1
JEE Main 2021 (Online) 27th July Evening Shift
Numerical
+4
-1
When 400 mL of 0.2 M H2SO4 solution is mixed with 600 mL of 0.1 M NaOH solution, the increase in temperature of the final solution is __________ $$\times$$ 10$$-$$2 K. (Round off to the nearest integer).

[Use : H+ (aq) + OH$$-$$ (aq) $$\to$$ H2O : $$\Delta$$$$\gamma$$H = $$-$$57.1 kJ mol$$-$$1]

Specific heat of H2O = 4.18 J K$$-$$1 g$$-$$1

density of H2O = 1.0 g cm$$-$$3

Assume no change in volume of solution on mixing.
2
JEE Main 2021 (Online) 27th July Morning Shift
Numerical
+4
-1
For water at 100$$^\circ$$ C and 1 bar,

$$\Delta$$vap H $$-$$ $$\Delta$$vap U = _____________ $$\times$$ 102 J mol$$-$$1. (Round off to the Nearest Integer)

[Use : R = 8.31 J mol$$-$$1 K$$-$$1]

[Assume volume of H2O(l) is much smaller than volume of H2O(g). Assume H2O(g) treated as an ideal gas]
3
JEE Main 2021 (Online) 25th July Evening Shift
Numerical
+4
-1
A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of the change in internal energy is ____________ J. (Nearest integer)
4
JEE Main 2021 (Online) 25th July Morning Shift
Numerical
+4
-1
At 298 K, the enthalpy of fusion of a solid (X) is 2.8 kJ mol$$-$$1 and the enthalpy of vaporisation of the liquid (X) is 98.2 kJ mol$$-$$1. The enthalpy of sublimation of the substance (X) in kJ mol$$-$$1 is _____________. (in nearest integer)
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