The electronic configuration is 1s² 2s² 2p⁵ 3s¹  shows

• ground state of fluorine atom

• excited state of fluorine atom

• excited state of neon atom

• excited state of ion O₂

Assertion : B₂H₆, Si₂H₆, are said to have similar structure.

Reason : They have same number of $\mathrm{\sigma }$ and $\mathrm{\pi }$ bonds.

• If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

• If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

• If Assertion is true but Reason is false.

• If Assertion is false but Reason is true.

Assertion: Sigma ($\mathrm{\sigma }$) is a strong bond, while pi ($\mathrm{\pi }$) is a weak bond.
Reason: Atoms rotate freely about the pi ($\mathrm{\pi }$) bond.

• If both assertion and reason are true and the reason is a correct explanation of the assertion.

• If both the assertion and reason are true but the reason is not a correct explanation of the assertion.

• If the assertion is true but the reason is false.

• If both the assertion and reason are false.

The correct order of decreasing H-C-H angle in the following molecule is

• I > II > III

• II > I > III

• III > II > I

• I > III > II

The state of hybridization of the central atom and the number of lone pairs over the central atom in POCl₃
are:

• sp , 0

• sp² , 0

• sp³ , 0

• dsp² , 1

The compound that will have a permanent dipole moment among the following is

• I

• II

• III

• IV

The correct order of decreasing length of the bond as indicated by the arrow in the following structures is

• I > II > III

• II > I > III

• III > II > I

• I > III > II

878.

In case of heteronuclear diatomics of the type AB, where A is more electronegative than B, bonding molecular orbital resembles the character of A more than that of B. The statement 

• is false

• is true

• cannot be evaluated since data is not sufficient

• is true only for certain systems

Dipole-induced dipole interactions are present in which of the following pairs?

• H₂O and alcohol

• Cl₂ and CCl₄

• HCl and He atoms

• SiF₄ and He atoms

Which of  the following structure is similar to graphite?

• CO

• O₂^-

• CN^-

• NO⁺