Work-sheet

Class XSub: Chemistry

Metallurgy

  1. Name the following :

i)Sulphide ore of iron.

ii)Allotropic modification of carbon and good conductor of electricity.

iii)The process of removing gangue from ore.

iv)Metal rendered passive on reaction with conc. Nitric acid.

v)The process of coating thin layer of zinc over the surface of iron.

  1. Write the composition and use of each of the following:

i)Stainless steel

ii)Brass

iii)Duralumin

iv)Bronze

v)Sodium amalgam

3.With reference to the manufacture of aluminium during its extraction ,answer the following:

i) In what way, corundum differ from bauxite?

ii) Name two methods employed for purification of the ore.

iii) Write the composition of the electrolytic bath and state the function of each.

iv) Name the anode used.

v) What is the function of carbon powder in the bath?

vi)Write the ionic equation for each of the component of the electrolyte.

vii)Write the reaction that take place at the cathode and anode.

  1. Give one example of ore as :

i)Oxide

ii)Halide

iii)Sulphide

iv)Carbonate

v)Sulphate

vi)Nitrate

  1. Aluminium cannot br extracted by the reduction of its ores by carbon.Explain.
  2. Match the following:

Metal /alloy uses

i)Aluminium Steel making

ii) Lead Aeroplanewings

iii)Brass Galvanizing

iv)Iron Radiation shield

v)Zinc Electrical fittings

7. Name the following:

i) A lightest metal

ii) A metal which makes amalgam

iii) Alight metal used in duralmin

iv) A metal mixed with copper to make brass.

v)A metal used for galvanizing iron.

vi)A non-metal which is good conductor of electricity.

vii)Alloys of mercury.

viii)A non-metal which forms neutral oxide.

ix)A metal which will give hydrogen when treated with caustic soda.

x) Particles found in the solution of sodium chloride.

xi)An allotrope of the non-metal conducts electricity.

  1. How would you distinguish between :

i)Zinc oxide and calcium oxide

Acidic oxide and a soluble basic oxide

  1. Compare the general properties of the metals and non-metals ,with a special reference to their density ,luster ,electrical conductivity and electro-chemical nature.
  2. Name the property of a metal by virtue of which it :

a)Can be beaten into thin sheets.

b)Can be drawn into wires.

c)Is liberated at cathode.

Study of compounds

Q1.What happens when:

i)Hot and Conc. Sulphuric acid added to sugar crystals.

ii)Magnesium nitride is shaken with hot water.

iii)Ammonia is passed over hot Copper (II) Oxide.

iv)Ammonia gas is bubbled through red litmus solution.

v)Hydrochloric acid is added to silver nitrate solution.

vi)Nitric acid is kept in a reagent bottle for a long time.

vii)Nitrogen dioxide is passed through acidified freshly prepared sulphate solution.

viii)Conc .HNO3comes in contact with the skin.

ix)Nitric oxide comes in contact with atmosphere.

x)Conc.H2SO4 is slowly added from the sides of the test-tube containing a solution of nitrate and equal volume of freshly prepared ferrous sulphate solution.

Q2.Write the equations for the following reactions:

i)Dilute nitric acid and copper.

ii)Dilute sulphuric acid and barium chloride

iii)Dilute hydrochloric acid and sodium thiosulphate

iv)Dilute sulphuric acid and sodium sulphide.

v)Dilute hydrochloric acid and lead nitrate solution.

vi)Ammonia oxidized by metal oxide.

vii)Ammonia oxidized by a gas which is not oxygen.

viii)Zinc oxide is treated with sodium hydroxide.

ix)Magnesium sulphate solution treated with barium chloride solution.

x)Potassium hydrogen carbonate and dilute sulphuric acid

xi)Sodium nitrate and conc.sulphuric acid.

xii)Dilute nitric acid and copper carbonate

xiii)Ammonia and Oxygen in the presence of a catalyst.

xiv)Conc. Sulphuric is heated with sulphur.

xv)Ammonia to nitrogen

xvi)Glucose to charcoal

xvii)SO2 sodium sulphite

Q3. Give reasons:

I)Nitric acid becomes pale yellow on standing.

II)HCl gas fumes in air

III)Excess ammonia gives white fumes with Cl2

iv)Ammonia is collected by the downward displacement of air.

vi)Conc. Sulphuric acid is used to prepare nitric acid.

vii)Iron is rendered passive with fuming nitric acid.

viii)Hydrogen chloride gas cannot be dried over quick lime.

ix)Tap water is not used to prepare a solution of silver nitrate in the laboratory.

Q4. Write balanced chemical equation for the laboratory preparation of :

i)Hydrogen chloride gas. Ii) Ammonia gas

Q5. Write the possible reactions involved along with conditions for the following manufacturing process:

i)Contact process

ii) Ostwald’s process

iii) Haber’s process

Q6.i) Describe ring test? Ii) What is aqua regia?

Q7. I) Which property of hydrogen chloride is demonstrated by the fountain experiment .

ii)State the colour of the water that has entered the round bottomed flask.

iii)Write the observations and balanced equation of the following reaction: Excess of ammonium hydroxide is added to a substance obtained by adding hydrochloric acid in silver nitrate solution.

Q8. I) Explain why only all glass apparatus should be used for the preparation of nitric acid by heating conc. sulphuric acid and potassium nitrate.

ii) Write a chemical equation to illustrate the acidic nature of nitric acid.

iv)Name the products formed when ammonium nitrate is heated.

Q9. In the laboratory preparation of hydrochloric acid ,HCl gas is dissolved in water.

i)Draw a diagram to show the arrangement used for the absorbtion of HCl in water.

ii)Why is such an arrangement necessary? Give two reasons.

iii)Write the chemical equation for the laboratory preparation of HCl gas when the reactants are : a) below 200oc b) above 200oc

Q10. The questions below are related to the manufacture of ammonia.

i)Name the process.

ii)In what ratio must the reactants be taken.

iii)Name the catalyst used.

iv)Give the equation for the manufacture of ammonia.

v)Ammonia can act as a reducing agent –write a relevant equation for such a reaction.

Q11.i)Name the process used for the large scale manufacture of sulphuric acid.

ii) Which property of sulphuric acid accounts for its use as a dehydrating agent?

iii) Conc. Sulphuric acid is both an oxidizing agent and a non-volatile acid.Write one equation each to illustrate the above mentioned properties of sulphuric acid.

iv)Name the catalyst which helps in the conversion of sulphur dioxide

tosulphur trioxide .

v)In the Contact process for the manufacture of sulphuric acid, sulphur trioxide is not converted to sulphuric acid by reacting it with water. Instead, a two steps procedure is used .Write the equations for the two steps involved.

vi)State the property of sulphur dioxide which causes potassium permanganate to change its colour from purple to colourless.

vii)Name the acid formed ,whensulphur dioxide is dissolved in water.

Acids ,bases and salts

Q1.Define the following terms: i) Acid ii) deliquescent

iii) efflorescence iv) acid salt v) hygroscopy vi)Base vii) alkali viii) pH scale

viii)neutralization

Q2. Name the process carried out to prepare each of the following salts in the lab:

i)Copper sulphate

ii)Sodium chloride

iii)Lead carbonate

iv)Ferrous sulphide

v)Ferric chloride

vi)Calcium carbonate

Q3.Match the following:

  1. Acid salt A. Ferrous ammonium sulphate
  2. Double salt B. Contains only ions
  3. Ammonium hydroxide sokution C. Sodium hydrogen sulphate
  4. Dilute hydrochloric acid D. Contains only molecules
  5. Carbon tetra chloride E. Contains ions and molecules

Q4.What is meant by amphoteric oxide? Give two examples.

Q5. Draw the electron dot diagram for ammonium ion.

Q6. Write chief observation and chemical equation when:

i)Ammonium hydroxide is added to copper sulphate in drops and then in excess.

ii)Caustic soda solution is added to zincsulphate solution drop by drop then in excess.

Q7. Name :

i)An amphoteric oxide

ii)A saltof zinc which is efflorescent

iii)An alkali

iv)The ion responsible for the blue colour of an aqueous solution of a salt.

Q8. Name the gas evolved out in each case when:

i)Dilsulphuric acid is treated with sodium bicarbonate.

ii)A chloride is heated with conc.sulphuric acid

iii)Potassium nitrate crystals are heated with conc. Sulphuric acid.

iv)A mixture of sodium carbonate and very dilute hydrochloric acid is shaken in a test tube.

v)For each of the conversion below , give equations:

i)Copper oxide to Copper

ii) copper oxide to copper sulphate

iii)Potassium sulphate from potassium hydroxide

lv) Lead chloride from lead carbonate(two steps)

Q9.Solution P has a pH of 13,solution Q has a Ph of 6 and solution R has

pH of 2.

i)Which solution will liberate ammonia from ammonium sulphate ?

ii)Which solution is a strong acid?

iii)Which solution contains solute molecules as well as ions.

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