1
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
For a reaction,
4M(s) + nO2(g) $$ \to $$ 2M2On(s)
the free energy change is plotted as a function of temperature. The temperature below which the oxide is stable could be inferred from the plot as the point at which :
A
the free energy change shows a change from negative to positive value
B
the slope changes from positive to negative
C
the slope changes from negative to positive
D
the slope changes from positive to zero
2
JEE Main 2020 (Online) 5th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Lattice enthalpy and enthalpy of solution of NaCl are 788 kJ mol–1, and 4 kJ mol–1, respectively.
The hydration enthalpy of NaCl is :
A
–780 kJ mol–1
B
–784 kJ mol–1
C
780 kJ mol–1
D
784 kJ mol–1
3
JEE Main 2020 (Online) 4th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
The process that is NOT endothermic in nature is :
A
Ar(g) + e- $$ \to $$ Ar-(g)
B
H(g) + e- $$ \to $$ H-(g)
C
Na(g) $$ \to $$ Na+(g) + e-
D
O-(g) + e- $$ \to $$ O2-(g)
4
JEE Main 2020 (Online) 4th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Five moles of an ideal gas at 1 bar and 298 K is expanded into vacuum to double the volume. The work done is :
A
Zero
B
-RT $$\ln {{{V_2}} \over {{V_1}}}$$
C
CV (T2 – T1)
D
– RT (V2 – V1)
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