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1
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Magnisium powder burns in air to give :
A
MgO and Mg3N2
B
MgO only
C
Mg(NO3)2 and Mg3N2
D
MgO and Mg(NO3)2
2
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The correct order of hydration enthapies of alkali metal ions is :
A
Li+ > Na+ > Cs+ > Rb+
B
Na+ > Li+ > K+ > Cs+ > Rb+
C
Na+ > Li+ > K+ > Rb+ > Cs+
D
Li+ > Na+ > K+ > Rb+ > Cs+
3
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
A metal on combustion in excess air forms X. X upon hydrolysis with water yields H2O2 and O2 along with another product. The metal is :
A
Rb
B
Mg
C
Na
D
Li
4
JEE Main 2019 (Online) 11th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The reaction that does NOT define calcination is :
A
2Cu2S + 3O2 $$\buildrel \Delta \over \longrightarrow $$ 2Cu2O + 2SO2
B
CaCO3 . MgCO3 $$\buildrel \Delta \over \longrightarrow $$ CaO + MgO + 2CO2
C
ZnCO3 $$\buildrel \Delta \over \longrightarrow $$ ZnO + CO2
D
Fe2O3 . XH2O $$\buildrel \Delta \over \longrightarrow $$ Fe2O3 + XH2O
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