Tag: structure and properties of water

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

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

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Why water is called an universal solvent?

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which one of the following is not a physical property 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 $100^\circ C$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

What is the molecular weight of water?

  1. 21

  2. 18

  3. 20

  4. 16
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Surface tension

  2. Specific heat

  3. Heat of vaporization and heat of fusion

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

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

Is the above statement correct?

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.