Test: Types Of Displacement Reactions - UPSC

Ba(OH)₂ +2NH₄Cl → BaCl₂ +2NH₄OH

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

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'.

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.

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

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

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

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

Pb(NO₃)₂ + 2KI → PbI₂ + 2KNO₃

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

The other metals are less reactive than zinc.

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.

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

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.

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. 

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.