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1
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Which one of the following is an oxide?
A
KO2
B
BaO2
C
SiO2
D
CsO2
2
JEE Main 2017 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Consider the following ionization enthalpies of two elements 'A' and 'B' .

Element Ionization enthalpy (kJ/mol)
1st 2nd 3rd
A 899 1757 14847
B 737 1450 7731


Which of the following statements is correct ?
A
Both ‘A’ and ‘B’ belong to group-1where ‘B’ comes below ‘A’.
B
Both ‘A’ and ‘B’ belong to group-1 where ‘A’ comes below ‘B’.
C
Both ‘A’ and ‘B’ belong to group-2 where ‘B’ comes below ‘A’.
D
Both ‘A’ and ‘B’ belong to group-2 where ‘A’ comes below ‘B’.
3
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The following statements concern elements in the periodic table. Which of the following is true ?
A
All the elements in Group 17 are gases.
B
The Group 13 elements are all metals.
C
Elements of Group 16 have lower ionization enthalpy values compared to those of Group 15 in the corresponding periods.
D
For Group 15 elements, the stability of + 5 oxidation state increases down the group.
4
JEE Main 2015 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
The ionic radii (in Å) of N3–, O2– and F– are respectively:
A
1.36, 1.71 and 1.40
B
1.71, 1.40 and 1.36
C
1.71, 1.36 and 1.40
D
1.36, 1.40 and 1.71
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