The diamagnetic species is

• [Ni(CN)₄]^2-

• [NiCl₄]^2-

• [CoCl₄]^2-

• [CoF₆]^2-

In diborane, the two H - B - H angles are nearly

• 60°, 120°

• 95°, 120°

• 95°, 150°

• 120°, 180°

The bond order of O₂⁺ is the same as in :

• N₂⁺

• CN^-

• CO

• NO⁺

What type of hybridisation takes place in the N atom of NH₃ ?

• sp²

• sp³

• dsp²

• sp

Assertion : Molecular nitrogen is less reactive than molecular oxygen.

Reason : The bond length of N₂ is shorter than that of oxygen.

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

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

• If assertion is true, but reason is false.

• Both assertion and reason are false statements.

Assertion : Potassium ferrocyanide is diamagnetic whereas potassium ferricyanide is paramagnetic.

Reason : Crystal field splitting in ferrocyanide ion is greater than that of ferricyanide ion.

• 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 both assertion and reason are false.

Assertion : SeCl₄ does not have a tetrahedral structure.

Reason : Se in SeCl₄ has two lone pairs.

• 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 both assertion and reason are false.

Assertion : B₂ molecule is diamagnetic.

Reason : The highest occupied molecular orbital is of σ type.

• 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 both assertion and reason are false.

849.

The paramagnetic species is

• KO₂

• SiO₂

• TiO₂

• BaO₂

The ion which is not tetrahedral in shape is

• BF₄^-

• NH₄⁺

• Cu(NH₃)₄²⁺

• NiCl₄^2-