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Tantalum: Quiz


Question 1: These are stable, refractory, and reflective, and they have been proposed[23] as coatings for use in ________ wave mirrors.
X-rayInfraredUltravioletElectromagnetic spectrum

Question 2: The resulting ________ fluorotantalate salt is generally treated by reduction with molten sodium to produce a coarse tantalum powder.

Question 3: It can be dissolved with hydrofluoric acid or acidic solutions containing the ________ ion and sulfur trioxide, as well as with a solution of potassium hydroxide.
FluorineSodium fluorideFluoride poisoningFluoride

Question 4: Tantalum's high melting point of 3017 °C (boiling point 5458 °C) is exceeded only by tungsten and rhenium for metals, and ________.

Question 5: [27] Whereas the large-scale producers of niobium are in ________ and Canada, the ore there also yields a small percentage of tantalum.
BrazilMozambiqueEast TimorPortugal

Question 6: Newer processes use the liquid extraction of the fluorides from aqueous solution by ________ such as cyclohexanone.
SolventSolubilitySolvationPartition coefficient

Question 7: The name tantalum was derived from the name of the mythological Tantalus, the father of Niobe in ________.
HeraApolloGreek mythologyMuse

Question 8: It is able to form oxides with the ________ +5 (Ta2O5) and +4 (TaO2),[17] The most stable oxidation state is +5, tantalum pentoxide.
HydrogenOxidation stateOxygenValence (chemistry)

Question 9: [17] A tantalum-tellurium alloy forms ________.
Crystallographic restriction theoremAperiodic tilingQuasicrystalPenrose tiling

Question 10: In central Africa the colloquial term ________ is used to refer to niobium (COLumbium)-containing and TANtalum-containing minerals.


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