Isostructural species are those which have the same shape

Question

CHEMICAL BONDING

MCQ Questions

Isostructural species are those which have the same shape and hybridization. Among the given species identify the isostructural pairs.

[NF₃ and BF₃]
[BF₄- and NH₄+]
[BCl3 and BrCl₃]
[NH₃ and NO₃-]

Polarity in a molecule and hence the dipole moment depends primarily on electronegativity of the constituent atoms and shape of a molecule. Which of the following has the highest dipole moment?

CO₂
HI
H₂O
SO₂

3. The types of hybrid orbitals of nitrogen in NO2+ , NO3- and  NH4+ respectively are expected to be. 

i) sp, sp³ and sp²
ii) sp, sp² and sp³
iii) sp², sp and sp³
iv) sp², sp³ and  sp

4. Hydrogen bonds are formed in many compounds e.g. H2O, HF ,NH3. The boiling point of such compounds depends to a large extent on the strength of hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points of above compounds is:

i) HF> H₂O>NH₃
ii)H₂O >HF> NH₃
iii) NH₃>HF>H₂O
iv) NH3  >H2O >HF

5. In PO₄^3- ion the formal charge on the oxygen atom of P-O bond is

i) +1
ii) -1
iii) -0.75
iv) 0.75

6. In NO₃^- ion, the number of bond pairs and the lone pairs of electrons on nitrogen atom are

i) BH₄-
ii) NH₂-
iii) CO₃^2-
iv)  H₃O+

7. Which of the following species has tetrahedral geometry?

i) BH₄-
ii) NH₂-
iii) CO₃^2-
iv) H₃O+

8. Number of π bonds and σ bonds in the  following structure is :

i) 6, 19
ii) 4 , 20
iii) 5, 19
iv) 5, 20

9. Which molecule or ion out of the following does not contain unpaired electrons?

i) N₂+
ii)O₂
iii) O₂^2-
iv) B₂

10. In which of the following molecule or ion all the bonds are not equal?

i) XeF₄
ii)BF₄-
iii) C₂H₄
iv) SiF₄