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Test: Types Of Displacement Reactions


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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 + NH4Cl → X + Y​

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

Ba(OH)2 +2NH4Cl → BaCl2 +2NH4OH

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

It is a single replacement reaction. 
Mg + 2HCl → MgCl2  + H2 

Test: Types Of Displacement Reactions - Question 3

The reactions in which a precipitate is formed are also known as:

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

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

Iron displaces copper from its salt solution because:

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

Fe is more reactive than Cu, hence Fe can displace the Cu from its salt solution.

Test: Types Of Displacement Reactions - Question 6

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

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

Silver is less reactive than lead, so there will be no displacement reaction.

Test: Types Of Displacement Reactions - Question 7

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

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

Nature of material of which they are made resistance is depend upon nature of material of which they are made for two wire of same physical dimensions one of the mode of copper and another is silver then reside of silver is much less then resistance of copper

Test: Types Of Displacement Reactions - Question 8

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

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

Lead nitrate reacts with Potassium iodide to form Lead iodide and Potassium nitrate.

Pb(NO3)2 + 2KI → PbI2 + 2KNO3

Test: Types Of Displacement Reactions - Question 9

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

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

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 10

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

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

The other metals are less reactive than zinc.

Test: Types Of Displacement Reactions - Question 11

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

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

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 12

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

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

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 13

Which of the following statement is correct?

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

A more reactive metal displaces a less reactive metal from its salt solution.

When a more reactive metal is placed in the salt solution of a less reactive metal,then the more reactive metal displaces the less reactive metal from its salt solution.

Test: Types Of Displacement Reactions - Question 14

When iron filings are added to a blue coloured copper sulphate solution, what colour change would you observe in solution?

Detailed Solution for Test: Types Of Displacement Reactions - Question 14

When Copper sulphate and iron nail are put together then the reactions occurs is: 

Fe(s) + CuSO₄ (aq) → FeSO₄(aq) + Cu (s)

As we know the colour copper sulphate solution is blue in colour. When we put iron nail in it , copper forms brown coloured coating on iron nail. The solution's colour also changes to light green colour. 

Test: Types Of Displacement Reactions - Question 15

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 15

A single replacement 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.

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