This set of Food Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Association of Water Molecules”.
1. What is the electrical conductivity of pure water at 25°c?
a) 0.05501±0.0001
b) 0.2568±0.2369
c) 0.2589±0.3692
d) 0.589±6398
View Answer
Explanation: In pure water, equipments detect an electrical conductivity of 0.05501±0.0001. In the absence of dissolved ions the electrolisation of water becomes slower.
2. How atoms and molecules are affected by heat?
a) The molecules and atoms vibrate slower
b) No change in molecules
c) The molecules and atoms vibrate faster
d) Space between atoms decreases
View Answer
Explanation: When heat is added to a substance, the molecules and atoms vibrate faster. As the atoms vibrate faster the space between them increases.
3. Which one is a polar molecule?
a) Water
b) Methane gas
c) Toluene
d) Nitrogen
View Answer
Explanation: When a molecule has partial positive and partial negative charges they are called polar molecules. Water is a polar molecule since it has slight positive charge on one and slight negative on the other.
4. What is the bond angle of a water molecule?
a) 104.5°
b) 102.36°
c) 32.56°
d) 96.32°
View Answer
Explanation: The two hydrogen atom remains close to the oxygen atom. It exerts a stronger repulsion against the two covalent bonding pairs, resulting in a H-O-H bonding angle of 104.5°
5. What is the structural hybridization of water molecule?
a) Trigonal pyramidal
b) Tetradedral
c) Linear
d) Bent
View Answer
Explanation: The water molecules are tetrahedrally arranged, sp3 hybridized electron pairs two of which are associated to covalent bonds to the hydrogen atom leaving the remaining two lone pairs.
6. Name the ability of matrix of a molecule to entrap large amount of water in a manner such that exudition is prevented?
a) Water binding capacity
b) Water holding capacity
c) Intermolecular interaction
d) Hydration
View Answer
Explanation: Water binding capacity is the tendency of water to associate with hydrophilic substances. Water holding capacity is the ability of matrix of a molecule to entrap large amount of water in a manner such that exudition is prevented.
7. Name the tendency of water to associate with hydrophilic substances?
a) Water binding capacity
b) Water holding capacity
c) Intermolecular interaction
d) Hydration
View Answer
Explanation: Water binding capacity is the tendency of water to associate with hydrophilic substances. Water holding capacity is the ability of matrix of a molecule to entrap large amount of water in a manner such that exudition is prevented.
Sanfoundry Global Education & Learning Series – Food Chemistry.
To practice all areas of Food Chemistry, here is complete set of Multiple Choice Questions and Answers.
