Question

C С
5
ZAOB
IZ AOB and BOD are linear pairs]
3
Write the relation between ZOAB and ZOBA
ed
ZOBA
= ZOAB
[ZDOB is the outer angle at the corner of the triangle AOB]
Write the suitable name of triangle AOB
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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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