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6. What is the amount, in mol, of NaOH dissolved in 25.0 cm(3^) of an aqueous solution of concentration 0.0125 mol dm (-3^)?

  • 3.125 x 10(-4^) mol
  • 3.125 x 10(-3^) mol
  • 3.125 mol

7. A ....... is a positively charged ion.

  • Cation
  • Anion
  • Proton

8. A redox reaction is a reaction in which.....

  • only oxidation takes place
  • both reduction and oxidation takes place.
  • only reduction takes place.

9. The .......... of a solution is the amount of solute in mol, dissolved per 1 dm(3^) of solution.

  • Concentration
  • Mass
  • Volume

10. An ......... is a negatively charged ion.

  • Electron
  • Anion
  • Cation

11. Which of the following equations is correct? (n=moles, V=volume)

  • n=V/24.0
  • n=24.0/V
  • 24.0=n/V

12. The ........... formula is the simplest whole-number ratio of atoms of each element present in a compound.

  • Empirical
  • Molecular
  • Simple

13. What refers to water molecules that form an essential part of the crystalline structure of a compound?

  • Acid of crystallisation
  • Water of crystallisation
  • Liquid of crystallisation

14. Hydrated refers to a crystalline compound containing ........ molecules.

  • Metal
  • Water
  • Gas

15. An ........ is a type of base that dissolves in water forming hydroxide ions, OH(-^) (aq) ions.

  • Alkali
  • Acid
  • Base

16. What is the oxidation number combined oxygen?

  • 0
  • -2
  • +2

17. An ................... is a reagent that oxidises (takes electrons from) another species.

  • oxidiser
  • oxidising agent
  • reducing agent

18. Which of these equations is correct? (n=moles, m=mass, M=molar mass)

  • n=m/M
  • n=M/m
  • M=n/m

19. A base is a species that is a proton ....... .

  • Neutraliser
  • Acceptor
  • Donor

20. Which of the following acids is nitric acid?

  • HCl
  • HNO3
  • H2SO4