1
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
On combustion of Li, Na and K in excess of air, the major oxides formed, respectively, are :
A
Li2O, Na2O2 and K2O
B
Li2O2, Na2O2 and K2O2
C
Li2O, Na2O2 and KO2
D
Li2O, Na2O and K2O2
2
JEE Main 2020 (Online) 2nd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Two elements A and B have similar chemical properties. They don’t form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are
A
Li and Mg
B
Cs and Ba
C
Na and Rb
D
Na and Ca
3
JEE Main 2020 (Online) 2nd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
The metal mainly used in devising photoelectric cells is :
A
Na
B
Rb
C
Li
D
Cs
4
JEE Main 2020 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Among the statements (a)-(d) the correct ones are:

(a) Lithium has the highest hydration enthalpy among the alkali metals.

(b) Lithium chloride is insoluble in pyridine.

(c) Lithium cannot form ethynide upon its reaction with ethyne.

(d) Both lithium and magnesium react slowly with H2O.
A
(b) and (c) only
B
(a) and (d) only
C
(a), (b) and (d) only
D
(a), (c) and (d) only
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