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Question 1

Name some common metals.

Iron, copper, aluminium, zinc, nickel, mercury silver gold.


Question 2

Name some common non-metals.

Carbon chlorine nitrogen oxygen sulphur iodine.


Question 3

Name some properties of metals.

Metals are generally solid, hard, ductile,malleable ,have metallic luster, are sonorous and good conductors of heat and electricity.


Question 4

Name the metals which are used to make ornaments

Gold, silver.


Question 5

Metals are hard to cut except two metals. Name such metals

Sodium and potassium.


Question 6

Except one, all metals are solid. Name the metal and its state of existence

Mercury is a liquid.


Question 7

Non-metals do not conduct heat or electricity except one. Name the non-metal

Carbon as graphite, conduct heat and electricity.


Question 8

Name two non-metals which are soft solids

Sulphur and iodine are soft solids.


Question 9

What happens when you hammer a metal and a non-metal?

When you hammer a metal, it is converted into sheets. When you hammer a non – metal it breaks away easily.


Question 10

Are the ringing bells in temples made of metal or non-metal?



Question 11

Name one non-metal which has metallic luster



Question 12

Of the following metals and non-metals which one occurs in liquid state at ordinary temperature?

Copper, aluminium, mercury, iodine, sulphur, bromine

Mercury – metal

Bromine – nonmetal.


Question 13

What do you mean by ductility? Which substances show that property.

The property which allows a substance to be drawn into wires is called ductility. Metals show ductility. For example copper aluminium and iron can be drawn into when hot.


Malleability is a property of beating a metal into sheets. For example if you are given a piece of any metal – iron, copper, zinc or aluminium and beat it with a hammer it become longer and larger and do not break. Thus metals can be obtained as thin sheets.


Question 15

If you put one end of a rod of a metal in hot water, you feel hot at other end. What does it mean? What is this property of metals called?

The above observation means that heat is transferred from one end to the other this property of metals is called conductivity.


Question 16

What property of metals makes them useful as electric wires?

Good electrical conductors.


Question 17

Which of the following metals are the best conductors of heat and electricity?

gold, silver copper aluminium



Question 18

Which property of metals make them useful as ringing bells?


Question 19

Name the property of the metals by virtue of which these can be beaten into sheets



Question 20

Name the property of the metals by virtue of which it can be drawn into wires



Question 21

What are the elements called which can neither fit with metals or non metals?




Arsenic, antimony, silicon and germanium.


Question 23

Aluminium metal is nowadays widely used for making household utensil and electric wires. What is your inference of aluminium as a metal?

Aluminium metal is a good conductor of heat and electricity.


Question 24

Some non-metals like phosphorus are kept in water to protect them from atmospheric oxygen. State the property of the non-metals utilized here.

Non-metals do not react with water.


Metals react with acids. So foodstuffs with acid components may produce poisonous materials on reaction with metals. Hence such foodstuffs are not stored in metallic containers.

Question 26

A substance was burnt in air. The white residue obtained was added to water. This water solution turned red litmus into blue. State whether the substance is a metal or a non-metal?


Question 27

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

Calcium sulphur iron sodium.


Question 28

Name a metal that is not attacked by cold water, boiling water or steam.


Question 29

Name one metal that decomposes boiling water and not cold water


Question 30

Arrange the following metals in the order of their decreasing chemical activity: magnesium, iron, gold

Potassium > magnesium > iron > gold.

Question 31

What would you observe when a strip of zinc is dipped in the solution of copper sulphate?

It will be observed that blue colour of the copper sulphate solution starts fading and zinc strip gets a shiny brown coating of copper.

Question 32

Can copper displace iron from iron sulphate solution? Give reason

No, because copper is less reactive than iron. It is only more reactive metal displaces a less reactive metal from its compound in aqueous solution.

Question 33

Why do some metals replace the other metals from their solutions?


Because of the difference in the reactivity, some metals replace the less reactive metals. More reactive metal replaces the less reactive metal from its solution.

Question 34

Name a metal that replaces silver from silver nitrate solution. Give its equation and reason also.

Copper replaces silver from silver nitrate solution. Silver gets deposited over copper. This reaction is used in silver electroplating over copper articles. This happens because copper is more reactive than silver


Question 35

Why is tincture iodine applied on wounds?

Tincture iodine is a solution of iodine in alcohol. It has antiseptic properties and, is therefore, applied on wounds to protect from germs.

Question 36

Explain the use of chlorine in water purification plants.

Chlorine has the ability to kill germs. Hence it is used in water purification plants.

Question 37

Why is aluminium used in making airplanes?

Aluminium mixed with other metals gives a hard substances with a low density and, is therefore, very suitable in making airplanes.

Question 38

In what form iron is used in big buildings?

Iron in the form of steel along with cement gives reinforced concrete. This gives enough strength to big buildings.

Question 39

Why is aluminium nowadays replacing copper for use in electrical cables?

Aluminium is cheaper and is making a good substitute for copper.

Question 40

Why are metals, used in making machinery?

Metals are strong ,hard and rigid.

Question 41

What metals are used in making cooking utensils and water boilers?

Iron copper and aluminium.

Question 42

Which metals are used for making fine electrical contacts in computers and solar cells?

Gold and silver.

Question 43

How much light is reflected back by mirrors coated with silver?


Question 44

What makes aluminium useful for wrapping of food items?

Aluminium can be converted into thin sheets which can be folded into any shape then it is readily available at affordable cost.

Question 45

What are coinage metals?

Copper, nickel zinc etc are coinage metals. Nowadays coins are made from suitable combination of these metals.

Question 46

Name the common nonmetals that are used in our daily life directly or indirectly

Oxygen, nitrogen chlorine sulphur and iodine.

Question 47

Give two reasons for aluminium being preferred to copper for manufacturing cooking utensils.

Aluminium is unaffected by acids present in certain food items . It is a cheap metal.

Question 48

Why does an aluminium vessel loose its shine so soon after use?

Aluminium is a reactive metal. As it comes in contact with air, it forms a dull and hard layer of aluminium oxide on its surface and hence looses its shine.

Question 49

Silver does not combine easily with oxygen but silver jewellery tarnishes after sometime? Why?

Silver does not combine with oxygen easily but jewellery exposed to atmosphere tarnishes black after some time because it reacts with gases like hydrogen sulphide in air to form silver sulphide which is black.

Question 50

Which one of the following materials is most likely to be corroded?

a. a wooden plank              b. a steel chair

c. an exposed iron rod       d. an iron rod coated with oil.

(c) an exposed iron rod.

Question 51

What is corrosion? What are the ways to retard this process?

Corrosion: metals when kept exposed to most air, get affected and a dull layer of oxide deposits over their surface. This layer is loose and peels off subsequently giving space for formation of more of such layer. In this way, the metal gets wasted layer to layer. This is called corrosion.

Ways to retard corrosion: corrosion can be prevented by keeping the metal out of the reach of moist air. The following are the ways to reduce the changes of corrosion

  • by painting metal surfaces with paints
  • by applying a layer of grease or oil on metal surfaces
  • by galvanizing
  • by electroplating
  • metal can be prevented from rusting by alloying
  • Question 52

    Compare the properties of metals and nonmetals with respect to malleability, ductility and conductivity




    1. malleable – gives sheets on hammering

    Brittle – no sheets can be obtained

    2. ductile – can be transformation into wires Not ductile – no wires can be obtained
    3. good conductors of heat and electricity Bad conductors of heat and electricity

    Question 53

    Taking the examples of magnesium and sulphur explain how metals and non-metals produce oxides with different characteristics.

    i. Magnesium is metal. It burns in oxygen to produce basic magnesium oxide, MgO. When its is added to water, it produces a magnesium hydroxide which turns red litmus solution blue

    ii. sulphur is a non-metal with oxygen it forms acidic oxide it gets changed into sulphurous acid on reacting with water. This turns blue litmus solution red. Red litmus solution remains unaffected

    Question 54

    Give some differences with examples between metals and non-metals with reference to their physical properties. Give one exception in each case.



    Exception: carbon as diamond is a non-metal but has a most shining look. Iodine is another non-metal which gives shining crystals

    Exception: mercury is a liquid metal at room temperature and not malleable .

    Exception: mercury is a metal but not ductile

    Exception: graphite is a non-metal but is a good conductor of heat and electricity

    Exception: metals like sodium or potassium are quite soft and can be easily with a knife. Diamond (a form of non-metal carbon) is the hardest substance know to human.

    • Metallic Luster: metals have a shining surface called metallic luster. Non metals have dull appearance. Metals like silver, gold have shining appearance. Non-metal like sulphur has dull appearance
    • Malleability: metals are malleable. They can be beaten into sheets. But non-metals cannot be beaten into sheets. They break into pieces when hammered. They are not malleable. Metals like gold, aluminium, copper etc. form sheets when hammered
    • Ductility: metals are ductile. They can be drawn into wires. Non-metals cannot drawn into wires
    • Conductivity: metals are good conductors of heat and electricity while non-metal are bad conductors of heat and electricity
    • Hardness: metals are usually hard while non-metals are brittle and can be easy broken into pieces or converted into powder


    Question 55

    Discuss some chemical properties of metals

    Reaction with air: i. metals are converted into their oxides by the action oxygen present in air


    ii. some metals are not affected by dry air. Zinc and aluminium are oxidized in moist air by to form their oxides


    iii. some metals like magnesium and calcium form oxides when heated in air


    Water solutions of alkali oxides are basic and turn red litmus blue

    2. Reaction with hydrogen: active metals like Na, K, Ca, Mg, etc react with hydrogen to form their hydrides when heated at a temperature of 400° C and 200 atmosphere pressure


    3. Reaction with water: different metals react with water at different temperature liberating hydrogen. Some metals react with water at room temperature and some metals which are less active react with hot water while other metals react only with steam

    i. sodium , calcium react with water at room temperature. Sodium burns in water to give sodium hydroxide


    ii. iron magnesium and zinc are not affected by cold water. They are reacted upon by steam only


    Zinc and iron react very mildly with steam whereas copper, silver and nickel do not react with water

    4. Reaction with acids

    i. with hydrochloric acid: metals like sodium, magnesium zinc iron react with hydrochloric acid to form metal chloride and hydrogen gas

    ii. with dilute sulphuric acid: more active metals when treated with dilute sulphuric acid give hydrogen


    iii. with conc sulphuric acid: concentrated sulphuric acid reacts with less active metals like silver, copper, mercury to give metal sulphate and sulphur dioxide


    iv. with dilute nitric acid: more active metals like sodium, potassium, calcium, etc. when treated with dilute nitric acid form metal nitrate and nitrous oxide

    less active metals when treated with dilute form metal nitrate and nitric oxide. Copper
    silver and lead behave in this way



    v. with conc. Nitric acid: metals whether more active or less active form metal nitrate and nitrogen dioxide when treated with conc. Nitric acid


    5. Reaction with sulphur: sulphur reacts with metals and convert them into their sulphides

    Sodium is converted into white sodium sulphide

    Question 56

    State some chemical properties on the basis of which metals can distinguished from non-metals.




    Metals from basic oxides with oxygen which turn red litmus blue

    Metals react with acids to form salt and hydrogen gas

    Metals are electropositive in nature


    Metals from unstable hydrides

    Metals form hydroxides in water

    Non-metals form acidic oxides with oxygen which turn blue litmus red

    Non metals do not react and if reacts, it form corresponding acids

    Non metals are electronegative in nature

    Non metals form stable hydrides

    Non metals do not react with water

    Question 57

    Write some chemical properties of non metals

    Reaction with air: non metals react with air to form non metallic oxides acidic oxides. These oxides turn blue litmus red

    ii. reaction with hydrogen: non metals like nitrogen carbon and phosphorus react with hydrogen to form different compounds

    iii. reaction with acids: some non metals react with acids to form corresponding oxy-acids

    iv. Reaction with non metals: non metals react with other non metal element form their corresponding compounds

    v. reaction with basic oxides: non metals like carbon react with basic oxides to reduce them to metal and carbon monoxide

    Question 58

    List different uses of metals that you come across in everyday life


    Uses of Metals:
  • iron alloyed with other metals is used in trains, automobiles, aeroplanes, satellites and industrial gadgets 
  • iron in the form of steel and in conjunction with cement is used to construct big buildings 
  • aluminium and its alloys are used in making household items and aeroplanes 
  • metals like copper iron and aluminium are used in making cooking utensils and water boilers 
  • copper and aluminium are used in electric wires 
  • gold and silver are used in making electrical contacts in computers and solar cells 
  • gold and silver are used in jewellery 
  • aluminium foils are used as packing material 
  • in combined form metals are used as salt, cement and glass
  • Question 59

    Mention the metals which are used for the following purpose

    i, domestic utensil and factory equipments

    ii. jewelleries

    iii. packaging food materials

    iv. transport of electricity

    v. making of mirrors

    vi. photography.

    i) iron, aluminium, copper

    ii) gold and silver

    iii) thin foils of aluminium

    iv) Aluminium and copper cable

    v) silver salts .

    Question 60

    Choose appropriate words from the bracket and complete the statements

    i. noble gases are found in (free state / compound forms)

    ii, non metals are generally (malleable / brittle)

    iii. potassium after combustion will form (Acidic oxide / basic oxide)

    iv. (iodine / bromine) has antiseptic properties

    v. German silver has (copper / silver) as major constituent’.

    i)  noble gases are found in free state

    ii) non metals are generally brittle

    iii) potassium after combustion will form basic oxide

    iv) iodine has antiseptic properties

    v) German silver has copper as major constituent

    Question 61

    Give reasons for the following


    i. silver is used in making mirrors

    ii. aluminium is used to make electrical wires

    iii. food stuffs with acid components should not be stored in aluminium utensils

    iv. iron is used in constructing bridges and houses

    v. graphite is used as an electrode in the dry cell

    vi. Iron sheets are galvanized before use.

    i) silver has a high reflecting power

    ii) aluminium is a good conductor of electricity

    iii) acids react with aluminium

    iv) iron is a hard strong and rigid metal

    v) graphite is a good conductor of electricity

    vi) iron on exposure to atmosphere gets rusted.

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