The answer you need is A.
The trend of ionization energy in the periodic table is decreasing from right to left and from top to bottom. In this case, we are given with elements <span>K, Ca, Ge, Se, Br, Kr and see the periodic table to check the trend. The answer from highest to lowest Kr, Br, Se, Ge, Ca, and K</span>
Answer: C. 
would increase and 
would decrease.
Explanation:
initially conc. c 0 0
At eqm. 
The expression for dissociation constant is,
for weak acid, 
is very very small , the expression will be,
As 
is directly proportional to concentration, the value of would increase on increasing the concentration.
Thus if would increase, 
would decrease.
