Part 2 Q3 Examination Advanced Chemistry 2022-23

Bond energy refers to the ___.

• A. energy required to make a mole of a compound.

• B. energy required to break a mole of a compound.

• C. energy required to carry out sublimation.

In a molecule, the atom that holds other atoms is called the _____ atom while the atoms attached to it are called _____ atoms.

• central, lone

• central, bonded

• bonded, central

• lone, bonded

What geometry or shape of the molecule results from the utilization of sp3 hybrids?

• linear

• planar

• triangular

• tetrahedral

Why do lone pairs have a greater repelling power than bonding pairs?

• They are nearer the nucleus of the central atom.

• They need to be shared with other atoms.

• Electrons in a lone pair are less excited.

• Lone pairs occupy less space than bonding electron pairs.

Bond angles of 120 degrees would be expected of covalent bonds formed from what hybrids?

• sp

• sp2

• sp3

• sp4

What is the bond angle of atoms in a molecule which is sp hybridized?

• 109.5 degrees

• 120 degrees

• 180 egrees

• 90 degrees

How many pi bonds are there in sp2-sp2 hybrid orbitals?

• 3

• 2

• 1

• 0

In a molecule, the atom that holds other atoms is called the ____.

• lone pair

• bonded atom

• central atom

• core atom

Bond energy increases as bond length decrease.

• TRUE

• FALSE

Bond angles of 120° would be expected of covalent bonds formed from ___ hybrids.

• sp

• sp3

• sp4

• sp2