Problem 49
The geometrical arrangement and shape of \(\mathrm{I}_{3}\) are respectively (1) trigonal bipyramidal geometry, linear shape (2) hexagonal geometry, T-shape (3) triangular planar geometry, pyramidal shape (4) tetrahedral geometry, pyramidal shape
Problem 50
The bond angles of \(\mathrm{N} 1 \mathrm{I}_{3}, \mathrm{NlI}_{4}\) and \(\mathrm{NII}_{2}\) are in the order (1) \(\mathrm{NII}_{2}^{-}>\mathrm{NII}_{3}>\mathrm{NII}_{4}^{+}\) (2) \(\mathrm{NII}_{4}^{+}>\mathrm{NII}_{3}>\mathrm{NII}_{2}^{-}\) (3) \(\mathrm{NII}_{3}>\mathrm{NII}_{2}>\mathrm{NII}_{4}^{-}\) (4) \(\mathrm{NII}_{3}>\mathrm{NII}_{4}^{+}>\mathrm{NII}_{2}^{-}\)
Problem 52
A covalent bond is formed between the atoms by the overlapping of orbitals containing (1) a single electron (2) paired electron (3) single electrons with parallel spin (4) single electron with opposite spin
Problem 53
How many \(\sigma\) and \(\pi\) bonds are there in the molecule of tetracyanoethylene \((\mathrm{CN})_{2} \mathrm{C}=\mathrm{C}(\mathrm{CN})_{2} ?\) (1) Nine \(\sigma\) and nine \(\pi\) (2) Five \(\sigma\) and nine \(\pi\) (3) Nine \(\sigma\) and seven \(\pi\) (4) Five \(\sigma\) and eight \(\pi\)
Problem 55
Which is not characteristic of a \(\pi\) bond? (1) A \(\pi\) -bond is formed when a sigma bond is already formed. (2) \(\pi\) -bonds are formed by hybrid orbitals. (3) \(\pi\) -bonds may be formed by the overlapping of atomic orbitals. (4) \(\pi\) -bond results from lateral overlap of atomic orbitals.
Problem 58
According to valence bond theory bond angle in water should be \(90^{\circ} .\) But experimental value is \(104.5^{\circ}\). This is due to (1) repulsion between positively charged hydrogen atoms (2) the presence of lone pair of electrons in oxygen (3) repulsion between two bonds is very high (4) None
Problem 59
The number of bonds present and the number of unpaired electrons according to valence bond theory in \(\mathrm{O}_{2}\) are (1) 2,2 (2) 2,0 (3) 3,0 (4) 0,2
Problem 61
Valence bond theory of Pauling and Slater accounts for \(\ldots \ldots \ldots\) characteristics of covalent bond. (1) strength (2) directional (3) both (4) none of these
Problem 62
Which orbital is used by oxygen atom to form a sigma bond with other oxygen atom in \(\mathrm{O}_{2}\) molecule? (1) sp hybrid orbital (2) \(\mathrm{sp}^{2}\) hybrid orbital (3) \(\mathrm{sp}^{3}\) hybrid orbital (4) pure p-orbital
Problem 63
Jodine monochloride molecule is formed by the overlap of (1) s-s orbitals (2) s-p orbitals (3) p-d orbitals (4) \(\mathrm{p}-\mathrm{p}\) orbitals
