1
JEE Main 2020 (Online) 6th September Evening Slot
+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
2
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
$${C_2} = {{d{x_1}} \over {{M_1} + {x_2}\left( {{M_2} - {M_1}} \right)}}$$
3
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
4
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
EXAM MAP
Medical
NEET