The first row of transition elements are able to show variable oxidation states in aqueous solution and in the compounds because

(a)  

Scandium is not considered as transition element because

(a)  

The colour of nickel(II) aqueous ion is

(a)  

The transition metals are able to form complex compounds because

(a)  

The maximum oxidation state of chromium in its aqueous solution and compound is

(a)  

The melting points of transition elements are above 1000 $\degree$ C because

(a)  

The IUPAC name of the given complex ion; [Cr(NH₃)₃Cl₃]

(a)  

Iron filling is an effective catalyst used in the Haber process because

(a)  

The oxidation state of chromiun in K₂Cr₂O₇.

(a)  

Titanium is a better electrical conductor than calcium because

(a)  

EDTA^4- is a stronger ligand than NH₃ molecule because

(a)  

Transition element is defined as

(a)  

Zn²⁺ ion is colourless because

(a)  

iron(III) ion is used in the reaction between aqueous solution of iodide ion and peroxodisulphate ion. Iron(III) ion playing an effective role in the reaction because

(a)  

The proton number of iron is 26. The valence electronic configuration of iron in the complex ion [FeCl₂(CN)₄]^3- is

(a)  

Ni³⁺ cation has (a)   unpaired electrons

There are (a)   oxidation states exhibited by Manganese.