Question

ratio of hydrogen and oxygen of water molecule.

• A. 1:2
• B. 2:3
• C. 2:1
• D. 3:2

Answer 1

Answer: (C)

2:1

Electron configuration: $O$: 2,6
Each oxygen atom contributes 2 electrons for sharing
Electron configuration of $H:1$
Each hydrogen atom contributes 1 electron for sharing
Hence tow hydrogen atoms are needed to contribute a total of 2 electrons for sharing.
Two single bonds are formed between the oxygen and hydrogen atoms.

the ratio of H and O is 2:1