This set of Food Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Structure of Water and Ice”.
1. At what temperature does water reaches its highest density?
a) 67°C
b) 52°C
c) 36°C
d) 4°C
View Answer
Explanation: As water cools, its molecular motion slows and the molecules move gradually closer to one another. When temperature decreases the density of any liquid increases, and its solid state is denser than its liquid state. But water behaves differently it reaches its highest density at 4°C.
2. State true or false: Ice does not sink, liquid water remains under the ice all winter long.
a) True
b) False
View Answer
Explanation: Ice does not sink liquid water remains under ice all winter long. If ice where to sink as it froze, entire lake would freeze solid.
3. What type of bond is formed when two hydrogen atoms share an electron with an oxygen atom?
a) Ionic bond
b) Triple bond
c) Covalent bond
d) Interstitial interaction
View Answer
Explanation: Water is a molecule that contains two hydrogen atoms each sharing a pair of electron with an oxygen atom, and then a covalent bond is created. These bonds are essential to living organisms.
4. In water molecule, the positive end of one hydrogen is attracted to the negative end of the other hydrogen atom. Name the type of attraction?
a) Hydrogen bond
b) Ionic bond
c) Molecular bond
d) Covalent bond
View Answer
Explanation: Positive and negative charges attract each other, the polar water molecules align when they approach each other. This type of attraction is called a hydrogen bond.
5. What type of bond helps water to maintain its liquid property?
a) Ionic bond
b) Weak hydrogen bond
c) Strong hydrogen bond
d) Weak covalent bond
View Answer
Explanation: Water molecules are loosely bound to each other by weak hydrogen bond, which gives water its liquid property. If the hydrogen bonds where stronger water would be rigid rather than a fluid.
6. Which quality of water helps them to work against the force of gravity?
a) Weak hydrogen bond
b) Covalent bond
c) Cohesion and adhesion
d) Ionic bond
View Answer
Explanation: Cohesion and adhesion are strong enough to work against the force of gravity. It allows water to move to the top of a tree which is hundreds of feet high. This movement is called capillary action.
7. What is the coordination number of ice at 0°C?
a) 4
b) 8
c) 5
d) 6
View Answer
Explanation: Ice has a coordination number of 4 at zero degree celcius, with a nearest distance of 2.76A°.
8. Each water molecule is surrounded by how many neighboring molecules?
a) 5
b) 6
c) 2
d) 4
View Answer
Explanation: Each water molecule is surrounded by four neighboring water molecule. Two of these are hydrogen bonded to the oxygen atom on the central water molecules.
Sanfoundry Global Education & Learning Series – Food Chemistry.
To practice all areas of Food Chemistry, here is complete set of Multiple Choice Questions and Answers.
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