Science and Technology I · Textbook solutions

Metallurgy

Every solved example, exercise, and miscellaneous question — in the order the textbook teaches them. · 33 questions

Exercise

33 q
  1. Write names.
    Ex Q1(a)
    Alloy of sodium with mercury.
  2. Ex Q1(b)
    Molecular formula of the common ore of aluminium.
  3. Ex Q1(c)
    The oxide that forms salt and water by reacting with both acid and base.
  4. Ex Q1(d)
    The device used for grinding an ore.
  5. Ex Q1(e)
    The nonmetal having electrical conductivity.
  6. Ex Q1(f)
    The reagent that dissolves noble metals.
  7. Ex Q2
    Make pairs of substances and their properties
    SubstanceProperty
    a. Potassium bromide1. Combustible
    b. Gold2. Soluble in water
    c. Sulphur3. No chemical reaction
    d. Neon4. High ductility.
  8. Ex Q3
    Identify the pairs of metals and their ores from the following.
    Group AGroup B
    a. Bauxitei. Mercury
    b. Cassiteriteii. Aluminium
    c. Cinnabariii. Tin
  9. Explain the terms.
    Ex Q4(a)
    Metallurgy
  10. Ex Q4(b)
    Ores
  11. Ex Q4(c)
    Minerals
  12. Ex Q4(d)
    Gangue.
  13. Write scientific reasons.
    Ex Q5(a)
    Lemon or tamarind is used for cleaning copper vessels turned greenish.
  14. Ex Q5(b)
    Generally the ionic compounds have high melting points.
  15. Ex Q5(c)
    Sodium is always kept in kerosene.
  16. Ex Q5(d)
    Pine oil is used in froth flotation.
  17. Ex Q5(e)
    Anodes need to be replaced from time to time during the electrolysis of alumina.
  18. Ex Q6
    When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation.
  19. Ex Q7
    The electronic configuration of metal ‘A’ is 2,8,1 and that of metal ‘B’ is 2,8,2. Which of the two metals is more reactive? Write their reaction with dilute hydrochloric acid.
  20. Draw a neat labelled diagram.
    Ex Q8(a)
    Magnetic separation method.
  21. Ex Q8(b)
    Froth floatation method.
  22. Ex Q8(c)
    Electrolytic reduction of alumina.
  23. Ex Q8(d)
    Hydraulic separation method.
  24. Write chemical equation for the following events.
    Ex Q9(a)
    Aluminium came in contact with air.
  25. Ex Q9(b)
    Iron filings are dropped in aqueous solution of copper sulphate.
  26. Ex Q9(c)
    A reaction was brought about between ferric oxide and aluminium.
  27. Ex Q9(d)
    Electrolysis of alumina is done.
  28. Ex Q9(e)
    Zinc oxide is dissolved in dilute hydrochloric acid.
  29. Complete the following statement using every given options. During the extraction of aluminium…………..
    Ex Q10(a)
    Ingredients and gangue in bauxite.
  30. Ex Q10(b)
    Use of leaching during the concentration of ore.
  31. Ex Q10(c)
    Chemical reaction of transformation of bauxite into alumina by Hall’s process.
  32. Ex Q10(d)
    Heating the aluminium ore with concentrated caustic soda.
  33. Ex Q11
    Divide the metals Cu, Zn, Ca, Mg, Fe, Na, Li into three groups, namely reactive metals, moderately reactive metals and less reactive metals.