1
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)
2
JEE Main 2021 (Online) 22th July Evening Shift
Numerical
+4
-1
If the standard molar enthalpy change for combustion of graphite powder is $$-$$2.48 $$\times$$ 102 kJ mol$$-$$1, the amount of heat generated on combustion of 1 g of graphite powder is ___________ kJ. (Nearest integer)
3
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
For a given chemical reaction A $$\to$$ B at 300 K the free energy change is $$-$$49.4 kJ mol$$-$$1 and the enthalpy of reaction is 51.4 kJ mol$$-$$1. The entropy change of the reaction is _____________ JK$$-$$1 mol$$-$$1.
4
JEE Main 2021 (Online) 18th March Morning Shift
Numerical
+4
-1
For the reaction C2H6 $$\to$$ C2H4 + H2

the reaction enthalpy $$\Delta$$rH = __________ kJ mol$$-$$1. (Round off to the Nearest Integer).

[ Given : Bond enthalpies in kJ mol$$-$$1 : C-C : 347, C = C : 611; C-H : 414, H-H : 436 ]
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