According to Charles' law, at constant pressure, the volume of a gas is directly proportional to its:
A. Absolute temperature
B. Pressure
C. Temperature in Celsius
D. Density
Answer: Option A
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:
Froth flotation separates sulfide ore particles from gangue by using oil and water. The ore particles adhere to the froth and float, while gangue sinks. Used for ZnS, PbS, CuFeS₂. Magnetic separation for magnetite, leaching for bauxite.
Explanation:
Across a period, the atomic radius decreases. This is because the number of protons (nuclear charge) increases, pulling the electrons in the same shell closer to the nucleus, while the number of shells remains constant. This increases the effective nuclear charge experienced by the valence electrons.
Explanation:
Diammonium phosphate (DAP) is (NH₄)₂HPO₄. It is produced by reacting ammonia with phosphoric acid: 2NH₃ + H₃PO₄ → (NH₄)₂HPO₄. It contains 18% N and 46% P₂O₅. Monoammonium phosphate (MAP) is NH₄H₂PO₄. Ammonium sulfate is (NH₄)₂SO₄. Triammonium phosphate is unstable. DAP is widely used as a starter fertilizer.
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