Question

Which of the following statements is false regarding hydrogen ?

• A. It has two isotopes.
• B. In periodic table hydrogen is placed separately above group 1.
• C. When one electron is lost it forms proton.
• D. It does not exist freely.

Hint:

Hydrogen has three isotopes, protium, deuterium and tritium, so the statement about two isotopes is the false one.

Answer 1

The Correct Option is A

Step 1: Method
Test each statement against what we know about hydrogen.

Step 2: Isotopes
Natural hydrogen is mostly protium (99.98%), with deuterium (0.016%) and trace tritium, which is radioactive. That is three isotopes, not two, so statement (A) is incorrect.

Step 3: Other statements
The position above group 1 is the standard textbook placement, losing one electron gives $\text{H}^+$ (a proton), and hydrogen is found combined as water, acids and organic compounds, so these three are correct.

Step 4: Result
Therefore (A) is the false statement.

Final Answer:
Hydrogen has three isotopes, so (A) is false. This is option (A). \[ \boxed{\text{(A) }\text{It has two isotopes}} \]