Write four important purposes of making alloy. Write the constituents of following alloys : (i) Brass (ii) Bronze (iii) Solder (iv) Stainless Steel.

1) Alloys are made to improve hardness and strength of metals.
2) Alloys are made to improve resistance against corrosion.
3) Alloys are made to impart shine and lustre to a metal
4) Alloys are made to change the physical properties such as melting point of metals.

Constituents of:
(i) Brass  - copper and zinc
(ii) Bronze - copper and tin
(iii) Solder- lead and tin
(iv) Stainless steel - iron, nickel and chromium

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