Friday, August 25, 2017

CBSE Class 8 - Science - Metals and Non-Metals (Question Bank) (#cbsenotes)

Metals and Non-Metals (Question Bank)

CBSE Class 8 - Science - Metals and Non-Metals (Question Bank) (#cbsenotes)

Name the following questions:
1. Name some common non-metals used in our daily life.

2. Hardest naturally occurring substance.

3. Property of metals which make them useful as electric wires.

4. Non – metal which has metallic luster.

5. Two non metals which are soft solids.

6. Non metals do not conduct electricity or heat except for one . Name it.

7. An allotrope of carbon which is as tensile as steel.

8. Metals that are not attacked by cold water, boiling water or stream.

9. The property of metals by virtue of which these can beaten into sheets.

10. Non metals used in disinfection of drinking water.

II. Answer the following( in one or two words)

1. What are the elements called which can neither fit with metals nor non metals?

2. Which of the following metals is the best conductor of heat and electricity?
      Gold, Silver, Copper, Aluminum

3. Which property of metals makes them useful as ringing bells?

4. Arrange the following elements in order of increasing reactivity.
           Sodium, Magnesium, Copper, Zinc, Aluminum

5. An oxide solution of which of the following elements will turn blue litmus red.

6. Which non-metal is used in making pencil lead?

7. Identify the most reactive and least reactive metal amongst the following:
               Aluminum, Potassium, Copper, zinc, Gold

8. State the nature of oxides of non-metals.

9. Give an example of neutral oxide .

10. Which non metal is kept under water and why?

III. Fill in the blanks

1. The number of metals is much _____________________ than non metals.

2. The smallest unit of an element is known as _________________________.

3. Metals like _____________________ and ____________________ exist in liquid state.

4. Elements which do not react chemically are known as _______________________.

5. Oxides of metals which are acidic as well as basic in nature are called _________ oxides.

IV. Multiple Choice Questions
1. Pb is the symbol of
                  a. Copper 
                  b. Phosphorus 
                  c. Lead

2. Helium, Neon, Argon are
                 a. Metals 
                 b. Noble gases 
                 c. Metalloids

3. Which of the following metal burns with dazzling while flame.
                 a. Sodium 
                 b. Potassium 
                 c. Magnesium

4. Which of the following displaces Hydrogen on reaction with dilute mineral acids.
                 a. Silver 
                 b. Sodium 
                 c. Sulphor

5. Metals which are used for making electric wires and cooking vessels
                 a. Copper and Aluminum 
                 b. Copper and Iron 
                 c. Aluminum

6. Non metals which is used in making microchips
                a. Carbon 
                b. Silicon 
                c. Sulphur

7. Metals which can be cut with knife.
                a. Iron 
                b. Calcium 
                c. Sodium

8. Compounds of which non-metal are used as fertilizers
                a. Chlorine 
                b. Nitrogen 
                c. Phosphorus

9. Alloys of which of the following metal are used for making aero planes and automobile
               a. Copper 
               b. Aluminum 
               c. Iron

10. Metals react with oxygen to form their oxides which are generally.
               a. Neutral in nature 
               b. Acidic in nature 
               c. Basic in nature

Name the following
1. Oxygen, Nitrogen and Carbon
2. Diamond (an allotrope of Carbon)
3. Ductility
4. Iodine
5. Sulphur and Phosphorous
6. Graphite conducts electricity. Diamond good conductor of heat.
7. Diamond
8. Silver, Gold, Platinum
9. Malleability
10. Chlorine

1. Metalloids
2. Silver
3. Sonorous
4. Copper < Aluminium < Magnesium < Zinc < Sodium
5. Non-Metals (e.g. Sulphur Dioxide when added to water forms sulphurous acid)
6. Graphite (a form of carbon)
7. Most reactive: Potassium
    Least reactive: Gold
8. Acidic
9. Sodium Chloride (Table Salt)
10. Phosphorous
     Phosphorus is a very reactive non-metal. It catches fire if exposed to air. To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water. 

III. Fill in Blanks

1. higher
2. atom
3. Mercury and Gallium
4. noble or inert elements
5. amphoteric oxides

1. (c) Lead
2. (b) Noble gases
3. (c) Magnesium
4. (b) Sodium
5. (a) Cu and Al
6. (b) Si
7. Sodium
8. Nitrogen and Phosphorous
9. Aluminum
10. basic in nature.

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