In the redox reaction Zn + CuSO₄ → ZnSO₄ + Cu, the reducing agent is: MCQ with Answer and Explanation

Explanation:
The thermite reaction involves aluminum powder reacting with iron(III) oxide to produce molten iron and aluminum oxide (2Al + Fe₂O₃ → Al₂O₃ + 2Fe). It is highly exothermic and is used for welding railway tracks and repairing metal structures in the field.

Explanation:
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:
Group 18 elements are noble gases: helium, neon, argon, krypton, xenon, radon. They have completely filled valence shells, making them chemically inert (though xenon can form compounds). Nitrogen is Group 15, Oxygen Group 16, Hydrogen is unique (Group 1).