The table below shows melting points and boiling points of different substances X, Y and Z.

1. aState the state of matter of each substance at room temperature (25 °C). [3]
2. bSubstance Y was found mixed with water. Name the method of separation which can be used to separate the two. [1]
3. cSubstance Z is dissolved in water. Explain how this would affect the boiling point of the water. [2]
4. dDefine melting point. [1]

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