Chemical Reactions and Equations Test

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Chemical Reactions and Equations Test - 34

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Question 1
1 / -0

Anhydrous iron (III) chloride is prepared by:

A
combination

B
displacement

C
decomposition

D
neutralization

Solution

Anhydrous iron (III) chloride is prepared by combination when iron is heated with dry chlorine gas.

$$ \displaystyle 2Fe+3Cl_2 \text {(dry)} \xrightarrow {\Delta} 2FeCl_3$$
Question 2
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In the reaction given below, hydrogen is getting:
$$ CuO + H_2 \rightarrow Cu + H_2O $$

A
reduced

B
oxidized

C
No change

D
None of the above

Solution

In this reaction, copper is losing oxygen and hydrogen is gaining oxygen. If a substance gains oxygen during a reaction, it is said to be oxidised. If a substance loses oxygen during a reaction, it is said to be reduced. So, in this reaction, hydrogen is getting oxidised while hydrogen is getting is reduced.
Question 3
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The color of the coating formed on the metals such as iron, silver, and copper after corrosion will be:

A
Brown, black and green in colour

B
Black, brown and green in colour

C
Brown in colour in all the metals

D
Black in colour in all the metals

Solution

When the metal is attacked by substances around it such as moisture, acids, etc. it is said to corrode and this process is called corrosion.

After corrosion, the color of:
Iron changes to $$\rightarrow$$ Reddish brown
Silver changes to $$\rightarrow$$ black
Copper changes to $$\rightarrow$$ green
Question 4
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Which of the following are combination reactions?
(i) $$2 \mathrm{KClO}_{3} + {\mathrm{Heat}}{\longrightarrow} 2 \mathrm{KCl}+3 \mathrm{O}_{2}$$
(ii) $$M g O+H_{2} O \longrightarrow M g(O H)_{2}$$
(iii) $$4 A 1+3 O_{2} \longrightarrow 2 A 1_{2} O_{3}$$
(iv) $$Z n+F e S O_{4} \longrightarrow Z n S O_{4}+F e$$

A
(i) and (iii)

B
(iii) and (iv)

C
(ii) and (iv)

D
(ii) and (iii)

Solution

In combination reaction two or more reactant combine to form single compound.
In reaction (ii) $$MgO$$ and $$H_2O$$ combines to form $$Mg(OH)_2$$ and,
In reaction (iii) $$Al$$ and $$O_2$$ combines to form $$Al_2O_3$$

Hence, these two are combination reactions. So, option $$D$$ is correct.
Question 5
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Reduction reaction is the exact opposite of

A
displacement reaction

B
decomposition reaction

C
oxidation reaction

D
none of these

Solution

Reduction reaction is the opposite (or reverse reaction) to $$\text {oxidation reaction}$$.
In reduction gain of electrons takes place while in oxidation loss of electrons.
Question 6
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In a combination how many products are formed?

A
two only

B
one or two only

C
one only

D
number cannot be specified

Solution

A reaction in which single product is formed from two or more reactants is called as combination reactions.
For example, burning of coal. $$C_{(s)} + O_{{2}{(g)}}$$ $$\longrightarrow CO_{{2}{(g)}}$$
Question 7
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Which information is not conveyed by a balanced chemical equation?

A
Physical state of reactants and products

B
Symbols and formula of all the substance involved in a particular reaction

C
Number of atoms/molecule of the reactants and products formed

D
Whether a particular reaction is actually feasible or not

Solution

A balanced chemical equation states the physical state of reactants and products. Symbols of elements and formula of compounds and numbers of atoms/molecules formed in the reaction but does not tell about the feasibility of the reaction.
Hence, option $$D$$ is correct.
Question 8
1 / -0

Fatty food become rancid due to the process of

A
Oxidation

B
Corrosion

C
Reduction

D
Hydrogenation
Question 9
1 / -0

If hydrogen is added to a compound (or an element ) in a chemical reaction, the reaction is known by which reaction?

A
Oxidation

B
Reduction

C
Decomposition

D
Redox

Solution

$$\text{Reduction reaction:}$$ A chemical reaction in which hydrogen is added or oxygen is removed from an element, molecule or compound is called a reduction reaction.
Question 10
1 / -0

Calcium oxide reacts vigorously with water to produce slaked lime.

$$CaO(s) + H_2O(l) \to Ca(OH)_2(aq)+ Heat$$

This reaction can be classified which of the following?
(A) Combination reaction
(B) Exothermic reaction
(C) Endothermic reaction
(D) Decomposition reaction

A
(A) and (C)

B
(C) and (D)

C
(A), (C) and (D)

D
(A) and (B)

Solution

$$CaO (s) + H_2O (l) \rightarrow Ca(OH)_2 (aq)$$

A combination reaction is a reaction where two or more elements or compounds combine to form a single compound. Calcium oxide combines with water to form calcium hydroxide. Hence, it is a combination reaction.

It is an exothermic reaction as a lot of heat liberate with a hissing sound during the reaction.

Hence, option D is correct.

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Chemical Reactions and Equations Test - 34

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Chemical Reactions and Equations Test - 34

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Question 1

combination

displacement

decomposition

neutralization

Solution

Question 2

reduced

oxidized

No change

None of the above

Solution

Question 3

Brown, black and green in colour

Black, brown and green in colour

Brown in colour in all the metals

Black in colour in all the metals

Solution

Question 4

(i) and (iii)

(iii) and (iv)

(ii) and (iv)

(ii) and (iii)

Solution

Question 5

displacement reaction

decomposition reaction

oxidation reaction

none of these

Solution

Question 6

two only

one or two only

one only

number cannot be specified

Solution

Question 7

Physical state of reactants and products

Symbols and formula of all the substance involved in a particular reaction

Number of atoms/molecule of the reactants and products formed

Whether a particular reaction is actually feasible or not

Solution

Question 8

Oxidation

Corrosion

Reduction

Hydrogenation

Question 9

Oxidation

Reduction

Decomposition

Redox

Solution

Question 10

(A) and (C)

(C) and (D)

(A), (C) and (D)

(A) and (B)

Solution

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