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1
JEE Main 2020 (Online) 7th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Amongst the following statements, that which was not proposed by Dalton was :
A
Matter consists of indivisible atoms all the atoms of a given element have.
B
Chemical reactions involve reorganization of atoms. These are neither created not destroyed in a chemical reaction.
C
When gases combine or reproduced in a chemical reactionn they do so in a simple ratio by volume provided all gases are the same T & P.
D
Identical properties including identical mass. Atoms of differemt element differ in mass.
2
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
25 g of an unknown hydrocarbon upon burning produces 88 g of CO2 and 9 g of H2O. This unknown hydrocarbon contains :
A
18 g of carbon and 7 g of hydrogen
B
20 g of carbon and 5 g of hydrogen
C
22 g of carbon and 3 g of hydrogen
D
24 g of carbon and 1 g of hydrogen
3
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Thermal decomposition of a Mn compound (X) at 513 K results in compound Y, MnO2 and gaseous product. MnO2 reacts with NaCl and concentrated H2O4 to give a pungent gas Z. X, Y and Z, respectively, are :
A
KMnO4, K2MnO4 and Cl2
B
K2MnO4, KMnO4 and SO2
C
K3MnO4, K2MnO4 and Cl2
D
K2MnO4, KMnO4 and Cl2
4
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
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