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:
Normal rainwater is slightly acidic (pH ~5.6) due to the dissolution of atmospheric CO2 forming carbonic acid. Acid rain is defined as precipitation with a pH lower than 5.6. It is caused by emissions of sulfur dioxide and nitrogen oxides, which react with water to form stronger sulfuric and nitric acids.
Explanation:
James Chadwick discovered the neutron in 1932. It is a neutral particle with mass almost equal to proton. Its discovery explained isotopes' mass differences.
Assertion (A): Methanol is highly toxic and can cause blindness if ingested. Reason (R): Methanol is metabolized in the body to formaldehyde and formic acid.
A.A is false but R is true.
B.A is true but R is false.
C.Both A and R are true and R is the correct explanation of A.
D.Both A and R are true but R is NOT the correct explanation of A.
Explanation:
Methanol (wood alcohol) is highly toxic. When ingested, it is metabolized by the enzyme alcohol dehydrogenase into formaldehyde and then formic acid. Formic acid interferes with mitochondrial function, leading to metabolic acidosis, optic nerve damage, and blindness. Both statements are correct and R explains A.
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