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The correct answer would be equation 4, because there are 4 Hydrogens and 2 Oxygens on each side of the equation making it balanced.

Answer:

[tex]2H_{2}+O_{2}[/tex]  ⇒  [tex]2H_{2}O[/tex] is balanced.

Explanation:

  • In the first equation number of oxygen is not balanced
  • In the second equation number of hydrogen is not balanced
  • In the third equation one oxygen is extra in RHS
  • The fourth equation is the balanced one.