A 5.0 m mol dm^$$-$$3 aqueous solution of KCl has a conductance of 0.55 mS when measured in a cell of cell constant 1.3 cm^$$-$$1. The molar conductivity of this solution is ___________ mSm² mol^$$-$$1. (Round off to the Nearest Integer).

At 25$$^\circ$$C, 50 g of iron reacts with HCl to form FeCl₂. The evolved hydrogen gas expands against a constant pressure of 1 bar. The work done by the gas during this expansion is _________ J. (Round off to the Nearest Integer).

[Given : R = 8.314 J mol^$$-$$1 K^$$-$$1. Assume, hydrogen is an ideal gas] [Atomic mass of Fe is 55.85 u]

The number of orbitals with n = 5, m₁ = +2 is ___________. (Round off to the Nearest Integer).

A and B decompose via first order kinetics with half-lives 54.0 min and 18.0 min respectively. Starting from an equimolar non reactive mixture of A and B, the time taken for the concentration of A to become 16 times that of B is _________ min. (Round off to the Nearest Integer).