Which of the following chemical equations is balanced?

Correct option is A

Correct Option: (a),  $$2H_2 + O_2 \rightarrow 2H_2O$$

$$2H_2 + O_2 \rightarrow 2H_2O$$​​

​On the left side, you have:

• ​4 hydrogen (H) atoms from ($$(2H_2)$$​
  
• 2 oxygen (O) atoms (from $$O_2)$$ 
  

​On the right side, you have:

• ​4 hydrogen (H) atoms (from $$2H_2O)$$ 
  
• 2 oxygen (O) atoms (from $$2H_2O)$$

​Both the hydrogen and oxygen atoms are equal on both sides of the equation, which makes this a balanced chemical equation .​​