1
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The difference between $$\Delta $$H and $$\Delta $$U ($$\Delta $$H – $$\Delta $$U), when the combustion of one mole of heptane(l) is carried out at a temperature T, is equal to :
A
– 4 RT
B
3 RT
C
– 3 RT
D
4 RT
2
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The minimum amount of O2(g) consumed per gram of reactant is for the reaction :
(Given atomic mass : Fe = 56, O = 16, Mg = 24, P = 31, C = 12, H = 1)
A
4Fe(s) + 3O2(g) $$ \to $$ 2Fe2O3(s)
B
P4(s) + 5O2(g) $$ \to $$ P4O10(s)
C
C3H8(g) + 5O2(g) $$ \to $$ 3CO2(g) + 4H2O(l)
D
2Mg(s) + O2(g) $$ \to $$ 2MgO(s)
3
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
For the reaction,
2SO2(g) + O2(g) = 2SO3(g), $$\Delta $$H = –57.2 kJ mol–1 and KC = 1.7 × 1016
Which of the following statement is incorrect ?
A
The equilibrium will shift in forward direction as the pressure increase.
B
The addition of inert gas at constant volume will be not affect the equilibrium constant.
C
The equilibrium constant is large suggestive of reaction going to completion and so no catalyst is required.
D
The equilibrium constant decreases as the temperature increase.
4
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The pH of a 0.02 M NH4Cl solution will be :
[given Kb (NH4OH) = 10–5 and log 2 = 0.301]
A
2.56
B
5.35
C
4.35
D
4.65
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