Chemical Reactions and Equations Test

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Chemical Reactions and Equations Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

You mix two colourless solutions and the resulting mixture becomes cloudy. What type of reaction is observed?

A
A physical reaction

B
A redox reaction

C
A precipitation reaction

D
An acid base reaction

Solution

When two solutions are mixed and the mixture becomes cloudy, it suggests the formation of an insoluble substance. The chemical reaction that occurs here is a precipitation reaction and the insoluble substance formed is called precipitate. This is an example of a double displacement reaction.

For example:
$$Na_2SO_4 + BaCl_2 \rightarrow BaSO_4 + 2NaCl$$
In this reaction, $$BaSO_4$$ is the precipitate.
Question 2
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Chemical volcano is an example of:

A
combination reaction

B
decomposition reaction

C
displacement reaaction

D
none of the above

Solution

A chemical volcano is an example of a decomposition reaction.
When ammonium dichromate is heated at high temperatures, it decomposes to chromium oxide, nitrogen gas, and steam, so this is called a chemical volcano.
reaction:- $$(NH_4)_{2}Cr_2O_7 \longrightarrow Cr_2O_3 + N_2 + 4H_2O$$

The correct option is $$B$$.
Question 3
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$$C_{6}H_{12} O_{6}\rightarrow 2C_{2}H_{5}OH + 2CO_{2}$$ is a ______ reaction.

A
combination

B
decomposition

C
displacement

D
double decomposition

Solution

This is an example of a decomposition reaction. In a decomposition reaction, a single compound breaks down to form two or more new compounds or elements. It requires an energy source such as heat, light or electricity.
Question 4
1 / -0

Study the following chemical reactions.
$$\displaystyle Fe + CuSO_4 \rightarrow FeSO_4 + Cu$$
$$2 AgNO_3 + Cu \rightarrow Cu (NO_3)_2 + 2Ag$$

The metals present in the reactions can be written in the increasing order of reactivity as:

A
$$Fe, Cu, Ag$$

B
$$Cu, Fe, Ag$$

C
$$Ag, Fe, Cu$$

D
$$Ag, Cu, Fe$$

Solution

We know that the more reactive metal displaces the less reactive one. Here in the first reaction Fe Displaces Cu so, Fe is more reactive. In the second reaction, Cu displaces Ag so, Cu is more reactive.

So, the increasing order is Ag < Cu < Fe.
Question 5
1 / -0

The decomposition of a certain mass of a $$CaCO_3$$ gave $$11.2\, dm^3$$ of $$CO_2$$ gas at STP. The mass of KOH required to completely neutralize the gas is:

A
56 g

B
28 g

C
42 g

D
20 g
Question 6
1 / -0

Precipitate in a reaction is indicated by which arrow mark?

A
$$\rightarrow$$

B
$$\uparrow$$

C
$$\downarrow$$

D
$$\leftarrow$$

Solution

The precipitate is usually insoluble part or settles down in mixture (due to denser) and hence downward arrow sign is written $$(\downarrow)$$.
Question 7
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The mixture of carbon and sulphur is separated by using the solution of _________.

A
carbon dioxide

B
carbon disulphide

C
carbon monoxide

D
sulphur oxide

Solution

The mixture of carbon and sulphur can be separated from each other by using a solution of carbon disulphide. Sulphur gets dissolved in the solution whereas carbon remains undissolved. This mixture is then filtered to remove carbon followed by evaporation to obtain sulphur.
Question 8
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Which of the following process involves chemical reaction?

A
Formation of ice from water

B
Respiration

C
Compression of sponge

D
Cutting of tree

Solution

The respiratory reaction is an example of chemical change. Respiration is a form of oxidation.

Glucose is oxidized to $$CO_2$$ and $$H_2O$$ (along with the release of energy) at the cells by the oxygen from the air we breathe in.

$$C_6H_{12}O_6 + 6 O_2 \to 6 CO_2 + 6 H_2O$$

Since glucose is converted into new products with different composition, respiration is a chemical change.
Question 9
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Which of the following is not a characteristic of a chemical reaction?

A
Formation of precipitate

B
Change in color

C
Change in temperature

D
None of the above
Solution
A chemical reaction is characterized by:
- Change in temperature
- Change in colour
- Change in state
- Evolution of gas
- Formation of precipitate
Hence, option $$D$$ is correct.
Question 10
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Constituents of the compounds can be separated by

A
physical methods

B
chemical reactions

C
Both A and B

D
None of A or B

Solution

The components of a compound are chemically combined, they cannot be separated easily by physical methods, their separation requires methods like chemical reactions.

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Chemical Reactions and Equations Test - 33

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Chemical Reactions and Equations Test - 33

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Question 1

A physical reaction

A redox reaction

A precipitation reaction

An acid base reaction

Solution

Question 2

combination reaction

decomposition reaction

displacement reaaction

none of the above

Solution

Question 3

combination

decomposition

displacement

double decomposition

Solution

Question 4

$$Fe, Cu, Ag$$

$$Cu, Fe, Ag$$

$$Ag, Fe, Cu$$

$$Ag, Cu, Fe$$

Solution

Question 5

56 g

28 g

42 g

20 g

Question 6

$$\rightarrow$$

$$\uparrow$$

$$\downarrow$$

$$\leftarrow$$

Solution

Question 7

carbon dioxide

carbon disulphide

carbon monoxide

sulphur oxide

Solution

Question 8

Formation of ice from water

Respiration

Compression of sponge

Cutting of tree

Solution

Question 9

Formation of precipitate

Change in color

Change in temperature

None of the above

Solution

Question 10

physical methods

chemical reactions

Both A and B

None of A or B

Solution

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