During the electrolysis the change in colour of copper sulphate solution proves that a chemical change has occurred.

True

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False

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i. At which electrode does colour change occur anode or cathode?

ii. Is there any change in the blue colour of the copper sulphate solution?

iii. Write down chemical equations for the changes occurring here.

Give the chemical equation for the reactions occurring at the anode during the electrolysis of copper sulphate solution using a platinum anode.

3 . W h a t t y p e o f c h a n g e t a k e s p l a c e w h e n a r e a c t i o n o c c u r s b e t w e e n i r o n a n d c o p p e r s u l p h a t e s o l u t i o n ? (a) P h y s i c a l c h a n g e (b) C h e m i c a l c h a n g e (c) B o t h p h y s i c a l a n d c h e m i c a l c h a n g e (d) N o c h a n g e 4 . T h e c o l o u r o f t h e l a y e r d e p o s i t e d o n i r o n n a i l s d i p p e d i n c o p p e r s u l p h a t e s o l u t i o n i s : (a) g r e e n (b) r e d d i s h b r o w n (c) g r e e n i s h b l u e (d) c o l o u r l e s s 5 . T h e l a y e r d e p o s i t e d o n i r o n n a i l s d i p p e d i n c o p p e r s u l p h a t e s o l u t i o n i s d u e t o : (a) i r o n (b) c o p p e r (c) s u l p h u r (d) o x y g e n

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