1
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
5 moles of AB2 weigh 125 × 10–3 kg and 10 moles of A2B2 weigh 300 × 10–3 kg. The molar mass of A (MA) and molar mass of B (MB) in kg mol are:
A
MA = 10 × 10–3 and MB = 5 × 10–3
B
MA = 25 × 10–3 and MB = 50 × 10–3
C
MA = 5 × 10–3 and MB = 10 × 10–3
D
MA = 50 × 10–3 and MB = 25 × 10–3
2
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
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 Morning Slot
MCQ (Single Correct Answer)
+4
-1
At 300 K and 1 atmospheric pressure, 10 mL of a hydrocarbon required 55 mL of O2 for complete combustion, and 40 mL of CO2 is formed. The formula of the hydrocarbon is :
A
C4H7Cl
B
C4H6
C
C4H8
D
C4H10
4
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 mol–1)
A
1.51
B
1.35
C
1.08
D
1.48
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