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Metal Questions Which is an essential feature of a ligand? A. a negative charge B. an odd number of electrons C. the presence of two or more atoms D. the presence of a non-bonding pair of electrons Which reaction results in the formation of a coloured substance? A. 2Li(s) + 2H2O(l) 2LiOH(aq) H2 (g) B. 2Na(s) Cl2 (g) 2NaCl(s) C. Cl2 (g) + 2NaI(aq) 2NaCl(aq) I2 (s) D. Ag(aq) Cl(aq) AgCl(s) Which statement best describes the attraction present in metallic bonding? A. the attraction between nuclei and electrons B. the attraction between positive ions and electrons C. the attraction between positive ions and negative ions D. the attraction between protons and electrons Which is the best description of metallic bonding? A. The attraction between oppositely charged ions B. The attraction between protons and electrons C. The attraction between positive ions and delocalised electrons D. The attraction between nuclei and electron pairs Which of the following salts form coloured solutions when dissolved in water? I. 3 ScCl II. 3 FeCl III. 2 NiCl IV. 2 ZnCl A. I and II only B. II and III only C. III and IV only D. I, II, III and IV 2006 10. Which electrons are lost by an atom of iron when it forms the Fe3ion? A. One s orbital electron and two d orbital electrons B. Two s orbital electrons and one d orbital electron C. Three s orbital electrons D. Three d orbital electrons (2000) Give the electronic configuration of the d-block element titanium. State three characteristics of d-block elements and account for each in terms of electrons. (7) (2002) Complex ions are a feature of the chemistry of d-block elements. For each of the following reactions give the formula of the complex ion formed and deduce its shape. [2] (i) Some iron metal is dissolved in sulfuric acid and left exposed to air until a yellow solution is formed. [2] (ii) A solution containing copper(II) ions is added to concentrated hydrochloric acid, forming a yellow solution. [2] (iii) A small amount of sodium hydroxide solution is added to silver nitrate solution. Ammonia solution is added until a colourless solution is obtained. (2) 2005 (d) Two characteristics of the d-block (transition) elements are that they exhibit variable oxidation states and form coloured compounds. (i) State two possible oxidation states for iron and explain these in terms of electron (2) arrangements. (ii) Explain why many compounds of d-block (transition) elements are coloured. (3) State the type of electron transitions that cause colour in complexes of transition metals. [1] ................................................................. ........ [1] (b) Which analytical technique would give bond length and bond angle data for a sample of a transition metal complex? ................................................................. ........