1
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
An organic compound is estimated through Duma's method and was found to evolve 6 moles of CO2. 4 moles of H2O and 1 mole of nitrogen gas. The formula of the compound is :
A
C6H8N
B
C6H8N2
C
C12H8N
D
C12H8N2
2
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The correct match between items I and II is :

Item-I (Mixture) Item-II (Seperation method)
(A) H2O : Sugar (P) Sublimation
(B) H2O : Aniline (Q) Recrystallization
(C) H2O : Toluene
(R) Steam distillation
(S) Differential extraction
A
A$$ \to $$(R); (B)$$ \to $$(P); (C)$$ \to $$(S)
B
A$$ \to $$(Q); (B)$$ \to $$(R); (C)$$ \to $$(S)
C
A$$ \to $$(Q); (B)$$ \to $$(P); (C)$$ \to $$(R)
D
A$$ \to $$(S); (B)$$ \to $$(R); (C)$$ \to $$(P)
3
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The freezing point of a diluted milk sample is found to be –0.2oC, while it should have been –0.5oC for pure milk. How much water has been added to pure milk to make the diluted sample?
A
1 cup of water to 2 cups of pure milk
B
2 cups of water to 3 cups of pure milk
C
3 cups of water to 2 cups of pure milk
D
1 cup of water to 3 cups of pure milk
4
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Two blocks of the same metal having same mass and at temperature T1 and T2, respectively, are brought in contact with each other and allowed to attain thermal equilibrium at constant pressure. The change in entropy, $$\Delta $$S, for this process is :
A
2Cp In $$\left[ {{{{{\left( {{T_1} + {T_2}} \right)}^{{1 \over 2}}}} \over {{T_1}{T_2}}}} \right]$$
B
2Cp In $$\left[ {{{\left( {{T_1} + {T_2}} \right)} \over {2{T_1}{T_2}}}} \right]$$
C
Cp In $$\left[ {{{{{\left( {{T_1} + {T_2}} \right)}^2}} \over {4{T_1}{T_2}}}} \right]$$
D
2Cp In $$\left[ {{{\left( {{T_1} + {T_2}} \right)} \over {4{T_1}{T_2}}}} \right]$$
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