chemistry 12. Which if any of the following properties applies to week acids? Th

Question

chemistry 12. Which if any of the following properties applies to week acids? They are excellent conductors of electricity. When dissolved in water, they do not ionize completely All of the above None of the above 13. Ammonia , NH3, produces hydroxide ions in aqueous solution by: donating a proton to an acid molecule. donating a proton to a water molecule. donating a hydrogen ion to a water molecule. accepting an electron from an acid molecule. accepting a proton from a water molecule. 14. In a redox reaction, electrons are transferred from the substance being oxidized to the reducing agent. from the oxidizing agent to the reducing agent. from the substance being reduced lo the oxidizing agent. from the substance being oxidized to that being reduced. from the substance being reduced to the substance being oxidized. 15. the oxidation numbers of P, S and CI in H3PO4, H2S, and HCIO4 are respectively 16. Identify the spices oxidized in the following redox reaction

Explanation / Answer

12. c

13. e

NH3 + H-OH [water] -----> NH4+ + OH-

14. d [since oxidation is removal while reduction is addition of electrons]

15. Overall charge on a neutral moelcule is always zero. So,

H3PO4 : 3(+1) + 1(x) + 4(-2) = 0

x = +5

H2S: 2(+1) + 1(x) = 0

x = -2

HClO4 : 1(+1) + 1(x) + 4(-2) = 0

x = +7

So answer : option e

16. Cu is losing 2 electrons [undergoing oxidation - loss of electrons] to form Cu2+

answer: option b

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