OBJECTIVES
Name the following:
From the list of characteristic given below select the five which are relevant to metals and their compounds.
Minerals
Gangue
Ores
Metallurgy
Roasting
Sonorous.
Malleability.
Ductility.
Anodising.
Ionic bond.
Covalent bond.
Covalent
compound.
Reactivity
series of metals.
Calcination.
Electroplating .
Corrosion.
Alloy.
Galvanising.
Sodium is stored under kerosene.
Gold and silver are used to make jewellery.
Calcium floats over water during the reaction with water.
Ionic compounds have high melting and boiling points
Tarnished copper utensils are cleaned with lime juice or tamarind.
Copper is exposed to air.
Reason for use
of fused cryolite (Na3AlF6) along with fluorspar (CaF2) which is added to the
electrolytic mixture containing pure alumina.
Electrolysis of
active metals like Na, K, Al is not carried out by using aqueous solution of
their chloride.
Elements like
gold, silver are found in free or native state.
Pure water is a
poor conductor of electricity but aqueous solution of NaCl conducts
electricity.
An aqueous
solution of sodium chloride conducts electricity.
Ionic compounds
are formed due to the combination of metals and nonmetals.
Some elements
occur in free state while others occur in the combined state.
Sodium and
chlorine are poisonous substances but sodium chloride is edible.
Aluminium oxide
is an amphoteric oxide.
Kitchen articles
like pressure cooker, pan etc. are anodized.
Sudha dipped a copper coin in a solution of silver nitrate. After some time she saw the silver shine on the coin. Why? Give the balanced chemical equation for the same.
Metal A has electronic configuration of (2,8,1) and metal B has (2,8,8,2) which is more reactive. Identify these metals and vie their reactions with dil HCl.
To obtain (zinc) Zn from zinc sulphide two chemical reaction are involved
When steam is passed over aluminium.
Extraction of copper from its sulphide ore.
Thermit reaction.
When magnesium reacts with hot water.
What happens when aluminium oxide dissolves in aqueous sodium hydroxide?
In the extraction of aluminium
Write two methods of preventing rusting of iron.
What is an alloy? Give two examples with their chemical composition.
Arrange the following metals in the decreasing order of chemical reactivity, Cu, Mg, Fe, Na, Ca, Zn.
Explain the formation of an ionic compound between metal and a non – metal by transfer of electrons with Mg as the metal and Cl as a non – metal to illustrate your answer.
An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns red litmus blue. State whether element X is a metal or a non – metal. Explain with proper example.
Explain the properties of ionic compounds.
Metallurgy
Ore (Text Book)
OXIDES OF METALS
AND NON METALS
Distinguish
between metals and nonmetals with respect to the following points.
Carbon dioxide
and Ammonia.
We can obtain a
fountain of ammonia gas.
Metals are good
conductors, while nonmetals are poor conductors of Electricity.
Carbon dioxide
is used as a fire extinguisher.
When carbon
dioxide is passed through lime water, it first turns milky and then turns
colourless.
A magnesium
ribbon continues to burn brilliantly in a gas jar containing carbon dioxide.
Acidified
solution of potassium dichromate turns green when H2S is passed through it.
Aluminium oxide
is classified as an amphoteric oxide.
Metals have
electropositive character.
Define
How carbon
dioxide gas is prepared in the laboratory
Describe the
method of preparation of hydrogen sulphide using Kipp’s apparatus.
Hydrogen
sulphide gas.
Explain the
stages involved in the extraction of cast iron.
Explain the
stages involved in the preliminary treatment to concentrate iron ore.
State the
physical properties of ammonia.
Give the
physical properties of carbon dioxide.
Write two
physical properties of Hydrogen sulphide.
State the uses
of sulphur.
How does sulphur
occur in nature?
Why must the
anodes be replaced from time to time during the electrolysis of fused alumina?
Why alumina is
dissolved in Cryolite for electrolysis?
Molecules of
sulphur.
Monoclinic
sulphur
Rhombic sulphur
Electrolysis of
fused alumina
Bayer’s process
for concentration of bauxite.
Blast furnace
Answer in one
sentence
Write the
Uses Of
Bleaching
powder.
Plaster of
Paris.
Alum
Blue vitriol
Green vitriol.
Limestone
Washing soda
(Sodium Carbonate)
Baking soda
(Sodium bicarbonate)
State The
Uses Of
Bleaching
Powder.
Plaster of Paris
Alum
Blue vitriol
Green vitriol
Lime stone
Washing soda
Baking soda
Write the
scientific names and molecular formulae of the following.
Plaster of Paris
is used in the laboratories for sealing and making the apparatus airtight.
Alum is used for
purification of drinking water.
Copper sulphate
crystals on heating turn to a white amorphous powder.
Ferrous sulphate
crystals turn white on heating.
Plaster of Paris
is used for making statues and to set the fractured bones at the right
position.
Sodium
bicarbonate is used in fire extinguisher.
Baking powder is
used in the preparation of bread and cake.
Bordeauxmixture is sprayed on fruit trees.
Name the following:
From the list of characteristic given below select the five which are relevant to metals and their compounds.
DEFINE
Minerals
Gangue
Ores
Metallurgy
Roasting
Sonorous.
Malleability.
Ductility.
Anodising.
Ionic bond.
Covalent bond.
Covalent
compound.
Reactivity
series of metals.
Calcination.
Electroplating .
Corrosion.
Alloy.
Galvanising.
Tinning.
GIVE SCIENTIFIC REASONS
Sodium is stored under kerosene.
Gold and silver are used to make jewellery.
Calcium floats over water during the reaction with water.
Ionic compounds have high melting and boiling points
Tarnished copper utensils are cleaned with lime juice or tamarind.
Copper is exposed to air.
Reason for use
of fused cryolite (Na3AlF6) along with fluorspar (CaF2) which is added to the
electrolytic mixture containing pure alumina.
Electrolysis of
active metals like Na, K, Al is not carried out by using aqueous solution of
their chloride.
Elements like
gold, silver are found in free or native state.
Pure water is a
poor conductor of electricity but aqueous solution of NaCl conducts
electricity.
An aqueous
solution of sodium chloride conducts electricity.
Ionic compounds
are formed due to the combination of metals and nonmetals.
Some elements
occur in free state while others occur in the combined state.
Sodium and
chlorine are poisonous substances but sodium chloride is edible.
Aluminium oxide
is an amphoteric oxide.
Kitchen articles
like pressure cooker, pan etc. are anodized.
ANSWER THE FOLLOWING IN DETAIL
Sudha dipped a copper coin in a solution of silver nitrate. After some time she saw the silver shine on the coin. Why? Give the balanced chemical equation for the same.
Metal A has electronic configuration of (2,8,1) and metal B has (2,8,8,2) which is more reactive. Identify these metals and vie their reactions with dil HCl.
To obtain (zinc) Zn from zinc sulphide two chemical reaction are involved
When steam is passed over aluminium.
Extraction of copper from its sulphide ore.
Thermit reaction.
When magnesium reacts with hot water.
What happens when aluminium oxide dissolves in aqueous sodium hydroxide?
In the extraction of aluminium
Write two methods of preventing rusting of iron.
What is an alloy? Give two examples with their chemical composition.
Arrange the following metals in the decreasing order of chemical reactivity, Cu, Mg, Fe, Na, Ca, Zn.
Explain the formation of an ionic compound between metal and a non – metal by transfer of electrons with Mg as the metal and Cl as a non – metal to illustrate your answer.
An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns red litmus blue. State whether element X is a metal or a non – metal. Explain with proper example.
Explain the properties of ionic compounds.
