Which of the following is needed to form a coordination compound ? a. complex ion b. Arrhenius base c. central metal ion d. bidentate ligand ------- Al(OH)3. is known to be amphoteric. What will be formed when it is reacted with aqueous NaOH ? a. [Al(OH)4]+ soluble b. soluble. Al+3 will be formed c. no reaction. Al(OH)3 will only react with acid. d. [Al(OH)4]+ insoluble Following pKa and pkb of following acid and bases, choose which one you will use as buffer at pH 9 Phenol pKa = 10.00 Pyridine pKb = 8.82 Aniline pKb = 9.13 a. all can be used as buffers b. pyridine c. aniline d. phenol ----------------- Which of the following is true about chemical equilibrium ? a. The chemical equilibrium constant can be calculated from Gibbs Free Energy at 298 K only. b. If rate of forward reaction equals the rate of backward reaction, the system is said to be in equilibrium. c. Once system has reached equilibrium, the equilibrium can not be disturbed. d. The higher the magnitude of the equilibrium constant, the less energy the reaction needs. ---------------- At higher temperature, rate constant of a given reaction a. Will increase as the energy of molecules will increase, resulting in more collisions. b. Will increase as the energy of molecules will increase resulting in higher activation energy. c. Will increase if the reaction is endothermic as endothermic reaction absorbs heat. d. Will increase if the reaction is exothermic as exothermic reaction releases heat.
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Which of the following is needed to form a coordination compound ?
a. complex ion
b. Arrhenius base
c. central metal ion
d. bidentate ligand
-------
Al(OH)3. is known to be amphoteric. What will be formed when it is reacted with aqueous NaOH ?
a. [Al(OH)4]+ soluble
b. soluble. Al+3 will be formed
c. no reaction. Al(OH)3 will only react with acid.
d. [Al(OH)4]+ insoluble
Following pKa and pkb of following acid and bases, choose which one you will use as buffer at pH 9
Phenol pKa = 10.00
Pyridine pKb = 8.82
Aniline pKb = 9.13
a. all can be used as buffers
b. pyridine
c. aniline
d. phenol
-----------------
Which of the following is true about
a. The chemical equilibrium constant can be calculated from Gibbs Free Energy at 298 K only.
b. If
c. Once system has reached equilibrium, the equilibrium can not be disturbed.
d. The higher the magnitude of the equilibrium constant, the less energy the reaction needs.
----------------
At higher temperature, rate constant of a given reaction
a. Will increase as the energy of molecules will increase, resulting in more collisions.
b. Will increase as the energy of molecules will increase resulting in higher activation energy.
c. Will increase if the reaction is endothermic as endothermic reaction absorbs heat.
d. Will increase if the reaction is exothermic as exothermic reaction releases heat.
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