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Radiochemistry and Nuclear Chemistry self-test # 5

Comprises Chapter 5

This is a self grading test of your knowledge. It consists of 20 randomly chosen questions with single or multiple answers. The questions with single answers have round buttons and the questions with perhaps more than one correct answer have square buttons. Answer the questions by clicking on the corresponding button in the list of alternative answers. On questions with a single answer (round buttons to click on), it is only possible to mark one of the alternative answers as correct.
Grading of the completed test is automatic when you click on the button marked "GRADE MY ANSWERS" at the end of the test.
Correct answers can be read by clicking on the button having the same number as the question. You find these buttons at the end of the test. You can also refresh your memory first by jumping directly to the answer buttons and click on them to get answers and read relevant parts of the book before doing this test.
On the questions with one or more possible answers (squares to click on) only the first click on each button is recorded as an answer. Hence you must click on the reset button below the question before you can change the original answer(s). Failure to do this will probably make the answers on this question regarded as wrong in the grading process.
Please observe that your teacher may require a deeper understanding of the treated subject than reflected by this test. In case you have any valuable comments or questions regarding this self-test, explain them in an e-mail to: jol@nc.chalmers.se 



Question # 1 (One answer) 226Ra occurs in one of the long natural decay series. Which one?

    A) The thorium series
    B) The actinide series
    C) The uranium series
    D) The actinium series
    E) The lanthanide series

Question # 2 (One or more answers) Uranium and uranium compounds are to a large extent used today as

    A) self-luminous material in watches
    B) photo catalysts in conversion of sunlight to hydrogen
    C) heavy material in armour piercing projectiles
    D) fuel in nuclear power stations
    E) electrolyte in fuel cells

In case of an error in the answers above, please click on this button before making any corrections 

Question # 3 (One or more answers) Thorium and thorium compounds are used today as

    A) rat poison
    B) electrodes in gas discharge lamps
    C) material in ovens for very high temperatures
    D) getter in cathode ray tubes for TV-sets
    E) Welsbach nets for high luminosity gas- or kerosene-fuelled lamps

In case of an error in the answers above, please click on this button before making any corrections 

Question # 4 (One answer) The actinium series begins with a naturally occurring long lived radionuclide. Which of the following is that?

    A) 232Th
    B) 233U
    C) 234U
    D) 235U
    E) 238U

Question # 5 (One answer) The average content of Th in the Earth's solid crust is about

    A) 10 ppb
    B) 100 ppb
    C) 1 ppm
    D) 10 ppm
    E) 100 ppm

Question # 6 (One answer) The age of very old organic remains, e.g. pieces of cloth, found during archeological excavations can today be determined quite accurately using

    A) autoradiography
    B) the H-3 method
    C) cryptography
    D) the C-14 method
    E) dendrochronology

Question # 7 (One or more answers) Two processes are used in winning of uranium from sulfuric acid leach solutions. What are they called?

    A) AMEX
    B) AMOCO
    C) DAPEX
    D) DRAGON
    E) DUPLEX

In case of an error in the answers above, please click on this button before making any corrections 

Question # 8 (One answer) The thorium series has a second name. It is also called

    A) the 4n series
    B) the 4n+1 series
    C) the 4n+2 series
    D) the 4n+3 series
    E) the 4n+4 series

Question # 9 (One or more answers) Which stable lead isotope(s) is/are not the end product from any of the long natural decay series?

    A) 204Pb
    B) 205Pb
    C) 206Pb
    D) 207Pb
    E) 208Pb

In case of an error in the answers above, please click on this button before making any corrections 

Question # 10 (One answer) Uranium was used as a constituent of armour piercing ammunition in the Gulf war. What kind of uranium was that?

    A) Uranium recovered from spent nuclear fuel
    B) Natural uranium
    C) Enriched uranium
    D) Depleted uranium
    E) Irradiated uranium

Question # 11 (One answer) Solvent extraction with a reagent diluted by an aliphatic hydrocarbon is used in industrial conversion of yellow cake to high purity uranium compounds. The reagent is an organic compound containing phosphorus with a name which is usually abbreviated to

    A) TTA
    B) TBP
    C) HDEHP
    D) TRPO
    E) POPOP

Question # 12 (One or more answers) The sources of radionuclides found in nature can be

    A) Cosmogenic
    B) Primordial
    C) Secondary
    D) Anthropogenic
    E) Quartenary

In case of an error in the answers above, please click on this button before making any corrections 

Question # 13 (One answer) Which of the radionuclides with a cosmogenic origin is produced most on Earth in terms of Bq/m2?

    A) 3H
    B) 10Be
    C) 14C
    D) 22Na
    E) 26Al

Question # 14 (One answer) 205Pb has a half-life of 1.9x107 years. In which decay series is it produced?

    A) The thorium series
    B) The neptunium series
    C) The uranium series
    D) Th actinium series
    E) None

Question # 15 (One answer) The uranyl ion is shaped like a

    A) sphere
    B) rod
    C) pyramid
    D) cube
    E) donut

Question # 16 (One answer) "Yellow cake" is the trade name for impure

    A) chromium yellow
    B) U3O8 
    C) PbO2 
    D) UO2(SO4)2 
    E) opium

Question # 17 (One or more answers) The natural occurrence of radioactive isotopes to a number of different element is due to

    A) releases from radiotherapy in hospitals
    B) nuclear reactions caused by cosmic radiation
    C) combustion of fossile fuels like coal
    D) their very long half-lives which makes them survivers from the synthesis of our elements
    E) their membership in radioactive decay series starting with very long-lived radionuclides

In case of an error in the answers above, please click on this button before making any corrections 

Question # 18 (One answer) Which nuclide in our atmosphere is the target material for cosmogenic production of the long-lived carbon isotope?

    A) 12C
    B) 14N
    C) 15N
    D) 16O
    E) 18O

Question # 19 (One or more answers) Uranium can exist in acidic aqueous solutions during a considerable time and in a reasonable concentration as one or more of the following ions. Which?

    A) U2+ 
    B) U3+ 
    C) U4+ 
    D) UO2+ 
    E) UO22+ 

In case of an error in the answers above, please click on this button before making any corrections 

Question # 20 (One answer) The only Th ion stable in acidic aqueous solutions is

    A) Th+ 
    B) Th2+ 
    C) Th3+ 
    D) Th4+ 
    E) ThO2+ 


Correct answers to each question can be obtained by clicking on the corresponding button below

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(Updated 2001-08-19)