Synthetic detergents have advantage over soaps because:
A. They work well in hard water
B. They are biodegradable
C. They are natural products
D. They are cheaper
Answer: Option A
Solution (By JKExamLibrary)
Detergents do not form scum with Ca²⁺/Mg²⁺, so they clean effectively in hard water. Soaps form insoluble precipitates. Biodegradability varies; some detergents are non-biodegradable.
Explanation:
Ionization energy generally increases across a period due to increasing nuclear charge. Neon (noble gas) has the highest ionization energy in period 2 because of its stable filled octet (2s²2p⁶). Removing an electron requires enormous energy. Fluorine is next highest. Lithium has lowest. Noble gases have very high IE values, making them inert.
Explanation:
Bohr proposed that electrons revolve in certain allowed orbits with fixed energy, and they can jump between orbits by absorbing/emitting quanta of energy. This explained hydrogen spectrum. Electron cloud is quantum mechanical model; wave nature by de Broglie; uncertainty by Heisenberg.
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.
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