Question

Identify the element out of the choices for which hints are given: 

(a) Hint (This metal is extracted from sea water), choices (Mg, Be, Ca, Sr) 

(b) Hint (Material used in solar cells contain the metal); choices (Cs, Si, K, Rb). 

(c) Hint (most electropositive element amongst alkaline earth metals); choices (Be, Ba, Ca, Mg).

Answer 1

(a) Mg because Mg and …. a are present in large amount in sea water. 

(b) Si is used in solar cells. 

(c) Ba is most electropositive because electrospositive character increases down the group.