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 is used while washing clothes?

  1. Odour

  2. Colour

  3. Solubility

  4. Sand
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water is a good solvent. It combine with dirt and other particles with it when treated with soap, which is water soluble and form lather in water. Hence due to its solubility it is used while washing clothes. 

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

Statement 1: Water boils below ${100}^{o}C$ at high altitudes. 
Statement 2: Atmospheric pressure varies inversely with altitude.

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

  2. Both the 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.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pressure changes inversely with altitudes and boiling point directly proportional to pressure. Pressure and boiling points are low at high altitudes. So water boils below 100$ ^{\circ}C $.

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

Water has maximum density at

  1. Room temperature
  2. ${4}^{o}C$
  3. ${0}^{o}C$
  4. $-{4}^{o}C$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
When Water is in its Solid Form (Ice) below $0^0 C$, it is forced into a regular Cage like Structure with small voids due to which the Volume of Ice is larger.
At $4^0 C$, the Cage like Structure of Ice starts to break and the molecules can slide along each other, closing the empy voids due to which momentarily the Volume of Water decreases. Due to decrease in Volume, Density increases because Density is inversely proportional to Volume.
As temperature rises to over $4^0 C$, the extra space needed by increased motion of water molecules starts being larger than the space gained due to structural changes and the molecules start to move away from each other due to which the Volume again increases and Density decreases.

Thus, Density maximum is reached at $4^0C$.
Multiple choice chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

Molecular mass of water ______.

  1. $18 u$
  2. $16 u$
  3. $15 u$
  4. $10 u$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As we know the molecular formula of water is H2O which means that one molecule of water contain 2 atoms of hydrogen and 1 atom of oxygen.

Then weight of 1 atom of hydrogen= 1 u

so weight of 2 atom= 2 u

Weight of 1 atom of oxygen= 16 u

Then molecular weight of water= 2* weight of 1 atom of hydrogen+ weight of 1 atom of oxygen

Thus molecular weight of water is approximately 2+16 u = 18 u

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

During hydrate formation from aqueous solution water can be associated in different forms. Indicate the wrong combination. 
Coordinated water -$[Cr(H _{2}O) _{6}]^{3+}3Cl^{-}$
Interstitial water - $BaCl _{2}.2H _{2}O$
Hydrogen bonded water --$[Cu(H _{2}O) _{4}]^{2+}SO _{4}^{2-}.H _{2}O$

  1. (i)

  2. (ii)

  3. (iii)

  4. none of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Coordinated water is water that is a ligand in a metal complex. The metal atom and the water molecules are held together by coordinate bonds.
Interstitial water is water that is present in the interstitial sites of a crystal lattice.
Hydrogen-bonded water is the water that that is linked to some other ion by hydrogen bonding.
Multiple choice chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

A teacher one day pointed out to his students the peculiar fact that water is a unique liquid that freezes exactly at $0^oC$ and boils exactly at $100^oC$. He asked the students to find the correct statement based on this fact.


Which of the statements is true regarding the above fact?

  1. Water dissolves anything however sparingly the dissolution may be.

  2. Water is a polar molecule.

  3. Boiling and freezing temperatures of water were used to define a temperature scale.

  4. Liquid water is denser than ice.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Option (C) is correct.
Boiling and freezing temperatures of water were used to define a temperature scale.The scaling of zero degree centigrade is based on this fact.