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1.

Which of the following orbitals will not form sigma bond after overlapping ?A. s - orbital and s- orbitalB. s- orbital and `p_(z) -` orbitalC. `p_(z)`- orbital and `p_(z)-` orbitalD. `p_(x)`-orbital and `p_(x)`- orbital

Answer» Correct Answer - D
Discussion
2.

Assertion : The dipole moment in case of `BeF_(2)` is zero. Reason : The two equal bond dipoles point in opposite directions and cancel the effect of each other.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason in not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.

Answer» Correct Answer - A
Discussion
3.

In the correct Lewis dot structure of `CO_(2)`, the total number of lone pairs are :A. `:overset(..)(O)::C::overset(..)(O):`B. `:underset(..)overset(..)(O):overset(..)(C)::overset(..)(O):`C. `:overset(..)(O)::C:underset(..)overset(..)(O):`D. `:underset(..)overset(..)(O):C:underset(..)overset(..)(O):`

Answer» Correct Answer - A
Discussion
4.

In water molecule, the two O - H bonds are oriented at an angle of `104.5^(@)` . In `BF_(3),` the three B - F bonds are oriented at an angle of `120^(@)` . In `BeF_(2)`, the two Be - F bonds are oriented at an angle of `180^(@)`. Which of the following will have highest dipole moment ?A. `BeF_(2)`B. `BF_(3)`C. `H_(2)O`D. All have zero dipole moment.

Answer» Correct Answer - C
Discussion
5.

Molecular shape of `SF_(4), CF_(4)` and `XeF_(4)` areA. the same with 2, 0 and 1 lone pairs of electrons respectivelyB. the same with 1, 1 and 1 lone pairs of electrons respectivelyC. different with 0, 1 and 2 lone pairs of electrons respectivelyD. different with 1, 0 and 2 lone pairs of electrons respectively.

Answer» Correct Answer - D
Discussion
6.

Assertion : In Liwis structures of `NF_(3) and CO_(3)^(2-)`, nitrogen and carbon occupy the central position whereas fluorine and oxygen occupy the terminal positions. Reason : In Lewis representation, the least electronegative atom occupies the central position in the molecule/ion.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason in not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.

Answer» Correct Answer - A
Discussion
7.

Ethy1 alcohol `(C_(2)H_(5)OH)` has higher boiling point than dimethyl ether `(CH_(3)-O-CH_(3))` although the molecular weight of both are same .A. intramolecular H-bondingB. intermolecular H-bondingC. dipole momentD. lattice enthalpy.

Answer» Correct Answer - B
Discussion
8.

Few examples of the componds formed by chemical bonding are given below . Mark the incorrect example.A. A molecule with central atom devoid of octet - `BF_(3)`B. A molecule with linear shape - `CO_(2)`C. A non - polar covalent compound between two different atoms - `CH_(4)`D. A molecule which is V- shaped with a bond angle `104.5^(@) - NH_(3)`

Answer» Correct Answer - D
Discussion
9.

The bond between two identical nonmetal atoms has a pair of electronsA. is shifted to one of the atomsB. is shared equally between themC. undergoes addition reactionsD. have same spin.

Answer» Correct Answer - B
Discussion