Question

The ordered pair (a, b)(a,b)left parenthesis, a, comma, b, right parenthesis gives the location of point PPP on the coordinate plane. The values of aaa and bbb have the same sign. Neither aaa nor bbb is 000.

Where could point PPP be located on the coordinate plane?

Answer 1

Anodising is a process of forming a thick oxide layer of aluminium. Aluminium

develops a thin oxide layer when exposed to air. This aluminium oxide coat makes it

resistant to further corrosion. The resistance can be improved further by making the

oxide layer thicker. During anodising, a clean aluminium article is made the anode

and is electrolysed with dilute sulphuric acid. The oxygen gas evolved at the anode

reacts with aluminium to make a thicker protective oxide layer. This oxide layer can

be dyed easily to give aluminium articles an attractive finish.

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