751. The correct electronic configuration of Cr is____________________?
A. [Ar]4s23d4
B. [Ar] 4s23d4
C. [Ar]4s03d5
D. [Ar]4s13d5

752. The oxidation state of transition elements is usually _______________________?
A. variable
B. constant
C. single
D. infinite

753. Non-stoichiometric compounds of transition elements are called___________________?
A. hydrates
B. hydrides
C. binary compounds
D. interstitial compounds

754. The specie which donates electrons to central metal atom in coordination sphere is called____________________?
A. anion
B. cation
C. Ligand is positively charged
D. acid

755. Which of the following can form a chealate______________________?
A. ammine
B. oxalato
C. carbonyl
D. cyano

756. The compound or complex ion which has a ring in its structure__________________?
A. polydentate ligand
B. chelate
C. monodentate ligand
D. hydrate

757. Geometry of the complex compounds usually depends upon __________________?
A. type of ligands
B. types of hybridization in the elements of ligands
C. hybridization of central metal
D. All of above

758. In pig iron the concentration of C-atom is ___________________?
A. 0.12 — 0.25%
B. 2.5 — 4.5%
C. 2.0 — 4.0%
D. 0.25 — 2.5%

759. With impurities like P and S the open hearth furnace is lined with ?
A. SiO2
B. Fe2O3
C. FeO
D. CaO MgO

760. Which is sold as fertilizer ___________________?
A. CaSiO3
B. Na2SiO3
C. Ca3(PO4)2
D. MnSiO3