• Post category:Udemy (Sept 2021)
  • Reading time:5 mins read

Materials: Metals and Non Metals Class 8 Science NCERT

Description

Q.1. Which of the following can be beaten into thin sheets?

(a) Zinc (b) Phosphorus

(c) Sulphur (d) Oxygen

Q. 2.  Which of the following statements is correct?

(a) All metals are ductile.

(b) All non-metals are ductile.                                           

(c) Generally, metals are ductile.

(d) Some non-metals are ductile.

3. Fill in the blanks.

(a) Phosphorus is a very _________ non-metal.

(b) Metals are conductors of heat and ________.

(c) Iron is _________reactive than copper.

(d) Metals react with acids to produce ______ gas.

4. Mark ‘T’ if the statement is true and ‘F’ if it is false.

(a) Generally, non-metals react with acids.

(b) Sodium is a very reactive metal.

(c) Copper displaces zinc from zinc sulphate solution.

(d) Coal can be drawn into wires.

Q. 5. Some properties are listed in the following table. Distinguish between metals and non-metals based on these properties.

Q. 6. Give reasons for the following.

(a) Aluminium foils are used to wrap food items.

(b) Immersion rods for heating liquids are made up of metallic substances.

(c) Copper cannot displace zinc from its salt solution.

(d) Sodium and potassium are stored in kerosene.


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Q. 7. Can you store the lemon pickle in an aluminum utensil? Explain.

Q.8. Match the substances given in Column A with their uses given in  Column B.

Q. 9. What happens when

(a) Dilute sulphuric acid is poured on a copper plate?

(b) Iron nails are placed in copper sulfate solution?

Write word equations of the reactions involved.

Q. 10. Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.

(a) How will she find the nature of the gas?

(b) Write down word equations of all the reactions taking place in this process.

Q. 11. One day Reeta went to a jeweler’s shop with her mother. Her mother gave old gold jewelry to the goldsmith to polish. The next day when they brought the jewelry back, they found that there was a slight loss in its weight.

Can you suggest a reason for the loss of weight?

English

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Content

Introduction

Introduction

Which can be beaten into thin sheets, which is correct statement, Fill in Blanks

Which can be beaten into thin sheets, which is correct statement, Fill in Blanks

True/False, Distinguish between metals & non metals,

True/False, Distinguish between metals & non metals, Reasons for certain facts

Reasoning questions in respect of aluminium foils, immersion rods, lemon pickle

Reasoning questions in respect of aluminium foils, immersion rods, lemon pickle

Nature of gas on burning charcoal, Weight loss in jewellery after polishing etc.

Nature of gas on burning charcoal, Weight loss in jewellery after polishing etc.