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Test: Types Of Displacement Reactions - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Types Of Displacement Reactions

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Test: Types Of Displacement Reactions - Question 1

Which of the following is an example of displacement reaction?

Detailed Solution for Test: Types Of Displacement Reactions - Question 1

To identify the example of a displacement reaction, we must understand that this type of reaction occurs when a more reactive element replaces a less reactive element in a compound.

The correct answer is C:

  • Magnesium (Mg) displaces hydrogen (H) in hydrochloric acid (HCl).
  • This reaction produces magnesium chloride (MgCl2) and hydrogen gas (H2).
  • It meets the criteria for a displacement reaction, where a more reactive metal replaces a less reactive one.
Test: Types Of Displacement Reactions - Question 2

Identify the reaction: 

AgNO3(aq) + KCl(aq) → AgCl↓ + KNO3(aq)

Detailed Solution for Test: Types Of Displacement Reactions - Question 2

To identify the reaction between AgNO3(aq) and KCl(aq) as a precipitation reaction:

  • The reaction produces a solid precipitate, AgCl, which is insoluble in water.
  • This type of reaction involves the exchange of ions to form an insoluble product.
  • This is a classic example of a precipitation reaction.

Therefore, the correct answer is: C Precipitation reaction

Precipitation occurs when a solid is formed from a solution. The solid created is called a precipitate, and the substance that causes the solid to form is known as the precipitant.

Test: Types Of Displacement Reactions - Question 3

The reaction, Zn + 2HCl → ZnCl2 + H2 is an example of:

Detailed Solution for Test: Types Of Displacement Reactions - Question 3

The reaction is an example of a displacement reaction. In this process:

  • Zinc displaces hydrogen from hydrochloric acid.
  • This displacement results in the formation of hydrogen gas.
  • The remaining zinc combines with chlorine to produce zinc chloride.
Test: Types Of Displacement Reactions - Question 4

The reaction between lead nitrate and potassium iodide is an example of _______ .

Detailed Solution for Test: Types Of Displacement Reactions - Question 4

The reaction between lead nitrate and potassium iodide is an example of a double displacement reaction.
Explanation

  • Reaction Overview: When lead nitrate (Pb(NO3)2) reacts with potassium iodide (KI), they exchange ions.
  • Products Formed: This reaction results in the formation of lead iodide (PbI2) and potassium nitrate (KNO3).
  • Balanced Chemical Equation:
    Pb(NO3)2 + 2KI → PbI2 + 2KNO3

Concept Behind the Reaction

  • Double Displacement Reaction: In this type of reaction, the cations and anions of two different compounds switch places, forming two new compounds. Here, the Pb2+ from Pb(NO3)2 swaps places with the K+ from KI.
  • Visual Indication: A characteristic yellow precipitate of PbI2 forms, indicating the occurrence of the reaction.
  • Real-World Example: Such reactions are common in various chemical processes, including those in educational laboratory experiments.

The correct answer is option B.

Test: Types Of Displacement Reactions - Question 5

Fe2O3 + 2Al → Al2O3 + 2Fe
The above reaction is an example of a:

Detailed Solution for Test: Types Of Displacement Reactions - Question 5

The given equation represents a displacement reaction. In this reaction:

  • The iron (Fe) in Fe2O3 is replaced by aluminium (Al).
  • This type of reaction occurs when one element displaces another from its compound.

Thus, option (C) is the correct choice.

Test: Types Of Displacement Reactions - Question 6

Which of the following metals comes above zinc in reactivity series?

Detailed Solution for Test: Types Of Displacement Reactions - Question 6

The other metals are less reactive than zinc.

In the reactivity series, metals are ranked based on their ability to displace other metals from solutions. Here are some key points:

  • Aluminium is more reactive than zinc.
  • Both silver and copper are less reactive.
  • Iron is also less reactive than zinc.

Thus, the only metal listed that is above zinc in the reactivity series is aluminium.

Test: Types Of Displacement Reactions - Question 7

The given reaction indicates that:
Cu + 2AgNO3 → Cu(NO3)2 + 2Ag

Detailed Solution for Test: Types Of Displacement Reactions - Question 7

Inactivity series silver is placed below the copper, hence copper is more reactive than silver.

The more reactive element can displace the less reactive element from its solution. This can be summarised as follows:

  • Copper is positioned higher in the reactivity series compared to silver.
  • In a displacement reaction, a more reactive metal can replace a less reactive metal from its compound.
  • Therefore, in the reaction of copper with silver nitrate, copper displaces silver.
Test: Types Of Displacement Reactions - Question 8

Which form of energy is responsible for the decomposition reactions ?

Detailed Solution for Test: Types Of Displacement Reactions - Question 8

Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants.

Test: Types Of Displacement Reactions - Question 9

Why does an iron nail become brownish in color and the blue color of copper sulfate solution fades?

Detailed Solution for Test: Types Of Displacement Reactions - Question 9
  • When an iron nail is placed in a copper sulfate solution, a displacement reaction occurs.
  • In this reaction, iron replaces copper from the copper sulfate solution, resulting in the formation of iron sulfate and metallic copper.
  • This process explains why the iron nail turns brownish and the blue colour of the copper sulfate solution fades.
Test: Types Of Displacement Reactions - Question 10

Assertion (A): The iron nail becomes brownish in color and the blue color of copper sulfate solution fades.

Reason (R): In the reaction Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s), iron displaces copper in the copper sulfate solution.

Detailed Solution for Test: Types Of Displacement Reactions - Question 10
  • The Assertion is true as the iron nail indeed becomes brownish and the blue color of the copper sulfate solution fades due to the displacement reaction described.
  • The Reason is also true as iron displaces copper from the copper sulfate solution.
  • The Reason is the correct explanation of the Assertion because the observed color changes are a direct result of the displacement reaction where iron replaces copper in the solution.
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