1
JEE Main 2020 (Online) 6th September Morning Slot
+4
-1
A solution of two components containing n1 moles of the 1st component and n2 moles of the 2nd component is prepared. M1 and M2 are the molecular weights of component 1 and 2 respectively. If d is the density of the solution in g mL–1, C2 is the molarity and x2 is the mole fraction of the 2nd component, then C2 can be expressed as :
A
$${C_2} = {{1000{x_2}} \over {{M_1} + {x_2}\left( {{M_2} - {M_1}} \right)}}$$
B
$${C_2} = {{1000d{x_2}} \over {{M_1} + {x_2}\left( {{M_2} - {M_1}} \right)}}$$
C
$${C_2} = {{d{x_2}} \over {{M_1} + {x_2}\left( {{M_2} - {M_1}} \right)}}$$
D
$${C_2} = {{d{x_1}} \over {{M_1} + {x_2}\left( {{M_2} - {M_1}} \right)}}$$
2
JEE Main 2020 (Online) 3rd September Evening Slot
+4
-1
The strengths of 5.6 volume hydrogen peroxide (of density 1 g/mL) in terms of mass percentage and molarity (M), respectively, are: (Take molar mass of hydrogen peroxide as 34 g/mol)
A
0.85 and 0.5
B
0.85 and 0.25
C
1.7 and 0.25
D
1.7 and 0.5
3
JEE Main 2020 (Online) 7th January Evening Slot
+4
-1
The ammonia (NH3) released on quantitative 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
+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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