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1 Organic Chemistry MCQs

What is the main criterion for a compound to be aromatic?

  • Unsaturations
  • Cyclic structure
  • Presence of 4nπ electrons
  • Presence of 4n+2π electrons
0 Comments
Correct Answer: D. Presence of 4n+2π electrons

Explanation:

Aromatic compounds are a special class of organic molecules that show unusual stability ... Read More Details

2 Chemistry MCQs

The height of the troposphere varies between ________ km.

  • 7 at equator – 17 at poles
  • 17 at equator – 7 at poles
  • 18 at equator – 8 at poles
  • 8 at equator – 18 at poles
0 Comments
Correct Answer: B. 17 at equator – 7 at poles

Explanation:

The troposphere is the lowest layer of Earth’s atmosphere, extending from the surface ... Read More Details

3 Chemistry MCQs

Which layer extends from the top of the troposphere to the bottom of the mesosphere?

  • Thermosphere
  • Ionosphere
  • Stratosphere
  • None of the above
0 Comments
Correct Answer: C. Stratosphere

Explanation:

The stratosphere is the second layer of Earth’s atmosphere, positioned directly above the ... Read More Details

4 Chemistry MCQs

The stratosphere is present at an altitude between ________ km.

  • 15 – 35
  • 17 – 35
  • 18 – 35
  • 19 – 35
0 Comments
Correct Answer: A. 15 – 35

Explanation:

The stratosphere is the second layer of Earth’s atmosphere, situated above the troposphere ... Read More Details

5 Chemistry MCQs

Which atmospheric layer absorbs most of the Sun’s ultraviolet radiation?

  • Troposphere
  • Stratosphere
  • Mesosphere
  • Ionosphere
0 Comments
Correct Answer: B. Stratosphere

Explanation:

The stratosphere is the second layer of Earth’s atmosphere, extending from approximately 12 ... Read More Details

6 Chemistry MCQs

The stratosphere absorbs most of the __________ from the Sun.

  • Infrared radiation
  • Ultraviolet radiation
  • Ozone layer
  • Radio waves
0 Comments
Correct Answer: B. Ultraviolet radiation

Explanation:

The stratosphere is the second layer of Earth’s atmosphere, located above the troposphere ... Read More Details

7 Chemistry MCQs

The mesosphere ranges from ________ km to ________ km.

  • 46 – 85
  • 48 – 85
  • 50 – 85
  • 52 – 85
0 Comments
Correct Answer: C. 50 – 85

Explanation:

The mesosphere is the third layer of Earth’s atmosphere, lying above the stratosphere ... Read More Details

8 Chemistry MCQs

Which layer burns up most meteors before they reach Earth’s surface?

  • Troposphere
  • Stratosphere
  • Mesosphere
  • Ionosphere
0 Comments
Correct Answer: C. Mesosphere

Explanation:

The mesosphere is the third layer of Earth’s atmosphere, located above the stratosphere ... Read More Details

9 Chemistry MCQs

The thermosphere extends from about 85 km to ________ km.

  • 670 km
  • 680 km
  • 690 km
  • 700 km
0 Comments
Correct Answer: C. 690 km

Explanation:

The thermosphere is one of the upper layers of Earth’s atmosphere. It lies ... Read More Details

10 Chemistry MCQs

The atmosphere is held in place by __________.

  • Pressure of the planet
  • Gravity of the planet
  • Electric charge of the planet
  • Heat of the planet
0 Comments
Correct Answer: B. Gravity of the planet

Explanation:

The Earth is surrounded by a layer of gases called the atmosphere. This ... Read More Details

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