1
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

In acetylene molecule, between the carbon atoms there are

A
three $$\sigma$$-bonds
B
two $$\sigma$$ and one $$\pi$$-bond
C
one $$\sigma$$ and two $$\pi$$-bonds
D
three $$\pi$$-bonds
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

During the formation of a chemical bond

A
energy decreases
B
energy increases
C
energy of the system does not change
D
electron-electron repulsion becomes more than the nucleus-electron attraction
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

For a stable molecule the value of bond order must be

A
negative
B
positive
C
zero
D
there is no relationship between stability and bond order
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

The number of antibonding electron pairs in O$$_2^{2-}$$ molecular ion on the basis of molecular orbital theory is

[Atomic number of O is 18]

A
2
B
3
C
4
D
5
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