which of the following exhibit variable valency a) ca,na b)mg,fe. c)fe,mn. d)zn,sn
Share
which of the following exhibit variable valency a) ca,na b)mg,fe. c)fe,mn. d)zn,sn
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Verified answer
Answer :
⇒ All transition elements except the first and last member of each series show variable valencies because difference of energy in the (n - 1)d and ns orbitals is very little and electrons from both the orbitals can be used for bond formation.
⇒ Elements of d - block are called as transition elements.
✭ Calcium (Ca) :
➝ Block : s
➝ Valency : (+2)
✭ Sodium (Na) :
➝ Block : s
➝ Valency : (+1)
✭ Magnesium (Mg) :
➝ Block : s
➝ Valency : (+2)
✭ Iron (Fe) :
➝ Block : d
➝ Velency : (+2)(+3)(+4)(+6)
✭ Manganese (Mn) :
➝ Block : d
➝ Valency : (+2)(+3)(+4)(+5)(+6)(+7)
✭ Zinc (Zn) :
➝ Block : d
➝ Valency : (+2)
✭ Tin (Sn) :
➝ Block : p
➝ Valency : (+4)
Correct answer : (C) Fe & Mn