Answer the following question.

Question 15 Marks

How will you show that non- metal oxides are acidic in nature?

Answer

1. Take non-metal oxide in a test tube. Add water in the test tube. Test the solution with blue and red litmus paper. Red litmus paper remains as it is while blue litmus paper turns red. This shows that non¬metal oxides are acidic in nature.
2. The oxides of non-metals are acidic in nature. They react with bases to form soluble salt and water. Therefore, non-metal oxides are acidic in nature.
$C+O_2 \rightarrow CO_2$
$CO_2+2 NaOH \rightarrow Na_2 CO_3+H_2 O$

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Question 25 Marks

How will you show that metal oxides are basic in nature?

Answer

1. Take magnesium oxide in a test S tube. Add water in the test-tube. Shake the test-tube. Test the solution with red and blue litmus paper. Blue litmus paper remains as it is while red litmus paper turns blue. This shows that metal oxides are basic in nature.

2. Metal oxides react with an acid to form salt and water. Therefore, metal oxides are basic in nature.
Metal oxide + Acid → + Water

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Question 35 Marks

How are metal oxides formed? Explain with an example.

Answer

Metals combine with oxygen in the ' air to form their oxides.
Metal + Oxygen $\rightarrow$ Metal oxide
[Note: Reaction/explanation given in the screen are for better understanding of students. The same are not given in the textbook.] When magnesium burns in air, it combines with oxygen to form magnesium oxide.
$2 Mg+O_2 \rightarrow 2 MgO$
Magnesium Oxygen Magnesium oxide

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Question 45 Marks

How are metal ions formed? Give two examples.

Answer

Metals have a tendency to lose their valence electrons to form positively charged ions, called cations.
Examples:

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