Chemical Reactions and Equations Test

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Chemical Reactions and Equations Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

Rusting of iron takes place only when both ...................... and ...................... are present.

A
oxygen, moisture

B
oil, sand

C
sand, water

D
none of the above

Solution

Rusting of iron takes place only when both air and moisture are present. Rust is hydrated iron oxide and its development leads to the damage of the iron material.
Question 2
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Which of the following is a decomposition reaction ?

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

B
$$NH_{4}CNO \rightarrow\ H_{2}NCONH_2$$

C
$$2KClO_3 \rightarrow\ 2KCl + 3O_{2}$$

D
$$H_{2} + I_{2} \rightarrow\ 2HI$$

Solution

Hint: A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.

Correct Answer: Option $$C$$

The explanation for the correct option:
A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: $$AB → A + B$$
$$2KClO_3 \rightarrow\ 2KCl + 3O_{2}$$
Here, we can see reactant is broken into two products. So it is a decomposition reaction.

The explanation for incorrect options:

A).
The neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form salt and water as products.
acid + base(alkali) → salt + water
$$NaOH + HCl \rightarrow NaCl + H_2O$$
So option $$A$$ is a neutralization reaction

B).
$$NH_{4}CNO \rightarrow\ H_{2}NCONH_2$$
It is not a decomposition reaction as we are getting a single product.

D).
A reaction in which two or more reactants combine to form a single product is known as a combination reaction.
$$H_{2} + I_{2} \rightarrow\ 2HI$$
Question 3
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Reaction in which oxygen is added to the substance is called _________ reaction.

A
oxidation

B
reduction

C
addition

D
None of these

Solution

The reaction in which oxygen is added or hydrogen is removed is known as an oxidation reaction.
The reaction in which oxygen is lost or hydrogen is gained is known as a reduction reaction.
So the correct option is $$A$$.
Question 4
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The main cause of rancidity in foods is:

A
bacteria

B
proteins

C
antioxidants

D
oxidation of the fatty acid molecule

Solution

The condition produced by aerial oxidation of fats and oils in food, due to which unpleasant taste and smell occurs is called as rancidity.
Question 5
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Which of the following is not a decomposition reaction ?

A
CaCO$$_3$$ $$\rightarrow$$ CaO + CO$$_2$$

B
2KClO$$_3$$ $$\rightarrow$$ 2KCl + 3O$$_2$$

C
Digestion of food in the body

D
NaOH + HCl $$\rightarrow$$ NaCl + H$$_2$$O

Solution

Hint:
A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.

Correct answer: $$D$$

Explanation for correct option :

(D)$$NaOH + HCl \rightarrow NaCl + H_2O$$
A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form salt and water as products.
acid + base(alkali) → salt + water
So option D is neutralization reaction

Explanation for incorrect options:

(A)$$CaCO_3 \rightarrow CaO + CO_2$$
A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: $$AB → A + B$$
$$CaCO_3 \rightarrow CaO + CO_2$$
Here, we can see reactant is broken into two products so we can say it is a decomposition reaction.

(B) $$2KClO_3 \rightarrow\ 2KCl + 3O_{2}$$
A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: $$AB → A + B$$
$$2KClO_3 \rightarrow\ 2KCl + 3O_{2}$$
Here, we can see reactant is broken into two products so we can say it is a decomposition reaction.

(C) Digestion of food in the body :
A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more elements or new compounds. Digestion in our body is also an example of decomposition reactions.
Question 6
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$$Zn + xHCl \rightarrow ZnCl_2 + A$$
In above equation A and x are :

A
$$H_2, 2$$

B
$$Cl_2, 1$$

C
$$H_2, 3$$

D
$$H_2, 4$$

Solution

$$Zn + 2HCl \rightarrow ZnCl_2 + H_2$$

So, A=2 and x=2.
Question 7
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The term used to indicate the development of unpleasant smell and taste in fat and oil-containing foods due to aerial oxidation is:

A
acidity

B
radioactivity

C
rabidity

D
rancidity

Solution

The term used to indicate the development of unpleasant smell and taste in fat and oil-containing foods due to aerial oxidation is rancidity.
The process of oxidizing fatty and oily substances is called rancidity.
Question 8
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Find the values of w, x, y and z for the following reaction. Also, identify the type of reaction.

w(Potassium bromide) + x(Barium iodide) $$\longrightarrow $$ y(Potassium iodide) + z(Barium bromide)

A
1, 1, 1, 1 ; Double displacement reaction

B
1, 1, 1, 1 ; Decomposition reaction

C
2, 1, 2, 1 ; Double displacement reaction

D
2, 1, 2, 1 ; Decomposition reaction

Solution

Reaction:
$$2KBr + BaI_2 \rightarrow 2KI + BaBr_2$$

It is a double displacement reaction, also known as a double replacement reaction (is a type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products.)
Question 9
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In the reaction $$FeSO_4 + x\, \rightarrow\, Na_2SO_4 + Fe(OH)_2,x$$ is:

A
$$Na_2SO_4$$

B
$$H_2SO_4$$

C
$$NaOH$$

D
None of these

Solution

$$FeSO_4 + 2NaOH \rightarrow Na_2SO_4 + Fe(OH)_2 $$

From the above reaction, $$x$$ is $$NaOH$$.
So, correct option is $$C$$.
Question 10
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Determine the reaction type for the given reaction.
$$P_4O_{10}+6H_2O\rightarrow 4H_3PO_4$$

A
Decomposition reaction

B
Combination reaction

C
Displacement reaction

D
Double displacement reaction

Solution

In reaction, two simple substances combine to form a more complex substance. Thus, it is a combination reaction.

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Chemical Reactions and Equations Test - 29

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Chemical Reactions and Equations Test - 29

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Question 1

oxygen, moisture

oil, sand

sand, water

none of the above

Solution

Question 2

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

$$NH_{4}CNO \rightarrow\ H_{2}NCONH_2$$

$$2KClO_3 \rightarrow\ 2KCl + 3O_{2}$$

$$H_{2} + I_{2} \rightarrow\ 2HI$$

Solution

Question 3

oxidation

reduction

addition

None of these

Solution

Question 4

bacteria

proteins

antioxidants

oxidation of the fatty acid molecule

Solution

Question 5

CaCO$$_3$$ $$\rightarrow$$ CaO + CO$$_2$$

2KClO$$_3$$ $$\rightarrow$$ 2KCl + 3O$$_2$$

Digestion of food in the body

NaOH + HCl $$\rightarrow$$ NaCl + H$$_2$$O

Solution

Question 6

$$H_2, 2$$

$$Cl_2, 1$$

$$H_2, 3$$

$$H_2, 4$$

Solution

Question 7

acidity

radioactivity

rabidity

rancidity

Solution

Question 8

1, 1, 1, 1 ; Double displacement reaction

1, 1, 1, 1 ; Decomposition reaction

2, 1, 2, 1 ; Double displacement reaction

2, 1, 2, 1 ; Decomposition reaction

Solution

Question 9

$$Na_2SO_4$$

$$H_2SO_4$$

$$NaOH$$

None of these

Solution

Question 10

Decomposition reaction

Combination reaction

Displacement reaction

Double displacement reaction

Solution

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