Chemical Bonding — Set 1
Chemistry · रासायनिक बंधन · Questions 1–10 of 40
Which type of bond is formed by the complete transfer of one or more electrons from one atom to another?
Correct Answer: D. Ionic bond
An ionic bond is formed when one atom loses electrons to another atom. This usually occurs between a metal and a non-metal with high electronegativity difference. Sodium chloride is a classic example of this type of bonding.
What is the bond angle in a molecule of methane (CH4)?
Correct Answer: C. 109.5 degrees
The bond angle in methane is 109.5 degrees because of its tetrahedral geometry. This shape minimizes the repulsion between the four pairs of bonding electrons. Methane is the simplest alkane found in natural gas.
Which of the following molecules contains a triple bond?
Correct Answer: A. Nitrogen
A nitrogen molecule contains a triple bond between two nitrogen atoms. Each atom shares three pairs of electrons to achieve a stable octet. This strong triple bond makes nitrogen gas relatively inert in the atmosphere.
The weak attractive force between non-polar molecules is known as?
Correct Answer: A. London dispersion force
London dispersion forces are the weakest intermolecular forces occurring between all molecules. They arise from temporary dipoles created by the movement of electrons. These forces are the only ones present in noble gases like Helium.
Which geometry is associated with a molecule having sp hybridisation?
Correct Answer: D. Linear
Molecules with sp hybridisation always exhibit a linear geometry. The bond angle between the atoms in such a configuration is exactly 180 degrees. Beryllium chloride (BeCl2) is a typical example of this linear shape.
Which of these substances has the highest melting point due to a giant covalent network?
Correct Answer: B. Diamond
Diamond has an extremely high melting point because of its 3D network of strong covalent bonds. Each carbon atom is bonded to four other carbons in a rigid structure. This makes diamond the hardest naturally occurring substance known.
What type of bond is found between water molecules that explains its high boiling point?
Correct Answer: C. Hydrogen bond
Hydrogen bonding occurs between the hydrogen of one water molecule and the oxygen of another. This attraction is stronger than standard dipole-dipole interactions found in similar sized molecules. It is responsible for water being liquid at room temperature.
The sharing of electrons between atoms of similar electronegativity results in which bond?
Correct Answer: C. Covalent bond
A covalent bond is formed by the mutual sharing of electron pairs between atoms. This typically happens between two non-metals that need electrons to complete their outer shells. Carbon dioxide is an example of a molecule held by covalent bonds.
Which molecule shows a 'bent' or 'V-shape' geometry due to lone pair repulsion?
Correct Answer: C. Water
Water has a bent shape because its two lone pairs of electrons repel the bonding pairs. This repulsion reduces the bond angle to approximately 104.5 degrees. VSEPR theory is used to predict these molecular geometries.
In a coordinate covalent bond, how many atoms contribute the shared pair of electrons?
Correct Answer: A. One atom
In a coordinate bond, both shared electrons come from a single atom. This type of bonding is also known as a dative covalent bond. It is commonly observed in the formation of the ammonium ion (NH4+).