Aluminum is an active metal, but does not corrode as iron docs because a. Al doe

Question

Aluminum is an active metal, but does not corrode as iron docs because a. Al does not react with O_2. b. a protective layer of Al_2O_3 forms on the metal surface. c. Al is harder to oxidize than is Fe. d. the enthalpy of formation of aluminum oxide is negative. e. aluminum has a high tensile strength. Based on the following options, select the substance with hydrogen in the +1 oxidation state. a. KH b. CH_4 c. H_2 d. A1H_3 c. SrH_2 Which of the following choices can function as a bidentate ligand? a. PH_3 b. Cl^- c. CN^- d. -0CH_2CH_2CH_2O^- e. CO Calculate Delta G degree for the reaction 3N0_2(g) + H_20(l) rightarrow 2HN0_3(l) + N0(g). a. 8.7 kJ/mol b. 192 kJ/mol c. -414 kJ/mol d. -192 kJ/mol e. -155kJ/mol Calculate the pOH for a solution with [H_3O^+] = 3.1 times 10^-9 M a. 3.10 b. 10.90 c. 8.51 d. 5.49 c. 3.2 times 10^-6

Explanation / Answer

5. Answer: option b

Al forms passive oxide layer on exposure to air which prevent further reaction and hence Al is not corroded. Reaction for formation of passive oxide film on Al surface is:

2Al+3O2=Al2O3

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