Question

Long Answer Type Questions

1 some deposit were observed in water preserved in aluminium containers after two three days what could the deposite be what is the reason for the formation of these deposit

ans

2. Explain that carbon dioxide is an acidic oxide with the help of an activity.

ans

3. Explain five methods which are used to prevent the rusting of an iron article.

ans

Class 7
​

Answer 1

Answer:

1 The deposits are noticeable because they are not soluble in water. In the case of hard water, the deposits are usually the salt deposits that contribute to the hardness of the water

2 Carbon dioxide has no hydrogen so it is not an acid itself. But like many non-metal oxides, carbon dioxide can dissolve in water to give an acidic solution. Carbon dioxide is an acidic oxide on the basis that it dissolves in water to form carbonic acid, which is an acid.

3 Keep It Clean and Dry. ...

Prevent Scratches. ...

Apply A Protective Coating. ...

Use Stainless Steel. ...

Use Galvanized Metal. ...

Regular Maintenance