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1
JEE Main 2020 (Online) 4th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
An alkaline earth metal ‘M’ readily forms water soluble sulphate and water insoluble hydroxide. Its oxide MO is very stable to heat and does not have rock-salt structure. M is :
A
Ca
B
Mg
C
Sr
D
Be
2
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
3
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
4
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
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