Global warming is primarily due to the increase in atmospheric concentration of: MCQ with Answer and Explanation

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Global warming is primarily due to the increase in atmospheric concentration of:

A. Nitrogen

B. Carbon dioxide

C. Argon

D. Oxygen

Answer: Option B

Solution (By JKExamLibrary)

The enhanced greenhouse effect causing global warming is mainly due to rising CO₂ levels from fossil fuel combustion, deforestation, and industrial processes. Other GHGs like CH₄, N₂O, CFCs also contribute. Oxygen and nitrogen are not greenhouse gases. Argon is noble gas, inert. The atmospheric CO₂ has increased from ~280 ppm (pre-industrial) to over 420 ppm. This leads to climate change, sea level rise, and extreme weather.

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Question #1

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Who is credited with the discovery of the nucleus through the alpha-particle scattering experiment?

A. J.J. Thomson

B. James Chadwick

C. Ernest Rutherford

D. Niels Bohr

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Correct Answer: Option C

Explanation:
Ernest Rutherford, along with his students Geiger and Marsden, conducted the famous gold foil experiment in 1911. By observing that a few alpha particles bounced back, he concluded that the atom has a small, dense, positively charged center called the nucleus.

This question belongs to: Science chemistry

Question #2

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Which of the following is used as a chemical in fire extinguishers?

A. Calcium oxide

B. Sodium chloride

C. Sodium bicarbonate

D. Magnesium sulfate

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Correct Answer: Option C

Explanation:
NaHCO₃ decomposes on heating, releasing CO₂ which smothers fire. Also used in soda-acid extinguishers with H₂SO₄ to produce CO₂. NaCl is table salt, CaO is quicklime, MgSO₄ is Epsom salt.

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Question #3

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Plaster of Paris is obtained by heating gypsum at:

A. 373 K

B. 573 K

C. 473 K

D. 673 K

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Correct Answer: Option A

Explanation:
Plaster of Paris (CaSO₄·½H₂O) is formed by heating gypsum (CaSO₄·2H₂O) at 373 K (100°C). This causes it to lose 1.5 molecules of water per formula unit. If heated significantly above 473 K, it loses all water and forms dead burnt plaster (anhydrous CaSO₄), which cannot set with water.

This question belongs to: Science chemistry

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