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

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

  1. $0^{\circ}C$
  2. $4^{\circ}C$
  3. $40^{\circ}C$
  4. $100^{\circ}C$
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Evaporation of water is:

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

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

Ice is lighter than water as

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

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

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

  1. True

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

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

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

  1. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.</p>

  2. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.</p>

  3. <p>Statement 1 is correct but Statement 2 is not correct.</p>

  4. <p>Statement 1 is not correct but Statement 2 is correct.</p>

  5. <p>Both the Statement 1 and Statement 2 are not correct. </p> <p>

    </p>
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

$I$. 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.

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

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 statements about water is false?

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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