1
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
In the following reactions, ZnO is respectively acting as a/an :

(a) ZnO + Na2O $$\to$$ Na2ZnO2

(b) ZnO + CO2 $$\to$$ ZnCO3
A
base and base
B
acid and acid
C
acid and base
D
base and acid
2
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The transition metal ions responsible for color in ruby and emerald are, respectively :
A
Cr3+   and   Co3+
B
Co3+    and    Cr3+
C
Co3+    and    Co3+
D
Cr3+    and    Cr3+
3
JEE Main 2016 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Which one of the following species is stable in aqueous solution?
A
Cr2+
B
Cu+
C
MnO$$_4^{3 - }$$
D
MnO$$_4^{2 - }$$
4
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
The reaction of zinc with dilute and concentrated nitric acid, respectively, produces :
A
NO2 and NO
B
NO and N2O
C
NO2 and N2O
D
N2O and NO2
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