $$

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