1
WB JEE 2021
MCQ (Single Correct Answer)
+2
-0.5
Change Language
5.75 mg of sodium vapour is converted to sodium ion. If the ionisation energy of sodium is 490 kJ mol$$-$$1 and atomic weight is 23 units, the amount of energy needed for this conversion will be
A
1.96 kJ
B
1960 kJ
C
122.5 kJ
D
0.1225 kJ
2
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Which of the following statements is not true for the reaction, 2F2 + 2H2O $$ \to $$ 4HF + O2 ?
A
F2 is more strongly oxidising than O2
B
F $$ - $$F bond is weaker than O = O bond
C
H $$ - $$F bond is stronger than H$$ - $$O bond
D
F is less electronegative than O
3
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.33
Change Language
The second ionization energy of the following elements follows the order
A
Zn > Cd < Hg
B
Zn > Cd > Hg
C
Cd > Hg < Zn
D
Zn < C < Hg
4
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.33
Change Language
The melting points of (i) BeCl2 (ii) CaCl2 and (iii) HgCl2 follows the order
A
i < ii < iii
B
iii < i < ii
C
i < iii < ii
D
ii < i < iii
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