The answer is surface tension
Answer:
The correct answer is - D. Freezing point depression.
Explanation:
When rock salt is spread over snow-covered icy roads, it generates a liquid layer over it by melting from the surface thereby lowering or depression in the freezing point below the ice.
Therefore, due to this liquid layer comes into the contact with the ice present on the road and causes other ice to melts. This keeps on decreasing the volume of the ice on the road therefore, rock salts spread on the roads during a snowstorm.
Answer: Option (C) is the correct answer.
Explanation:
A water molecule is made up of two hydrogen atoms and one oxygen atom. Its molecular formula is 
.
It is known that hydrogen is electropositive in nature whereas oxygen is electronegative in nature. Therefore, oxygen will pull the electron of hydrogen towards itself as a result, there will be formation of partial positive charge on hydrogen and partial negative charge on oxygen atom.
Thus, the water molecule becomes polar. So, we can conclude that water molecule is a polar molecule because water molecules have a positive charge on one end and a negative charge on the other.
<span>When the </span>valence electron<span> in any atom gains sufficient energy from some outside force. it can break away from the parent atom and become what is called a free </span>electron<span>.</span>
PKa is defined as the logarithm of the inverse of Ka, i.e
pKa = log ( 1 / Ka)
Ka is the dissociation constant of the acid. The larger Ka the stronger the acid.
On the other hand, from pKa = log (1 / Ka) the larger Ka the smaller 1 /Ka, and so the smaller log (1/Ka).
So, the relation between Ka and pKa is inverse, which means that an acid with greater value of pKa will have lower value Ka, and so it will be weaker or the smaller the pKa the stronger the acid.
Therefore, in our case HA has the lower pKa ant it will be the stronger acid.
Answer: HA is the stronger acid, because it has the lower pKa and pKa is inversely related to the strength of the acid.
