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Question

Which of the following is an example of double displacement reaction?
(i)
CO2(g)+H2(g)CO(g)+H2O(g)
(ii) P4O10(s)+6H2O(l)4H3PO4(aq)
(iii) H2+O2H2O​​​​​​​
(iv) CoCl2(aq)+Na2CO3(aq)CoCO3(aq)+2NaCl(aq)​​​​​​​


A

(i)

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B

(ii)

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C

(iii)

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D

(iv)

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Solution

The correct option is D

(iv)


In a double displacement reaction, the positive ions (cations) and the negative ions (anions) of the two reactants switch places, forming two new compounds or products.
In the equation,
CoCl2(aq)+Na2CO3(aq)CoCO3(aq)+2NaCl(aq)
the anions Cl & CO23 swap their places and form CoCO3 & 2NaCl,
hence it is an example of double displacement reaction.


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