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:
Ionic compounds consist of oppositely charged ions held together by strong electrostatic forces (ionic bonds). This results in high melting points and solubility in polar solvents.
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:
Mendeleev used atomic mass as basis. Anomalies like Ar (mass 40) placed before K (mass 39) occurred. These were resolved when Moseley proposed atomic number as the basis.
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