1
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?
A
CuCl2
B
AgCl
C
ZnCl2
D
Cu2Cl2
2
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Which one of the following methods is most suitable for preparing deionized water?
A
Synthetic resin method
B
Clark's method
C
Calgon's method
D
Permutit method
3
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
The number of neutrons and electrons, respectively, present in the radioactive isotope of hydrogen is :
A
1 and 1
B
3 and 1
C
2 and 1
D
2 and 2
4
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
To an aqueous solution containing ions such as Al3+, Zn2+, Ca2+, Fe3+, Ni2+, Ba2+ and Cu2+ was added conc. HCl, followed by H2S.

The total number of cations precipitated during this reaction is/are :
A
1
B
3
C
4
D
2
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