Chemical Reactions and Equations Test

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Chemical Reactions and Equations Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Match the following with correct response.
(1) Reaction in which two substances combine to form new product
(2) substance split to form two or more simple substance
(3) More reactive metal displaces less reactive metal
(4) Loss or gain of electrons occurs

(A) Displacement reaction
(B) Combination Reaction
(C) Redox reaction
(D) Decomposition

A
1-A, 2-C, 3-B, 4-D

B
1-C, 2-B, 3-D, 4-A

C
1-D, 2-A, 3-C, 4-B

D
1-B, 2-D, 3-A, 4-C

Solution

2 or more reactants one product combination

breaking of 2 or more is decomposition

Loss and gain of electrons redox

more reactive metal displacing less reactive one displacement
Question 2
1 / -0

Match the following with correct response.
(1) Reaction between sodium chloride and silver nitrate
(2) Reaction between copper and Iron sulphate
(3) Reaction between Barium chloride and sodium sulphate
(4) Reaction between aqueous solution of Potassium chloride and bromine

(A) Potassium Bromide and chlorine gas
(B) Light green colour
(C) curdy white precipitate
(D) White precipitate

A
1-B, 2-D, 3-A, 4-C

B
1-A, 2-C, 3-B, 4-D

C
1-C, 2-B, 3-D, 4-A

D
1-D, 2-A, 3-C, 4-B

Solution

(1) When an aqueous solution of silver nitrate (AgNO₃) is added to the aqueous solution of sodium chloride (NaCl), a white precipitate of silver chloride (AgCl) is formed.
(2) Reaction between copper and Iron sulphate
Cu + FeSO₄ → CuSO₄ + Fe
(3) When barium chloride combines with sodium sulphate in the form of their aqueous solutions, a white precipitate of barium sulphate is formed which is insoluble in water.
(4) Br₂(aq) + 2KCl(aq) → 2KBr(aq) + Cl₂(aq)
Question 3
1 / -0

Match the following with correct response.
(1) Quick lime is added to water
(2) Formula for rust
(3) Silver tarnishing
(4) Pop sound

(A) Ca(OH)²
(B) H₂S gas
(C) Fe₂O₃.xH₂O
(D) H₂ gas

A
1-C, 2-B, 3-D, 4-A

B
1-B, 2-D, 3-A, 4-C

C
1-A, 2-C, 3-B, 4-D

D
1-D, 2-A, 3-C, 4-B

Solution

Quick lime when dissolved in water forms calcium hydroxide

Rust is hydrated iron oxide

Silver on exposure to sulphur compoundsgets tarnished due to formation of silver sulphide

Hydrogen gas produces pop sound when burning splinter is brought near it
Question 4
1 / -0

Match the following with correct response.
(1) Rancidity
(2) White washing
(3) Deposition of brown substance on iron nails
(4) Least reactive

(A) Calcium oxide mixed with water
(B) Gold
(C) Corrosion
(D) Oxygen

A
1-A, 2-C, 3-B, 4-D

B
1-C, 2-B, 3-D, 4-A

C
1-B, 2-D, 3-A, 4-C

D
1-D, 2-A, 3-C, 4-B

Solution

Rancidity caused due to oxidation

calcium oxide dissolved in water to whitewash walls

gold is at the bottom of the reactive series so least reactive

corrosion is forming of a brown coloured flaky substance
Question 5
1 / -0

Which is correct about oxidation?
A. Gain of oxygen
B. Loss of hydrogen
C. Loss of electron
D. Gain of hydrogen

A
A, B and C

B
B, C and D

C
A, B and D

D
A, B , C and D

Solution

Oxidation is gain of oxygen. Reduction is loss of oxygen.
Oxidation is loss of electrons. Reduction is gain of electrons.
Oxidation is loss of hydrogen. Reduction is gain of hydrogen.
Question 6
1 / -0

Fatty foods become rancid because of
A. Oxidation
B. Reduction
C. Reaction with Hydrogen
D. Reaction with oxygen

A
A, B, C and D

B
A and D

C
B and C

D
A and C

Solution

The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and test is called rancidity. Fatty foods become rancid because of oxidation means reaction with oxygen.
Question 7
1 / -0

Which of the following statement is correct?
A. Electrolysis of water is an example of decomposition reaction
B. Nitrogen is used to prevent rancidity
C. Melting of ice is a physical change
D. Corrosion requires presence of both air and moisture

A
A. B. C and D

B
A, B and D

C
A and B

D
A and C

Solution

(A) When electricity is passed in water, it decomposes into hydrogen and oxygen. 2H₂O → 2H₂ + O₂
(B) Nitrogen is an unreactive gas it prevents oxidation in turn it prevents rancidity of chips.
(C) Melting of ice is a physical change because it is a change in only the physical properties of the substance and it can be reversed, i.e, the substance formed can be restored back to their original form.
(D) Corrosion occurs in the presence of moisture. For example when iron is exposed to moist air, it reacts with oxygen to form rust.
Question 8
1 / -0

Reaction between water and quick lime gives rise to calcium hydroxide which of the following statement are correct?
A. The reaction is exothermic
B. The PH of final solution is less than 7
C. The reaction is endothermic
D. The PH of final solution is greater than 7

A
All of these

B
A and D

C
C and D

D
A and C

Solution

Calcium hydroxide when dissolved in water is an exothermic reaction and produces an alkaline media
Question 9
1 / -0

For the reaction, 3Fe + 4H₂O → Fe₂O₃+ 4H₂. Which of the following statement is correct?
A. Iron is oxidized
B. water is reduced
C. water act as reducing agent
D. Iron act as reducing agent

A
A and D

B
All of these

C
B and D

D
A, B and D

Solution

Fe is oxidized water is reduced so Fe is a reducing agent

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Chemical Reactions and Equations Test - 13

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Question 1

1-A, 2-C, 3-B, 4-D

1-C, 2-B, 3-D, 4-A

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

Solution

Question 2

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

1-C, 2-B, 3-D, 4-A

1-D, 2-A, 3-C, 4-B

Solution

Question 3

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

Solution

Question 4

1-A, 2-C, 3-B, 4-D

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

Solution

Question 5

A, B and C

B, C and D

A, B and D

A, B , C and D

Solution

Question 6

A, B, C and D

A and D

B and C

A and C

Solution

Question 7

A. B. C and D

A, B and D

A and B

A and C

Solution

Question 8

All of these

A and D

C and D

A and C

Solution

Question 9

A and D

All of these

B and D

A, B and D

Solution

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