NTA JEE Main 2025 April 3rd Shift 2

X g of nitrobenzene on nitration gave 4.2 g of m-dinitrobenzene. X = ________ g. (nearest integer)
[Given: molar mass (in g mol$$^{-1}$$) C: 12, H: 1, O: 16, N: 14]

A perfect gas (0.1 mol) having $$\bar{C}_v = 1.50 R$$ (independent of temperature) undergoes the transformation from point 1 to point 4 as shown in the P-V diagram. If each step is reversible, the total work done (w) while going from point 1 to point 4 is $$(-) \text{____}$$ J (nearest integer).
[Given: $$R = 0.082$$ L atm $$K^{-1} mol^{-1}$$]

A sample of n-octane (1.14 g) was completely burnt in excess of oxygen in a bomb calorimeter, whose heat capacity is 5 kJ $$K^{-1}$$. As a result of combustion reaction, the temperature of the calorimeter is increased by 5 K. The magnitude of the heat of combustion of octane at constant volume is ________ kJ mol$$^{-1}$$ (nearest integer).

Among Sc, Mn, Co and Cu, identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is ________ BM (in nearest integer).

The total number of structural isomers possible for the substituted benzene derivatives with the molecular formula $$C_9H_{12}$$ is ________.