Question

V. Pick the odd one out. Give scientific reasons for your answer.
1. Nitrogen and oxygen, calcium oxide and water, nitrogen and hydrogen, copper sulphate and
iron
2. Lithium, sodium, fluorine, magnesium
3. Carbonic acid, magnesium hydroxide, sulphuric acid, sulphurous acid
4. Combination, decomposition, catalyst, displacement
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Answer 1

Answer:

3. Hydroxide because acid turns blue litmus red but oxides turn red litmus blue

2. Fluorine because it is non-metal but other three are metal

Answer 2

Answer:4-catalyst

Explanation:because the rest are types of reactions... But catalyst is not a reaction..