1
JEE Main 2021 (Online) 25th February Morning Slot
MCQ (Single Correct Answer)
+4
-1
Complete combustion of 1.80 g of an oxygen containing compound (CxHyOz) gave 2.64 g of CO2 and 1.08 g of H2O. The percentage of oxygen in the organic compound is :
A
51.63
B
50.33
C
63.53
D
53.33
2
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
The average molar mass of chlorine is 35.5 g mol–1. The ratio of 35Cl to 37Cl in naturally occuring chlorine is close to :
A
1 : 1
B
2 : 1
C
3 : 1
D
4 : 1
3
JEE Main 2020 (Online) 7th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
The ammonia (NH3) released on quantiative reaction of 0.6 g urea (NH2CONH2) with sodium hydroxide (NaOH) can be neutralized by :
A
200 ml of 0.02 N HCl
B
100 ml of 0.2 N HCl
C
100 ml of 0.1 HCl
D
200 ml of 0.4 N HCl
4
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.
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