(a) Define the terms (i) mineral (ii) ore and (iii) gangue.
(b) What is meant by the concentration of ore?
(c) Name one ore of copper (other than cuprite).White compound of copper is present in this ore? Also, write its chemical formula.

Define the following terms. (i) Mineral (ii) Ore (iii) Gangue

(a) What is the difference betwee a mineral and an ore? (b) Which metal is extracted from cinnabar ore? (c) Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula. (d) How is sodium metal extracted? Explain with the help of equation of the reaction involved. (e) Name three other metals which are extracted in a manner similar to sodium.

(a). Name two metals which occur in nature in free state as well as in combined state. (b). Name one ore of manganese. Which compound of manganese is present in this ore? Also write, its chemical formula. (c) A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved int eh conversion of this concentrated ore into zinc metal.

(a). Name two metals which are found in nature mainly in the free state (as metallic elements) (b) name two metals which are always found in combined state. (c) What iron compound is present in haematite ore? Also write its chemical formula.

A metal X which is resistant to corrosion is produced by the electrolysis of its molten oxide whereas another metal Y which is also resistant to corrosion is produced by the reduction of its oxide with carbon. Metal X can be used in powder form in thermite welding whereas metal Y is used in making cathodes of ordinary dry cells. (a). name the metals X and Y. (b) Which of the two metals is more reactive: X or Y? (c) Name one ore or metal X. also write its chemical formula. (d) name one ore of metal Y. also write its chemcial formula. (e) name one alloy of metal X and one alloy of metal Y.

(a) Name the metal which is extracted from haematite ore. (b) name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula. (c) How is aluminium metal extracted? Explain with the help of an equation. (d) name the electrode at which aluminium metal is produced. (e) Which gas is produced during the extraction of aluminium? at which electrode is this gas produced?

(a) Which metal is extracted from calamine ore? (b) Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula. (c) How is copper extracted from its sulphide ore (coope glance), Cu_(2)S ? Explain with equations of the reactions involved. (d). What is an alloy? Give two examples of alloys. (e) How are the properties of an alloy different from those of the constitutent elements?