Answer:
. 
Explanation 
In HX , X is more electronegative than Y so HX will ionise more because of  ionic bond between H and X . On the other hand H₂Y will be less polar as compared to HX so it will ionise to a lesser extent . Hence Ka will be more for HX . Ka represents the degree of ionisation of acid . Higher the ionisation , higher is the value of Ka . H₂Y which is less polar will ionise less and hence it will have lesser value of Ka . 
Hence H₂Y will have value of 10⁻⁷ and HX will have value of ka equal to 10⁹ . 
 
        
             
        
        
        
Molarity = mol/liter 
0.708M = 0.098mol/L
Rearrange to find L:
0.098mol/0.708M = .138L
For every liter there is 1000 mL: 
.138L • 1000mL =138mL KOH
        
             
        
        
        
Answer:
2AlCl3 + 3H2SO4 → Al2(SO4)3 + 6HCl
Explanation:
 
        
             
        
        
        
<span>the following element that is most reactive </span>would be  Fluorine