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Tungsten: Quiz

  
  
  
  

Question 1: ________ (W2C and WC) are produced by heating powdered tungsten with carbon and are some of the hardest carbides, with a melting point of 2770 °C for WC and 2780 °C for W2C.
Tungsten carbideTitaniumPlatinumPlutonium

Question 2: Tungsten carbide behaves similarly to unalloyed tungsten and is resistant to chemical attack, although it reacts strongly with ________ to form tungsten hexachloride (WCl6).
OxygenChlorineHydrogenNitrogen

Question 3: The most common formal ________ of tungsten is +6, but it exhibits all oxidation states from −2 to +6.
OxideOxidation stateOxygenHydrogen

Question 4: [13] Tungsten has the lowest ________ of any pure metal.
SilverCopperCoefficient of thermal expansionAluminium

Question 5: Applications requiring its high density include heat sinks, weights, counterweights, ballast keels for yachts, tail ballast for commercial aircraft, and as ballast in race cars for NASCAR and ________.
2009 Formula One seasonFormula OneMichael Schumacher2010 Formula One season

Question 6: Elemental tungsten resists attack by oxygen, ________, and alkalis.
Acetic acidAcid–base reactionAcid dissociation constantAcid

Question 7: In ________, tungsten played a significant role in background political dealings.
Soviet occupationsSecond Sino-Japanese WarWorld War IICollaboration with the Axis Powers during World War II

Question 8: It is an ideal material to use as a dolly for ________, where the mass necessary for good results can be achieved in a compact bar.
RivetSteelReamerScrew

Question 9: Aqueous tungstate solutions are noted for the formation of heteropoly acids and polyoxometalate ________ under neutral and acidic conditions.
ElectrolyteLithium-ion batteryHalf cellIon

Question 10: Its density, similar to that of gold, allows tungsten to be used in jewelry as an alternative to ________ or platinum.
SilverCopperPalladiumGold
















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