1
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+
2
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Identify the incorrect statement :
A
S2 is paramagnetic like oxygen.
B
Rhombic and monoclinic sulphur have S8 molecules.
C
S8 ring has a crown shape.
D
The S-S-S bond angles in the S8 and S6 rings are the same.
3
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution?
A
Tetrachloroethylene
B
Carbon dioxide
C
Sulphur dioxide
D
Nitrogen dioxide
4
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Sodium extract is heated with concentrated HNO3 before testing for halogens because :
A
Silver halides are totally insoluble in nitric acid.
B
Ag2S and AgCN are soluble in acidic medium.
C
S2 and CN, if present, are decomposed by conc. HNO3 and hence do not interfere in the test.
D
Ag reacts faster with halides in acidic medium.
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