Question

2. A shiny, malleable substance (X), which is an excellent conductor of electricity le substance (X), which is an excellent conductor of electricity, is burned in air to produce a white solid (Y). When this solid is placed in water, it slowly dissolves to form a colourless solution (2) a. What kind of substance is X? Support your answer. b. What kind of substance is Y? Support your answer. c. What kind of substance is Z? Support your answer. d. What effect would you expect Z to have on red litmus paper and phenolphthalein indicator?

Question c and d

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Answer 1

c) X is a good metal. So, Y is a metal oxide. Metal oxides are basic and produce metal hydroxides when dissolves in water. So, Z is a metal hydroxide and hence a base.

d) As compound Z is alkaline, so it turns red litmus into blue.

If Z is a strong hydroxide than phenolphthalein indicator will change its colour from yellow to pink to colourless. Even the hydroxide is not very strong than the colour will be light pink.

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