1

JEE Main 2021 (Online) 26th August Morning Shift

Numerical

+4

-1

The Born-Haber cycle for KCl is evaluated with the following data :

$${\Delta _f}{H^\Theta }$$ for KCl = $$-$$436.7 kJ mol

$${\Delta _{sub}}{H^\Theta }$$ for K = 89.2 kJ mol

$${\Delta _{ionization}}{H^\Theta }$$ for K = 419.0 kJ mol

$${\Delta _{electron\,gain}}{H^\Theta }$$ for Cl

$${\Delta _{bond}}{H^\Theta }$$ for Cl

The magnitude of lattice enthalpy of KCl in kJ mol

$${\Delta _f}{H^\Theta }$$ for KCl = $$-$$436.7 kJ mol

^{$$-$$1};$${\Delta _{sub}}{H^\Theta }$$ for K = 89.2 kJ mol

^{$$-$$1};$${\Delta _{ionization}}{H^\Theta }$$ for K = 419.0 kJ mol

^{$$-$$1};$${\Delta _{electron\,gain}}{H^\Theta }$$ for Cl

_{(g)}= $$-$$348.6 kJ mol^{$$-$$1};$${\Delta _{bond}}{H^\Theta }$$ for Cl

_{2}= 243.0 kJ mol^{$$-$$1}The magnitude of lattice enthalpy of KCl in kJ mol

^{$$-$$1}is _____________ (Nearest integer)Your input ____

2

JEE Main 2021 (Online) 27th July Evening Shift

Numerical

+4

-1

When 400 mL of 0.2 M H

[Use : H

Specific heat of H

density of H

Assume no change in volume of solution on mixing.

_{2}SO_{4}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) $$\to$$ H_{2}O : $$\Delta$$_{$$\gamma$$}H = $$-$$57.1 kJ mol^{$$-$$1}]Specific heat of H

_{2}O = 4.18 J K^{$$-$$1}g^{$$-$$1}density of H

_{2}O = 1.0 g cm^{$$-$$3}Assume no change in volume of solution on mixing.

Your input ____

3

JEE Main 2021 (Online) 27th July Morning Shift

Numerical

+4

-1

For water at 100$$^\circ$$ C and 1 bar,

$$\Delta$$

[Use : R = 8.31 J mol

[Assume volume of H

$$\Delta$$

_{vap}H $$-$$ $$\Delta$$_{vap}U = _____________ $$\times$$ 10^{2}J mol^{$$-$$1}. (Round off to the Nearest Integer)[Use : R = 8.31 J mol

^{$$-$$1}K^{$$-$$1}][Assume volume of H

_{2}O(l) is much smaller than volume of H_{2}O(g). Assume H_{2}O(g) treated as an ideal gas]Your input ____

4

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)

Your input ____

Questions Asked from Thermodynamics (Numerical)

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