A molecule is paramagnetic if it has unpaired electrons. Oxygen (\( O_2 \)) has two unpaired electrons in its molecular orbital configuration, making it paramagnetic. Other molecules listed (like \( N_2 \) and \( H_2 \)) do not have unpaired electrons, making them diamagnetic.
Thus, the correct answer is (A).
The vapour pressure of H\(_2\)O at 323K is 95 mm of Hg. 176g of sucrose (Molar mass = 342 gmol\(^{-1}\)) is added to 900g of H\(_2\)O at 323K.
The vapour pressure of solution is about
Kepler's second law (law of areas) of planetary motion leads to law of conservation of