Which of the following properties describes the diagonal relationship between boron and silicon?
a. BCl3 is not hydrolysed while SiCl4 can be hydrolysed
b. Both form oxides B2O3 is amphoteric and SiO2 is acidic
c. Both metals dissolve in cold and dilute nitric acid
d. Silicide and boride salts are hydrolysed by water