Tag: conservation of water and recycling

Questions Related to conservation of water and recycling

________is known as the universal solvent.

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

  1. Alcohol

  2. Benzene

  3. Ether

  4. Water

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Correct Option: D
Explanation:

Water is known as the universal solvent because it is capable of dissolving a variety different substances, which is why it is such a good solvent.

The density of water is not same at all temperatures because of its anomalous expansion. The density is maximum at:

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

  1. $0^{\circ}C$

  2. $4^{\circ}C$

  3. $40^{\circ}C$

  4. $100^{\circ}C$

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Correct Option: B
Explanation:

Density of water is maximum at $4^{\circ}C$. 

On cooling from  $4^{\circ}C$ to $0^{\circ}C$ it expands and on heating from $0^{\circ}C$ to $4^{\circ}C$ it contracts. 
On heating above $4^{\circ}C$ it expands.

The freezing point of water is:

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

  1. $4^\circ C$

  2. $3 ^\circ C$

  3. $1 ^\circ C$

  4. $0^\circ C$

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Correct Option: D
Explanation:

The temperature at which a liquid turns into a solid when cooled is called freezing point.
The freezing point of water is $0^\circ C$.

Water exists in ........... state(s).

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

  1. one

  2. two

  3. three

  4. four

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Correct Option: C
Explanation:

Water exists in three states namely solid, liquid and gas in the form of ice, water and vapour.

Evaporation of water is:

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

  1. a process is which neither heat is evolved nor absorbed

  2. a process accompanied by chemical reaction

  3. an exothermic change

  4. an endothermic change

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Correct Option: D
Explanation:

Evaporation is an endothermic process because water molecules must absorb heat from the surroundings to increase their kinetic energy. For example, sweat which cools the human body as it evaporates from the skin.

Hence (D) option is correct.

Ice is lighter than water as

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

  1. Lattice aggregates occupy more space.

  2. Cold water is extremely dense.

  3. Hydrogen bonds are absent in ice.

  4. Lattice aggregates are absent in ice.

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Correct Option: A
Explanation:
When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding. Solid water, or ice, is less dense than liquid water. Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density.

Ice has density less that $1\ g \ cm^{-3}$.

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:

The density of ice is less than the density of water i.e., $1$ $g/cm^3$ due to its cage like structure of hydrogen bonds. The orientation of hydrogen bonds cause the molecules to push further apart which lowers its density. 

Statement 1: Ice is less dense than liquid water.
Statement 2: Water molecules are nonpolar.

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

  1. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

  2. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

  3. Statement 1 is correct but Statement 2 is not correct.

  4. Statement 1 is not correct but Statement 2 is correct.

  5. Both the Statement 1 and Statement 2 are not correct.


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Correct Option: C
Explanation:

Statement 1: Ice is less dense than liquid water.
Hence, an ice cube floats in a glass of water.
Statement 2: Water molecules are polar due to electronegativity difference between O and H atoms and non linear structure of water molecule.
Hence, statement 1 is correct but statement 2 is not correct.

$I$. Melting is an exothermic process.
$II$. Heat energy will cause covalent bonds in water to break as water converts from the solid state to the liquid state.

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

  1. Statement $I$ is true, Statement $II$ is true

  2. Statement $I$ is true, Statement $II$ is false

  3. Statement $I$ is false, Statement $II$ is true

  4. Statement $I$ is false, Statement $II$ is false

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Correct Option: D
Explanation:

Melting is endothermic. Melting process needs energy to convert it from solid to liquid state.

Ice melts when heat energy causes the molecules to move faster, breaking of hydrogen bonds between molecules to form liquid water. In the melting process, the water molecules actually absorb energy.

Which one of the following statements about water is false?

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

  1. Ice formed by heavy water sinks in normal water

  2. Water is oxidized to oxygen during photosynthesis

  3. Water can act both as an acid and as a base

  4. There is extensive intramolecular hydrogen bonding in the condensed phase

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Correct Option: D
Explanation:

Water possesses intermolecular hydrogen bonding in the condensed phase rather than intramolecular hydrogen bonding. Therefore statement (D) is incorrect