Question

The chemical entities present in thermosphere of the atmosphere are

• A. \(O_2^+, O^+, NO^+, O\)
• B. \(O_3\)
• C. \(N_2, O_2, CO_2, H_2O\)
• D. \(O_3, O_2^+, O_2\)

Hint:

Thermosphere contains ionized gases due to high-energy solar radiation, so ions like \(O^+, O_2^+, NO^+\) are common.

Answer 1

The Correct Option is A

Step 1: Identify thermosphere.
Thermosphere is the region of atmosphere above mesosphere, where UV and X-rays ionize gases.
So it contains ionized species and atomic oxygen.
Step 2: Check which option contains ions.
Only option (A) has:
\[ O_2^+, O^+, NO^+, O \]
These are typical thermospheric / ionospheric constituents.
Step 3: Conclude correct answer.
Thus, the chemical entities present in thermosphere are ionized oxygen and nitric oxide ions.
Final Answer:
\[ \boxed{O_2^+, O^+, NO^+, O} \]