The secondary valency of metal is equal to ______and is_______

On the basis of the following observations made with aqueous solutions, assign secondary valences to metals in the following compounds:

Aqueous solution of CoCl_(3)*6NH_(3) upon addition with AgNO_(3) produces 3 moles white precipitate . Primary and secondary valency of metal in this complex is

Valency of noble gases is zero.

The valence electron in alkali metal is a

The sum of number of valence electrons and valency of an element with atomic number 15 is_____.

The common impurities present in bauxite are ______and ______.

According to Werner' s coordination theory, there are two kinds of valence primary or ______ and secondary or _____The former type of valency is ______while the latter type is______ .

Major conduit of energy in land and aquatic ecosystem is transferred through ______and _______respectively.

25 gm of a metal is deposited on cathode during the electrolysis of metal nitrate solution by a current of 5 apm pssing for 4 hour if atomic weight of the metal is 100 The valency of metal in metal intrates is