1
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Which one of the following ores is best concentrated by froth floatation method?
A
Siderite
B
Galena
C
Malachite
D
Magnetite
2
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The pair in which phosphorous atoms have a formal oxidation state of +3 is :
A
Orthophosphorous and pyrophosphorous acids
B
Pyrophosphorous and hypophosphoric acids
C
Orthophosphorus and hypophosphoric acids
D
Pyrophosphorous and pyrophosphoric acids
3
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
4
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following compounds is metallic and ferromagnetic ?
A
CrO2
B
VO2
C
MnO2
D
TiO2
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