Answer:
The strong acid reacts with the weak base in the buffer to form a weak acid, which produces few H+ ions in solution and therefore only a little change in pH.
Explanation:
When a strong acid is added to the buffer, the acid dissociates and furnish hydrogen ions which combine with the conjugate of the weak acid, forming weak acid. The weak acid dissociates to only some extent and can furnish only some protons and there is no significant change in the pH.
Hence, option B is correct.
According to Henry's law:
C = K P when,
C is the solubility of a gas at a constant temperature in a particular solvent.
K is the Henry law constant
p is the pressure of the gas
we have the pressure and the solubility so we will get the K at first:
by substitution:
0.153 = K * 0.37atm
K= 0.4
∴ C when P = 2.4 atm
∴ C = 0.37 * 2.4 atm = 0.888 = 88.8 g/100g H2O
is having lowest oxidation number of sulphur in teh options given. The oxidation number is -2.
The correct option is E.
Explanation:
have oxidation number of -2, which is lowest in all the options given.
In the given examples 
will have oxidation number zero because it is in elemental form. In the rules for oxidation number it is given that any element in free state has its oxidation number zero.
All other options are in compound form as:
S
= oxidation number is +4. It is calculated as oxygen having O.N of -2,
The charge on the atom is -2, so sum of the oxidation numbers of all the elements should be equal to -2.
x+3(-2)= -2
x = 4
S
= The charge on the atom is -2, so sum of the oxidation numbers of all the elements should be equal to -2.
x +4(-2) = -2
x = +6
The charge on the atom is -2, so sum of the oxidation numbers of all the elements should be equal to -2.
2x + 3(-2) = -2
2x = 4
x = 2
= oxidation number is -2 as the charge on ion in equal to its oxidation number.
The answer is (4) Sc. The metallic properties has the rule that from left to right, the metallic property is from high to low. Then from the position of these four elements, we can get the answer.
