Chemistry
Grade-10
Easy
Question
Identify the incorrect statements from the following.
I. Aluminium Hydroxide is a strong base.
II. Magnesium reacts with cold water to give magnesium oxides with the liberation of hydrogen gas.
III. Boric acid is an excellent cleaner for all worms and insects in the food grains.
IV. Sodium sulphate is the salt formed by sodium hydroxide and sulphuric acid.
- Only (I) and (II)
- Only (II) and (III)
- Only (II)
- Only (IV)
Hint:
Magnesium does not react with cold water.
The correct answer is: Only (II)
Magnesium reacts with cold water to give magnesium oxides with the liberation of hydrogen gas. - INCORRECT
Magnesium doesn't really react with cold water is that it becomes coated with Magnesium hydroxide which is insoluble, so it prevents water coming into contact with Magnesium. It reacts with hot water, so when Mg reacts with hot water, it will form magnesium hydroxide and hydrogen gas.
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