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Test: Types Of Displacement Reactions - UPSC MCQ


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

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Test: Types Of Displacement Reactions - Question 1

In a given reaction, barium hydroxide reacts with ammonium chloride to form product X and Y. Identify X and Y.
Ba(OH)₂ + 2NH₄Cl → X + Y

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

In the given reaction, barium hydroxide reacts with ammonium chloride. The products X and Y are identified through the balanced chemical equation.

The balanced reaction is:
Ba(OH)2+2NH4Cl→BaCl2+2NH4OH 
The correct option is therefore A.

Test: Types Of Displacement Reactions - Question 2

Which of the following is an example of displacement reaction?

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

To determine which of the given reactions is an example of a displacement reaction, we need to understand that in a displacement reaction, a more reactive element displaces a less reactive element in a compound.

The correct answer is C:
- Magnesium (Mg) displaces hydrogen (H) in hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2).
- This reaction fits the criteria of a displacement reaction where a more reactive metal displaces a less reactive metal in a compound.

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Test: Types Of Displacement Reactions - Question 3

Identify the reaction: 

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

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

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

- Explanation:
- The reaction forms a solid precipitate, AgCl, which is insoluble.
- 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 is the creation of a solid from a solution. When the reaction occurs in a liquid solution, the solid formed is called the 'precipitate'. The chemical that causes the solid to form is called the 'precipitant'.

Test: Types Of Displacement Reactions - Question 4

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

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

The above reaction is an example of displacement reaction as in the above reaction the elemental Zinc is displacing hydrogen from the compound of hydrochloric acid which is released in the form of hydrogen gas. The Zinc then combines with Chlorine to form Zinc Chloride.

Test: Types Of Displacement Reactions - Question 5

Which metallic spoon can be used to stir lead nitrate solution?

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

A silver spoon should be used to stir lead nitrate solution because silver is less reactive than lead. In a displacement reaction, a more reactive metal can displace a less reactive metal from its compound. Since silver is less reactive than lead, it will not react with lead nitrate, preventing any displacement reaction. Thus, using silver is safe and appropriate in this case.

Test: Types Of Displacement Reactions - Question 6

Which of the following metal comes below copper in reactivity series?

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

The metal that comes below copper in the reactivity series is Silver (C)
Explanation:
The reactivity series ranks metals based on their reactivity from highest to lowest.

  • Copper is less reactive than Aluminium, Iron, and Zinc.
  • Silver is less reactive than Copper, placing it below Copper in the series.
  • Therefore, the correct answer is Silver (C).

In the reactivity series of metals, the order from most reactive to least reactive is typically:

  1. Potassium
  2. Sodium
  3. Calcium
  4. Magnesium
  5. Aluminium
  6. Zinc
  7. Iron
  8. Tin
  9. Lead
  10. Copper
  11. Silver
  12. Gold

Based on this series, silver comes below copper in the reactivity series.


     
Test: Types Of Displacement Reactions - Question 7

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

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

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 8

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

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

The given equation is a displacement reaction in which Fe of Fe2O3 has been displaced by Al. Hence, (c) is the correct option.

Test: Types Of Displacement Reactions - Question 9

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

Detailed Solution for Test: Types Of Displacement Reactions - Question 9

The other metals are less reactive than zinc.

Test: Types Of Displacement Reactions - Question 10

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

Detailed Solution for Test: Types Of Displacement Reactions - Question 10

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.

Test: Types Of Displacement Reactions - Question 11

The colours of aqueous solutions of CuSO4 and FeSO4 as observed in the laboratory are:

Detailed Solution for Test: Types Of Displacement Reactions - Question 11

The colours of aqueous solutions of CuSO4 and FeSO4 as observed in the laboratory are dark blue and pale green respectively.

Test: Types Of Displacement Reactions - Question 12

A strip of copper was placed in a beaker containing zinc sulphate solution. On observing the strip next day, it was noticed that:

Detailed Solution for Test: Types Of Displacement Reactions - Question 12

A displacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.

But copper can not lose electrons easily as compared to zinc and do not result in any reaction.

Thus there will no color change as no chemical reaction take place between the two.

Test: Types Of Displacement Reactions - Question 13

Which form of energy is responsible for the decomposition reactions ?

Detailed Solution for Test: Types Of Displacement Reactions - Question 13

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 14

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 14
  • When an iron nail is immersed in a copper sulfate solution, a displacement reaction occurs.
  • In this reaction, iron displaces copper from copper sulfate solution, leading to the formation of iron sulfate and metallic copper.
  • This explains why the iron nail turns brownish and the blue color of the copper sulfate solution fades, showcasing a classic example of a displacement reaction.
Test: Types Of Displacement Reactions - Question 15

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 15
  • 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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