521.

Assertion : NF₃ is a weaker ligand than N(CH₃)₃.

Reason : NF₃ ionizes to give F^- ions in aqueous solution.

• 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: All the hydrogen atoms in CH₄=C=CH₂ lie in one plane.

Reason : All the carbon atoms in its are sp² hybridized.

• 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.

The structure of IF₅ can be best described as :

• 

• 

• 

• None of these

The percentage of p-character in the orbitals forming P-P bond in P₄ is :

• 25

• 33

• 50

• 75

Bond dissociation energy of CH₄ is 360 kJ/mol and C₂H₆ is 620 kJ/mol. Then bond dissociation energy of C-C bond is

• 170 kJ/mol

• 50 kJ/mol

• 80 kJ/mol

• 220 kJ/mol

Total number of antibonding electrons present in O₂ will be

• 6

• 8

• 4

• 2

In BF₃, the B - F bond length is 1.30Å, when BF₃ is allowed to be treated with Me₃N, it forms an adduct, Me₃N $\to$ BF₃, the bond length of B - F in the adduct is

• greater than 1.30 Å

• smaller than 1.30 Å

• equal to 1.30 Å

• none of these

A double bond connecting two atoms .There is a sharing of :

• 2 electrons

• 1 electron

• 4 electrons

• All electrons

Structure of (SiO₄)^4- ion is :

• tetrahedral

• square planar

• octahedral

• planar triangular

The linear molecule is :

• CH₃

• C₂H₂

• NH₃

• H₂O