1
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In which of the following process, the bond order has increased and paramagnetic character has charged to diamagnetic ?
A
NO $$ \to $$ NO+
B
N2 $$ \to $$ N2+
C
O2 $$ \to $$ O2+
D
O2 $$ \to $$ O22$$-$$
2
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
When the first electron gain enthalpy $$\left( {{\Delta _{eg}}H} \right)$$ of oxygen is $$-$$ 141 kJ/mol, its second electron gain enthalpy is :
A
a more negative value than the first
B
almost the same as that of the first
C
negative, but less negative than the first
D
a positive value
3
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The transition element that has lowest enthalpy of atomisation, is :
A
Fe
B
Cu
C
V
D
Zn
4
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
At 100oC, copper (Cu) has FCC unit cell structure with cell edge length of x $$\mathop A\limits^o $$. What is the approximate density of Cu (in g cm$$-$$3) at this temperature?
[Atomic Mass of Cu = 63.55 u]
A
$${{205} \over {{x^3}}}$$
B
$${{105} \over {{x^3}}}$$
C
$${{211} \over {{x^3}}}$$
D
$${{422} \over {{x^3}}}$$
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