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1
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ?
A
Ti2+
B
V2+
C
Cr2+
D
Mn2+
2
JEE Main 2017 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The pair of compounds having metals in their highest oxidation state is :
A
MnO2 and CrO2Cl2
B
[NiCl4]2$$-$$ and [CoCl4]2$$-$$
C
[Fe(CN)6]3$$-$$ and [Cu(CN)4]2$$-$$
D
[FeCl4]$$-$$ and Co2O3
3
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
4
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+
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