Question

formula of chloride of Eka silicon and Eco aluminium the element predicted by Mendeleev

Answer 1

 Eka-silicon is Germanium. The formula for chloride is ECl4 or (GeCl4).
 Eka aluminium is Gallium and formula for chloride is ECl3 ( GaCl3) hope this helps you. 

Answer 2

Heya mate
The answer of ur question is



Eka silicon is Germanium (GeCl4)

Eka Aluminium is Gallium (GaCl3)





hope it helps