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6. Which of the following is a false statement about barium?

  • It gives a green colour to a flame
  • Its carbonate is more easily decomposed than calcium carbonate
  • A white precipitate forms when a solution of barium ions is added to dilute sulfuric acid.
  • Its oxide reacts with water to form a solution of pH greater than 7

7. Radium occurs below barium in group 2. On the basis of the trends in the chemistry of group 2, which of the following statements is true?

  • Radium sulfate is more soluble in water than magnesium sulfate.
  • Radium hydroxide is more soluble in water than calcium hydroxide
  • Radium carbonate is very soluble in water.
  • Radium carbonate is more easily decomposed by heating than magnesium carbonate.

8. What is the colour of methyl orange at the end point of a titration in which an alkali is added to an acid?

  • yellow
  • red
  • orange
  • pale pink

9. Which anions that contain chlorine are produced when chlorine gas is passed into cold, dilute sodium hydroxide solution?

  • ClO–, Cl–
  • ClO3–, ClO–
  • Cl–, ClO3–
  • ClO3–, ClO4–, Cl–