Global warming is mainly caused by increase in atmospheric:
A. Carbon dioxide
B. Nitrogen
C. Argon
D. Oxygen
Answer: Option A
Solution (By JKSSB Mock Tests)
CO₂ levels have risen due to burning fossil fuels, enhancing greenhouse effect. Methane, N₂O also contribute. Nitrogen and oxygen are not greenhouse gases.
Explanation:
The 'lock-and-key' model explains enzyme specificity: the substrate fits into the active site like a key in a lock. Protein nature is general; specificity arises from 3D structure.
Explanation:
Compressed Natural Gas (CNG) is primarily methane (CH₄). It is stored at high pressure (200-250 bar). It is used as a vehicular fuel and for cooking. LPG is primarily propane and butane. CNG is cleaner, produces less CO₂ per unit energy, and is safer in leaks as methane is lighter than air. It has high octane rating.
Explanation:
HCl + NaOH → NaCl + H₂O. This is a neutralization reaction producing sodium chloride (common salt). NaNO₃ from HNO₃, Na₂SO₄ from H₂SO₄, Na₂CO₃ from H₂CO₃ (weak acid).
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