• 1. Greenhouse effect
• 2. Fire in coal mines
• 3. Dry farming
• 4. Monsoon

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• 1. electrons and neutrons
• 2. electrons and protons
• 3. protons and neutrons
• 4. All of the above

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• 1. molality
• 2. molarity
• 3. normality
• 4. formality

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• 1. Na
• 2. Ag
• 3. Hg
• 4. Fe

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• 1. p-electrons in Ne(Z = 10)
• 2. s-electrons in Mg(Z = 12)
• 3. d-electrons in Fe(Z = 26)
• 4. p-electrons in CI(Z = 17)

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• 1. smelting
• 2. roasting
• 3. calcinations
• 4. froth floatation

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• 1. H₂ at -73^oC
• 2. CH₄ at 300 K
• 3. N₂ at 1,027^oC
• 4. O₂ at 0^oC

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• 1. Dalton's law
• 2. Gay Lussac's law
• 3. Henry's law
• 4. Raoult's law

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• 1. H₂CO₃ - HCO₃
• 2. H₂CO₃ - CO₃^2-
• 3. CH₃COOH - CH₃COO^-
• 4. NH₂CONH₂ - NH₂CONH⁺

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• 1. helium
• 2. ozone
• 3. oxygen
• 4. methane

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