Which chemical compounds of elements were used by Mendeleev to gauge their chemical similarities?
(A) Oxides (B) Chlorides (C) Hydrides (D) Sulphites
A, C
A, B, C
B, D
A, B, C, D
Mendeleev considered oxides and hydrides of elements for classifying their properties.
What type of chemical reaction is used to extract metals from their naturally occurring compounds like oxides or chlorides ?