15- Given the following reaction 4 2n No hich of the following statements is TRU

Question

15- Given the following reaction 4 2n No hich of the following statements is TRUE? a) The N in Noo- gains electrons b) The H in OHT is r c) The oxygen in NO is oxidized d) The oxidizing agent is e) zine is the oxidizing agent 16. Using the table of standard electrode potentials decide which of the following statements is completely true a) H can reduce Mn reduce Zn c) Ni an reduce Bra Fea" can oxidize Ha e) Cu xidize 17. A voltaic cel1 is constructed by immersing a strip of lanthanum netal in 1.0 La (NO) olution in one beaker and a strip of nickel in 1.00 M solution in another beaker A wire and a salt bridge complete the circuit The lanthanum strip loses mass tration of lanthanum ions in the solution increases and the nickel electrode gains mass, and the concentration of nickel ions decreases The electrode at which oxidation occurs is the II, cathode III. positive electrode electrode at which electrons are produced egative electrode VI lanthanum electrode a) I, III, IV and VI b) I, IV, V, and VI c) II, IV, V, and VI d) II, IV and V e) D III, and IV 18. The form of radiation with the most penetrating ability is a) alpha particle b) yogurt raisins c) gamma ray d) positron e) beta particle 9. Which nuclide is used to study lung conditions? 131I c) "Fee e) Fe d) 133Xe a) 235U

Explanation / Answer

Q15.

Given

4Zn + NO3- + 7OH- = NH3 + 4ZNO2-2 + 2H2O

which is true:

a)

N in NO3- gains 8 electrons = This is true and possible

N goes from

NO3- = +5

to NH3 = -3

therefore = (5--3) = 8 electrons

b)

H goes from +1 to +1, there is no effect, this is not true

c)

O in NO3- goes from -2 to -2, therefore, no overall change, this is not true

d)

oxidizing/reducing agents can NEVER be in the product, side, therefore this is false

e)

oxidizing agent = must be reducing, Zn goes from 0 to +2 therefore, it is being oxidized, this is NOT the oxidizing agent, this is FALSE

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