1
JEE Main 2023 (Online) 24th January Morning Shift
Numerical
+4
-1 For independent process at 300 K

Process $$\mathrm{\Delta H/kJ~mol^{-1}}$$ $$\mathrm{\Delta S/J~K^{-1}}$$
A $$-25$$ $$-80$$
B $$-22$$ 40
C 25 $$-50$$
D 22 20

The number of non-spontaneous process from the following is __________

2
JEE Main 2022 (Online) 29th July Morning Shift
Numerical
+4
-1 When 600 mL of 0.2 M HNO3 is mixed with $$400 \mathrm{~mL}$$ of 0.1 M NaOH solution in a flask, the rise in temperature of the flask is ___________ $$\times 10^{-2}{ }\,^{\circ} \mathrm{C}$$.

(Enthalpy of neutralisation $$=57 \mathrm{~kJ} \mathrm{~mol}^{-1}$$ and Specific heat of water $$=4.2 \,\mathrm{JK}^{-1} \mathrm{~g}^{-1}$$) (Neglect heat capacity of flask)

3
JEE Main 2022 (Online) 28th July Evening Shift
Numerical
+4
-1 Among the following the number of state variables is ______________.

Internal energy (U)

Volume (V)

Heat (q)

Enthalpy (H)

4
JEE Main 2022 (Online) 27th July Evening Shift
Numerical
+4
-1 A gas (Molar mass = 280 $$\mathrm{~g} \mathrm{~mol}^{-1}$$) was burnt in excess $$\mathrm{O}_{2}$$ in a constant volume calorimeter and during combustion the temperature of calorimeter increased from $$298.0 \mathrm{~K}$$ to $$298.45$$ $$\mathrm{K}$$. If the heat capacity of calorimeter is $$2.5 \mathrm{~kJ} \mathrm{~K}^{-1}$$ and enthalpy of combustion of gas is $$9 \mathrm{~kJ} \mathrm{~mol}^{-1}$$ then amount of gas burnt is _____________ g. (Nearest Integer)

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