A.Tick the correct answer:-

1 d 2 b 3c 4 c 5 c

B. Differentiate between the following:-

1. Metals have the properties of luster, ductility and sonorous etc. Whereas non metals do not possess this properties.

2. Minerals are the metals combined with impurities like earth,sand etc.

     Ore is the substance from which metals can be obtained profitably.

3. Malleability is the property in which metals can be made into sheet.

   Ductility is the property in which metals can be drawn into wires.

4. Noble metals have noble properties of non reacting with other non metals or metals etc e.g. gold.

Metalloids are substances which show both properties of metals and non metals.e.g. silicon ,germanium.

C. give one word answer for each of the following:-

1. Gangue 2. Tensile strength 3. Oxidation 4. Zari works 5. Hydride

D. Match column A with column B:-

1. Noble metal 2. Bauxite 3. Basic 4. Lustrous 5.Acidic in nature

E. Give two examples for each of the following:-

1. Sodium, Potassium 2. Carbon, Sulphur , 3.Solder,German silver 4. Hematite, Bauxite 5. Calcium,Sodium 6. Gold,Silver

F. Give reasons for each of the following:-

1. Because gold is a noble metal does not react with other non metals easily. But iron combines with oxygen to form oxides.

2. Because metals are good conductor of heat where as wood is an insulator of heat energy.

3. Because sodium is very reactive metal and loss electron easily to form oxide.

           But iron does not react with oxygen so easily to form oxides.

4. The reason is silver is costlier and occur in nature less  abundantly.

G. Write true or false:-

1. False 2. False 3. False 4. True 5. True

H. Circle the odd one out:-

1. Sulphur 2. Graphite 3. Metal 4. Hydrogen 5. Carbon dioxide

I. Fill in the blanks:-

1. Metals 2. Galvanize 3. Bad conductor 4. Mercury 5. Acid 6. Bleaching powder

J. Short answer questions:-

1. Elements are classified as metals, non metals and metalloids.

2. Metals are substances having property of lustre, ductility, sonority  etc. They are occur in nature both as combined state like chloride, sulphide, oxides etc as well as in free state.

3. Uses:-

1. As thermometic substances

2. Making jewellery

3. As electrical conductors

4. Making iron tools.

4. Iron, copper, silver react with atmospheric oxygen to form oxides. This property is termed as corrosion.e.g

Iron+oxygen---->iron oxide(Fe₂O₃)

5. Non metals are substances which have no lustre, does not show ductility, etc.

         They are occur as combined state in nature.

6. Uses of non metals:

1. Oxygen for respiration

2. Nitrogen and phosphorus as fertilizer

3. Chlorine as water purification 

4. Sulphur for making sulphuric acid(H₂SO₄)

7. Noble metals like gold which does not react with other non metals, or metals easily.

        Alloys are mixture of two or more metals e.g  German silver.

   Metalloids are substance which shows the properties of both metal and non metals.e.g germanium.

K. Long answer questions:-

1. Metals are usually solids except Mercury

Metals produce sound on striking with each other e.g . Metal bells in temples.

They have shiny look so they are used in making jewellery.

Metals have high density.

Most of the metals are hard except sodium, potassium, calcium.

Metals have high boiling point and melting point.e.g tungsten is used as electric light filament.

Metals have good electrical and thermal conductivity e.g aluminium

2. Chemical properties of metals

Metals react with oxygen to form oxides 

2Mg+O--->2MgO ( Magnesium oxide)

Metals react with water to form hydrogen gas

Na+H₂o---->NaOH+H₂

Metals react with acid to give hydrogen 

Mg+H₂O---->MgSO₄+H₂.

3. Physical properties of non metals:

 Physical state-They occur as solid, liquid and also as gaseous state.

Sonorous- Non metals are non sonorous

Density- Non metals are soft, light with low density except diamond and iodine 

Electrical and thermal conductivity-Except graphite, all non metals are bad conductor of heat and electricity.

Colour-Some of the non metals exhibit colours while some are colourless.

Hardness-Non metals are soft but diamond is an exception. It is the hardest substance.

Melting point-All non metals have low melting point except diamond and graphite.

4. Chemical properties of non metals:

Reaction with oxygen

S+O₂--->SO₂

Reaction with hydrogen

2H₂+O₂(electricity)--->2H₂O

Reaction with water-Non metals generally do not react with water exception is

C (carbon red hot)+H₂O(steam)---->CO+H₂(water gas)

5. Displacement, replacement or substitution reactions. They are of two types

A. Single displacement-in this process one element displaces another element from a compound and takes its place

Zn+H₂SO₄-->ZnSO₄+H₂

B. Double displacement-these are reaction where part of one reactant is replaced by part of another reactant in both the compounds

NaNO₃+Agcl-->AgNO₃+Nacl

NaNO₃-sodium nitrate

Agcl-silver chloride

AgNO₃-silver nitrate

Nacl-sodium chloride

Displacement reactions of metal

Fe(iron)+CuSO₄( copper sulphate)-->FeSO₄(iron sulphate)+Cu(copper)

Displacement reaction of non metal

Cl₂+2NaBr-->2Nacl+Br₂

Cl-chlorine

NaBr-sodium bromide

Nacl-sodium chloride 

Br-bromine