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Which of the following is a decomposition reaction? A A g + ( a q ) + C l − ( a q ) → A g C l ( s ) B C 5 ​ H 1 2 ​ ( l ) + 8 O 2 ​ ( g ) → 5 C O 2 ​ ( g ) + 6 H 2 ​ O ( l ) C N H 3 ​ ( l ) + H 2 ​ O ( l ) ⇋ N H 4 + ​ ( a q ) + O H − ( a q ) D H C 2 ​ H 3 ​ O 2 ​ ( l ) + O H − ( a q ) → H 2 ​ O ( l ) + C 2 ​ H 3 ​ O 2 − ​ ( a q ) E C a C O 3 ​ ( s ) → C a O ( s ) + C a O 2 ​ ( g )

Which of the following is a decomposition reaction?

A

Ag+(aq)+Cl(aq)AgCl(s)

B

C5H12(l)+8O2(g)5CO2(g)+6H2O(l)

C

NH3(l)+H2O(l)NH4+(aq)+OH(aq)

D

HC2H3O2(l)+OH(aq)H2O(l)+C2H3O2(aq)

E

CaCO3(s)CaO(s)+CaO2(g)

 

Grade:9

1 Answers

Mayank Ranka
askIITians Faculty 214 Points
8 months ago
As CaCO3 s decomposed into smaller fragments, CaO and CO2 

 

hence this is decomposition reaction  

Chemical decomposition, analysis or breakdown is the separation of a chemical compound into elements or simpler compounds. It is sometimes defined as the exact opposite of chemical synthesis. 
 
Hence, the correct option is E

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