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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–