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exam_F_review - 1 If H2O(l converts spontaneously to H2O(g...

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1. If H 2 O(l) converts spontaneously to H 2 O(g) at 99°C, it is true that: (1) ΔG r ° can be “+” or “–“. (2) ΔG r ° is “–“ and ΔG r is “–“. (3 ) ΔS r ° is “+“ and ΔS r is “+“. (4) P H 2 O(g) > VP H 2 O(l). (5) |ΔH r °| = |TΔS r °|. 2. Of the following listed systems at standard state conditions, spontaneous electron flow is least likely to occur for: (1 ) Al(s) in 1 M NaOH. (2) Al(s) in 1 M HNO 3 . (3) Al(s) in oxygenated 1 M KOH. (4) Al(s) in oxygenated 1 M HF. (5) Al(s) in chlorinated water.
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3. The strongest π-acceptor ligand among the following should be: (1 ) PF 3 , (2) PH 2 , (3) CCl 3 , (4) AsH 3 , (5) S 2– . 4. If in a buffered, saturated aqueous soln. of CaCO 3 it is found that [Ca 2+ ] [“H 2 CO 3 ”] and [Ca 2+ ] = 5/2[HCO 3 ], the soln. has been buffered at a pH closest to: (1) 11.2, (2 ) 10.5, (3) 9.3, (4) 8.6, (5) 9.8. 5. Given that NH 3 is a strong field ligand, the following listed octahedral complex which exhibits the greatest degree of stability based on CFSE (Crystal Field Stabilization Energy) and pairing energy consideration is: (1) [Ni(NH 3 ) 6 ] 2+ , (2) [Co(NH 3 ) 6 ] 2+ , (3) [Co(NH 3 ) 6 ] 3+ , (4) [Pd(NH 3 ) 6 ] 2+ , (5 ) [Rh(NH 3 ) 6 ] 3+ .
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6. The strongest σ-donor ligand among the following should be: (1) F , (2) HO , (3) HS
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