Which of the following salts does not contain water of crystallization?
A. Washing soda
B. Blue vitriol
C. Baking soda
D. Gypsum
Answer: Option C
Solution (By JKSSB Mock Tests)
Baking soda (NaHCO₃) is an anhydrous salt and does not contain water of crystallization. Blue vitriol (CuSO₄·5H₂O), washing soda (Na₂CO₃·10H₂O), and gypsum (CaSO₄·2H₂O) all contain fixed water molecules integrated into their crystal lattice, which gives them their specific shape and color.
Explanation:
Natural gas (mainly methane) is a fossil fuel formed from ancient organic matter. Biogas is a renewable fuel from recent organic waste. Hydrogen is an energy carrier, not a fossil fuel. Solar energy is renewable.
Explanation:
Use Charles' law: V₁/T₁ = V₂/T₂. T in Kelvin: T₁ = 27+273 = 300 K, T₂ = 327+273 = 600 K. V₂/V₁ = T₂/T₁ = 600/300 = 2. Volume doubles. The ratio is 2:1. Note that 27 to 327 is a 300°C increase, but absolute temperature doubles.
Explanation:
CH₃CH₂OH is ethyl alcohol or ethanol. Methanol is CH₃OH. Propanol C₃H₇OH. Butanol C₄H₉OH. Ethanol is the active ingredient in alcoholic beverages and used as biofuel.
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