NCERT Class VIII Science Solutions: Chapter 4-Materials: Metals and Non-Metals Part 3

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Question 7:

Can you store lemon pickle in an aluminium utensil? Explain.

Answer:

No, we cannot store lemon pickle in aluminium utensils, as metals react with acids to liberate hydrogen gas. The pickle (which is acidic in nature) can be spoiled.

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Store Lemon Pickle in an Aluminium Utensil

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Question 8:

In the following Table some substances are given in Column I. In Column II some uses are given. Match the items in column I with those in Column II.

Match the items in column I with those in Column II.

Column I

Column II

Gold

Thermometers

Iron

Electric wire

Aluminium

Wrapping food

Carbon

Jewellery

Copper

Machinery

Mercury

Fuel

Answer:

Match the items in column I with those in Column II.Answer

Column I

Column II

Gold

Jewellery

Iron

Machinery

Aluminium

Wrapping food

Carbon

Fuel

Copper

Electric wire

Mercury

Thermometers