Water Quiz | Water Multiple Choice Questions and Answers

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Questions
1 What is the bond length of hydrogen bond between two water molecules in liquid water?
A 0.0177 nm
B 0.177 nm
C 1.177 nm
D 17.70 nm

Answer: 0.177 nm
2 The bond dissociation energy of O – H bond in water is:
A 470 kJ/mol
B 348 kJ/mol
C 23 kJ/mol
D 10 kJ/mol

Answer: 470 kJ/mol
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3 The life span of a hydrogen bond between two water molecule in liquid water is:
A 1 – 20 seconds
B 1 – 20 microseconds
C 1 – 20 nano-seconds
D 1 – 20 pico-seconds

Answer: 1 – 20 pico-seconds
4 Which of the following statement is correct regarding the hydrogen bonds in water?
A Hydrogen bond is 10 % covalent and 90 % electrostatic
B Hydrogen bond is 25% covalent and 75 % electrostatic
C Hydrogen bond is 50% covalent and 50% electrostatic
D Hydrogen bond is 100 % electrostatic

Answer: Hydrogen bond is 10 % covalent and 90 % electrostatic
5 The bond dissociation energy of hydrogen bonds in water molecule is
A 10 kJ / mol
B 23 kJ/mol
C 470 kJ/mol
D 348 kJ/mol

Answer: 23 kJ/mol
6 Hydrogen bond is best represented as the electrostatic attraction between:
A A hydrogen covalently bounded to an electronegative atom and another hydrogen atom
B A hydrogen covalently bounded to an electronegative atom and another electronegative atom
C Two electronegative atoms and a hydrogen atom
D Two hydrogen atoms

Answer: A hydrogen covalently bounded to an electronegative atom and another electronegative atom
7 The oxygen atom in the water molecule due to its high electronegativity bears _______
A 1 δ+ charge
B 2 δ+ charges
C 1 δ– charge
D 2 δ– charges

Answer: 2 δ– charges
8 Which of the following represent the current melting point, boiling point and heat of vaporization of water?
A 0oC ; 100oC ; 2260 J/g
B 100oC ; 0oC ; 2260 J/g
C 0oC ; 100oC ; 1260 J/g
D 100oC ; 0oC ; 1260 J/g

Answer: 0oC ; 100oC ; 2260 J/g
9 Which of the following statement is true regarding the electronegativity of atoms in water molecule?
A Hydrogen is more electronegative than oxygen
B Hydrogen is less electronegative than oxygen
C Electronegativity of hydrogen and oxygen is same
D Oxygen and hydrogen do not have significant electronegativity in water

Answer: Hydrogen is less electronegative than oxygen
10 Most important reason for the unusual properties of water is:
A The covalent bonding pattern in water molecule
B The bond angle between the two hydrogen atoms in water
C Hydrogen bonding between water molecules
D Water can be immediately ionized at room temperature

Answer: Hydrogen bonding between water molecules
11 Polar molecules can readily dissolve in water. This is because:
A Polar molecules can form hydrogen bonds with water
B Polar molecules can replace water-water interaction with more energetically favourable water-solute interactions
C Polar charged water can interact with the charge of polar molecules
D All polar molecules are amphipathic in nature

Answer: Polar molecules can replace water-water interaction with more energetically favourable water-solute interactions
12 Water is a ___
A Polar solvent
B Non polar solvent
C An amphipathic solvent
D Non polar uncharged solvent

Answer: Polar solvent
13 Water is liquid at room temperature, the most important reason for this is the:
A High boiling point of water
B High melting point of water
C High heat of vaporization of water
D Cohesive forces due to hydrogen bonds in water

Answer: Cohesive forces due to hydrogen bonds in water
14 What is the full form of BOD?
A Biochemical oxygen demand
B Biological oxygen demand
C Biometric oxygen deep water
D Biological oxygen deep water

Answer: Biochemical oxygen demand
15 The optimum value in natural water is ________
A 2-4ppm
B 4-7ppm
C 4-6ppm
D 2-7ppm

Answer: 4-6ppm
16 The ____________ is an important requirement of the aquatic life.
A Dissolved nitrogen
B Dissolved chlorine
C Dissolved oxygen
D Dissolved methane

Answer: Dissolved oxygen
17 Helminth in the water causes __________
A Hook worm
B Amoebic dysentery
C Cholera
D Typhoid

Answer: Hook worm
18 Bacteria in water causes ________
A Malaria
B Typhoid
C Dengue
D Chicken guinea

Answer: Typhoid
19 Amoebic dysentery is caused by ___________
A Viruses
B Bacteria
C Helminth
D Protozoa

Answer: Protozoa
20 Infectious hepatitis is caused by ___________
A Bacteria
B Viruses
C Protozoa
D Helminth

Answer: Viruses

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