Q2 of 17 Page 133

Give scientific reasons.

Stainless steel has more lustre than iron.

(a) Stainless steel is an alloy which is mixture of iron, chromium, carbon and nickel and but iron is metal.


(b) When iron is exposed in moist air a reddish coating is formed on its surface that is called rust and loses its lustre.


(c) Stainless steel prevents from rust and save its lustre property.


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2

Give scientific reasons.

Ships are painted at frequent intervals.

 2

Give scientific reasons.

Gold and platinum are called noble elements.

 3

Match the following.

 4

Fill in the blanks.

(a) Gold of 100% purity is _______ carat gold.


(b) Bronze contains the metals _______ and _______.


(c) The _______ gas is released when metals react chemically with acids


(d) Oxides of metals have _______ properties.


(e) The non-metal _______ is used in gun powder.