1
JEE Main 2022 (Online) 26th July Morning Shift
Numerical
+4
-1

$$2.4 \mathrm{~g}$$ coal is burnt in a bomb calorimeter in excess of oxygen at $$298 \mathrm{~K}$$ and $$1 \mathrm{~atm}$$ pressure. The temperature of the calorimeter rises from $$298 \mathrm{~K}$$ to $$300 \mathrm{~K}$$. The enthalpy change during the combustion of coal is $$-x \mathrm{~kJ} \mathrm{~mol}^{-1}$$. The value of $$x$$ is ___________. (Nearest Integer)

(Given : Heat capacity of bomb calorimeter $$20.0 \mathrm{~kJ} \mathrm{~K}^{-1}$$. Assume coal to be pure carbon)

2
JEE Main 2022 (Online) 25th July Evening Shift
Numerical
+4
-1

While performing a thermodynamics experiment, a student made the following observations.

HCl + NaOH $$\to$$ NaCl + H2O $$\Delta$$H = $$-$$57.3 kJ mol$$-$$1

CH3COOH + NaOH $$\to$$ CH3COONa + H2O $$\Delta$$H = $$-$$55.3 kJ mol$$-$$1

The enthalpy of ionization of CH3COOH as calculated by the student is _____________ kJ mol$$-$$1. (nearest integer)

3
JEE Main 2022 (Online) 25th July Morning Shift
Numerical
+4
-1

The enthalpy of combustion of propane, graphite and dihydrogen at $$298 \mathrm{~K}$$ are $$-2220.0 \mathrm{~kJ} \mathrm{~mol}^{-1},-393.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$$ and $$-285.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$$ respectively. The magnitude of enthalpy of formation of propane $$\left(\mathrm{C}_{3} \mathrm{H}_{8}\right)$$ is _______________ $$\mathrm{kJ} \,\mathrm{mol}^{-1}$$. (Nearest integer)

4
JEE Main 2022 (Online) 30th June Morning Shift
Numerical
+4
-1

1.0 mol of monoatomic ideal gas is expanded from state 1 to state 2 as shown in the figure. The magnitude of the work done for the expansion of gas from state 1 to state 2 at 300 K is ____________ J. (Nearest integer)

(Given : R = 8.3 J K$$-$$1 mol$$-$$1, ln10 = 2.3, log2 = 0.30)