According to Charles' law, at constant pressure, the volume of a gas is directly proportional to its:
A. Pressure
B. Temperature in Celsius
C. Density
D. Absolute temperature
Answer: Option D
Solution (By JKSSB Mock Tests)
Charles' law: V ∝ T (Kelvin). So at constant P and n, V/T = constant. If temperature is in Celsius, proportionality is not direct because zero Celsius is not absolute zero. Absolute zero (0 K = -273.15°C) is the theoretical temperature at which volume becomes zero. A graph of V vs T (K) is a straight line through origin.
Explanation:
Mercury (Hg) is the only metal that is liquid at room temperature. Gallium and cesium melt slightly above room temperature. Sodium is solid but soft. Zinc and aluminium are solids. Mercury is used in thermometers and barometers.
Explanation:
Atomic radius increases down a group due to addition of new shells. Ionization energy, electronegativity, and electron affinity (generally) decrease down a group.
Explanation:
Unsaturated hydrocarbons contain at least one double or triple bond between carbon atoms. Benzene (C6H6) has a ring structure with alternating double bonds (delocalized pi electrons), making it highly unsaturated. Cyclohexane, propane, and methane contain only single bonds and are saturated hydrocarbons.
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