Which of the following has the lowest melting point?

For an electron with $n = 3$,there is only one radial node. The orbital angular momentum of the electron will be

The major product of the following reaction is

$A$ ball of mass $2\;kg$ and another of mass $4\;kg$ are dropped together from a $60\;ft$ tall building. After a fall of $30\;ft$ each towards the Earth,their respective kinetic energies will be in the ratio of?

$A$ molecule that can act as a genetic material must fulfill the traits given below,except.

Wires $P$ and $Q$ have the same resistance at ordinary (room) temperature. When heated,the resistance of $P$ increases and that of $Q$ decreases. We conclude that