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Chapter 23: Q20 P (page 1059)

In which compound does Cr exhibit greater metallic behaviour, CrF2 or CrF6? Explain.

Short Answer

Expert verified

Cr exhibits greater metallic behaviour in CrF2

Step by step solution

01

Metallic behaviour of metal

The level of reactivity of a metal is defined by its metallic character. Metals have low ionization energies, which indicates that they lose electrons in chemical processes. Metal atoms have a low attraction for electrons within a compound, as seen by their low electronegativities.

02

Greater Metallic behaviour of compound

The transition metals with lower electronegativity have more metallic properties than ones with higher electronegativity (which have characteristics closer to nonmetals). It is known that fluorine has oxidation state of -l, so in CrF2 chromium has oxidation state of +2 and EN value around 1.7, so its behaviour is more metallic than the chromium in CrF6 (which has oxidation state of +6 and ENvalue around 2.3, thus it has more nonmetal behaviour).

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Most popular questions from this chapter

Give the number of d electrons (n of dn) for the central metal ion in

(a) [CrH2O6](ClO3)2; (b) [Mn(CN)6]2-; (c) [Ru(NO)(en)2Cl]Br.

Rank the following in order of decreasing(鈭�)and energy of light absorbed:[Cren3]3+,[CrCN6]3-,[CrCl6]3-

Question: Correct each name that has an error:

(a) Na[FeBr4]sodium tetrabromoferrate(II)

(b) [NiNH36]2-nickel hexaammine ion

(c) [CoNH33I3]triamminetriiodocobalt(III)

(d) [VCN6]3-hexacyanovanadium(III) ion

(e) K[FeCl4]potassium tetrachloroiron(III)

The green patina of Cu-alloy roofs results from corrosion in the presence ofO2,H2O,CO2, and sulfur compounds. The other members of Group 1B(11) Agand Au, do not form a patina. Corrosion of Cuand Agin the presence of sulfur compounds leads to a black tarnish, but Au does not tarnish. This pattern is different from that in Group 1A(1), where ease of oxidation increases down the group. Explain these different group patterns.

(a) What is a coordinate covalent bond?

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(c) Is it involved when HCl gas dissolves in water? Explain.
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