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Free download in PDF Water Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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
(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
(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
(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
(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
(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
(16)
The ____________ is an important requirement of the aquatic life.
[A]
Dissolved nitrogen
[B]
Dissolved chlorine
[C]
Dissolved oxygen
[D]
Dissolved methane
(17)
Helminth in the water causes __________
[A]
Hook worm
[B]
Amoebic dysentery
[C]
Cholera
[D]
Typhoid
(18)
Bacteria in water causes ________
[A]
Malaria
[B]
Typhoid
[C]
Dengue
[D]
Chicken guinea
(19)
Amoebic dysentery is caused by ___________
[A]
Viruses
[B]
Bacteria
[C]
Helminth
[D]
Protozoa
(20)
Infectious hepatitis is caused by ___________
[A]
Bacteria
[B]
Viruses
[C]
Protozoa
[D]
Helminth
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