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 The melting temperature is 1,000 K with a fusion of 10,000 J/mole

The followings are the bulk property of two metals: metal A and metal B:
Metal A:  The melting temperature is 1,000 K with a fusion of 10,000 J/mole.
   The cP for solid phase is (21 + 5*10-3 * T)  J/moleK.
   The cP for liquid phase is 31 J/moleK.
Metal B:  The melting temperature is 1,200 K with a fusion of 12,000 J/mole.
   The cP for solid phase is 20 + 6*10-3 * T  J/moleK.
   The cP for liquid phase is 40 J/moleK.
Assuming metal A and metal B form ideal liquid solution and regular solid solution (GXS =
3000R XAXB, where R, XA, and XB are gas constant, mole fraction of metal A and mole
fraction of metal B, respectively), respectively, please draw the phase diagram for this binary
system.
In the calculation, you may assume that the cp for both liquid and solid phase can be
employed at any temperature

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Aluminium chloride exists in the form of dimer at room temperature.

2(a) Aluminium chloride exists in the form of dimer at room temperature. (i) Draw the Lewis structure of aluminium chloride when it is heated to 1000 °C. (2 marks) 

(ii) Mr Andrew plans to replace the aluminium oxide used in Hall-Héroult process with aluminium chloride. As Mr Andrew’s colleague, state whether you agree with him. Explain your answer. (3 marks) 

(iii) State your observation when the aqueous solution of aluminium chloride is tested with a blue litmus paper. Explain your answer with the aid of a balanced chemical equation. (4 marks) 

(b) Write the balanced chemical equation(s) involved, if any, when aluminium is used to extract chromium and calcium from chromium(IV) oxide, CrO2 and calcium oxide, CaO, respectively. Provide an explanation if the extraction process is unsuccessful. (3 marks)

(c) Raymond attempts to coat an aluminium key with a protective layer of aluminium oxide via anodisation process. He completes the circuit by connecting the key to the negative terminal and a platinum strip to the positive terminal. Predict whether Raymond’s attempt is successful. Briefly explain your answer. (3 marks)

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