Tag: structure and properties of water

Questions Related to structure and properties of water

Which property of water make it easy to contaminate and difficult to purify?

chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

  1. Water is a universal solvent

  2. Tendency to dissolve a large number of substances

  3. Both A and B

  4. None of the above

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Correct Option: C
Explanation:

The property of water make it easy to contaminate and difficult to purify is its tendency to dissolve a large number of substances. The ocean/sea water is not fit for drinking and washing because it contains high concentration of the dissolved salts.

Why water is called an universal solvent?

chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

  1. Because plants use water for taking minerals from the soil

  2. Water can dissolve a wide variety of substances

  3. Water is clear and transparent

  4. None of the above

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Correct Option: B
Explanation:

Water can dissolve a wide variety of substances the is why water is known as universal solvent. Plant use this property of water for taking minerals from the soil.

Pure water has the maximum density at $ 4^{\circ} C.$

chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

  1. True

  2. False

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Correct Option: A
Explanation:

Pure water has maximum density at $4^oC$. When we heat water from $0^oC$, its density increases up to $4^oC$ then density decreases. (Anomalous expansion of water)

Which one of the following is not a physical property of water?

chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

  1. Water has low specific heat capacity

  2. It expands on cooling

  3. It is odorless and tasteless

  4. The boiling point of water is $100^\circ C$

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Correct Option: A
Explanation:

Water has high specific heat capacity. The other options are physical properties of water.

Which of the following types of water is not in its free state?

chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

  1. River water

  2. Well water

  3. Distilled water

  4. Rain water

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Correct Option: C
Explanation:

Distilled water is purified water free of all dissolved salts. River, well and rain water is water in free state as collected in nature.

What is the molecular weight of water?

chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

  1. 21

  2. 18

  3. 20

  4. 16

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Correct Option: B
Explanation:

The atomic masses of O and H are 16 g/mol and 1 g/mol respectively.
The molecular formula of water is $H _2O$ and its molecular weight $2(1) + 16=18$ g/mol.
Note:
Water is one of the most precious resources on earth and is necessary for all living beings. We use water for different purposes like drinking, cooking, bathing, washing and many more activities. Pure water is colorless, odorless and tasteless.

When water is cooled it contracts until it reaches ________ and then it starts expanding.

chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

  1. $37$

  2. $40$

  3. $0$

  4. $4$

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Correct Option: D
Explanation:

At $4^oC$ the density of water is maximum and volume of water is minimum.

Which one of the following property is high in the case of water?

chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

  1. Surface tension

  2. Specific heat

  3. Heat of vaporization and heat of fusion

  4. All of the above

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Correct Option: D
Explanation:
Physical properties of water
1.Boiling Point and Freezing Point.
2.Surface Tension, Heat of 3.Vaporization, and Vapor Pressure.
4.Viscosity and Cohesion.
5.Solid State.
6.Liquid State.
7.Gas State.
8.High specific heat capacity.

At 4$^{\circ}$C, water starts expanding and continues to do so till 0$^{\circ}$C.

Is the above statement correct?

chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

  1. True

  2. False

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Correct Option: A
Explanation:

When water is heated from $0^oC$ its value decreases because its density increases and we can see this effect up to $4^oC$ because the density of ice is maximum at $4^oC$. Afterward the density decreases, the volume increases.

As, when we cool it from $4^oC$ its volume increases up to $0^oC$. At $0^oC$ latent heat of fusion converts it to a form of ice. So, the given statement is true.

The physical state of water is liquid at which of the following temperatures?

chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

  1. $25^o C$

  2. $0^oC$

  3. $100^oc$

  4. none of these

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Correct Option: A
Explanation:

At 0$ ^{\circ}C $, water exists as ice. 

At 100$ ^{\circ}C $, it exists as steam.
At 25$ ^{\circ}C $, water exists in liquid form.