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Question

Which of the following chemical equations is an unbalanced one?


A

2NaHCO3Na2CO3+H2O+CO2

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B

2C4H10+12O28CO2+10H2O

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C

2Al+6H2O2Al(OH)3+3H2

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D

4NH3+5O24NO+6H2O

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Solution

The correct option is B

2C4H10+12O28CO2+10H2O


Explanation of the correct option:

The correct option is B:

  • A balanced chemical equation occurs when the number of the different atoms of elements on the reactants side is equal to that of the products side.
  • 2C4H10+12O28CO2+10H2OC=8C=8H=20H=20O=24O=26
  • As the number of atoms (oxygen) is not equal on both sides, the reaction is unbalanced.
  • The correct balanced chemical equation for option B will be 2C4H10+13O28CO2+10H2O.

Explanation of the incorrect options:

  • Options A, C, and D are balanced chemical equations as the number of atoms of all the molecules on both sides is equal.

Final Answer: Unbalanced chemical equation is 2C4H10+12O28CO2+10H2O.


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