Take NA as the number of Anti-bonding molecular orbitals and NB as the number of Bonding molecular orbitals. The molecule is stable when NA ____________ NB.

The band structure in an n-type semiconductor is
Chemical Bonding and Molecular Structure mcq question image

A

I

B

II

C

III

D

IV

Study information given and select valid conclusion/s from the given statements based on it. In a joint family the number of members who take only coffee is equal to the half the number of members who take tea and the number of persons who take only tea is equal to the half the number of persons who take coffee. Statements: a. The total number of persons who take either coffee or tea or both is thrice the number of persons who take only coffee or only tea. b. The total number of persons who take only coffee and those who take only tea is twice the number of persons who take both coffee and tea.

A

Only b

B

Neither a and b

C

Both a and b

D

Only a

In a diatomic molecule, the inter-nuclear separation of the ground and first excited electronic state are the same as shown in the figure. If the molecule is initially in the lowest vibrational state of the ground state, then the absorption spectrum will appear as
Atomic and Molecular Physics mcq question image

Atomic and Molecular Physics mcq question image

A

B

C

D

An Investigator interviewed 100 students to determine the performance of three drinks milk, coffee and tea. The investigator reported that 10 students take all three drinks, 20 students take milk and coffee, 30 students take coffee and tea; 25 students take milk and tea; 12 students take milk only. 5 students take coffee only and 8 student take tea only. Then the number of students who did not take any of the three drinks is λ. The value of \(\frac{\lambda }{4}\) is equal to

A

2

B

3

C

4

D

5

The number of electrons in bonding orbital and anti-bonding orbital of Lithium molecule are ______ and _______ respectively.

A

4, 4

B

2, 2

C

2, 4

D

4, 2

Combination of two atomic orbitals results in the formation of two molecular orbitals namely _________

A

one bonding and one non-bonding orbital

B

two bonding orbitals

C

two non-bonding orbitals

D

two bonding and non-bonding orbitals

Consider the following statements: 1. DNA contains the sugar deoxyribose, while RNA contains the sugar ribose. 2. DNA is a double-stranded molecule, while RNA is a single-stranded molecule. 3. DNA is not stable under alkaline conditions, while RNA is stable. Which of the given above statements is/are correct?

A

1 and 2

B

2 only

C

2 and 3

D

1, 2 and 3

Which of the following is the correct order for bonding energies of molecular orbitals?

A

σ1s < σ2s < σ*2s < σ*1s

B

σ1s < σ2s < σ*1s < σ*2s

C

σ1s < σ*1s < σ2s < σ*2s

Sigma molecular orbitals are not symmetrical around the bonding axis.

A

True

B

False

Atoms in one molecule bonding to atom in another molecule are called ____________

A

Primary valence bond

B

Secondary valence bond

C

Hydrogen bond

D

Electrostatic bond

Take NA as the number of Anti-bonding molecular orbitals and NB as the number of Bonding molecular orbitals. The molecule is stable when NA ____________ NB.

Related Questions