Which one among the following equations is correctly balanced?

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Q: 78 (NDA-II/2012)

Which one among the following equations is correctly balanced?

question_subject: 

General Knowledge

question_exam: 

NDA-II

stats: 

0,2,2,1,2,0,1

keywords: 

{'equations': [0, 0, 1, 1], 'h20': [0, 0, 0, 4], 'naoh': [0, 0, 1, 9], 'h2': [0, 0, 4, 4], 'naai02': [0, 0, 0, 1], 'a1': [1, 0, 0, 3]}

Option 1:

The equation is not balanced because the number of hydrogen atoms on the left side does not match the number on the right side. It also does not balance the number of oxygen atoms.

Option 2:

This equation is correctly balanced because the number of atoms and elements on both sides of the equation are equal. There are 2 sodium (Na), 2 aluminum (Al), 4 hydrogen (H), and 2 oxygen (O) atoms on both sides.

Option 3:

This equation is not balanced because the number of hydrogen atoms on the left side is greater than the number on the right side. It also does not balance the number of oxygen atoms.

Option 4:

The equation is not balanced because the number of hydrogen atoms on the left side does not match the number on the right side. It also does not balance the number of oxygen atoms.

Therefore, the correct answer is option 2 as it is the only equation that is correctly balanced, with an equal number of atoms and elements on both sides.