1
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
What would be the molality of 20% (mass/ mass) aqueous solution of KI?
(molar mass of KI = 166 g molā€“1)
A
1.51
B
1.35
C
1.08
D
1.48
2
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The correct order of the oxidation states of nitrogen in NO, N2O, NO2 and N2O3 is :
A
NO2 < NO < N2O3 < N2O
B
NO2 < N2O3 < NO < N2O
C
N2O < NO < N2O3 < NO2
D
N2O < N2O3 < NO < NO2
3
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
For a reaction,
N2(g) + 3H2(g) $$ \to $$ 2NH3(g) ;
identify dihydrogen (H2) as a limiting reagent in the following reaction mixtures.
A
56g of N2 + 10g of H2
B
14g of N2 + 4g of H2
C
28g of N2 + 6g of H2
D
35g of N2 + 8g of H2
4
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
The percentage composition of carbon by mole in methane is :
A
80%
B
20%
C
75%
D
25%
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