A compound X metal oxide is black coloured solid. It reacts with dil. hydrochloric acid and the blue-green coloured solution is formed due to the formation of Y. Identify X and Y and write the chemical reaction involved.

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Solution

$A c o m p o u n d X m e t a l o x i d e i s b l a c k c o l o u r e d s o l i d . I t r e a c t s w i t h d i l . h y d r o c h l o r i c a c i d a n d t h e b l u e g r e e n c o l o u r e d s o l u t i o n i s f o r m e d d u e t o t h e f o r m a t i o n o f Y . A s t h e r e i s f o r m a t i o n o f b l u e g r e e n c o l o u r e d s o l u t i o n i t i s c o p p e r c h l o r i d e . T h e m e t a l o x i d e i s C u O w h i c h i s b l a c k i n c o l o u r . W h e n c o p p e r o x i d e r e a c t s w i t h d i H C l i t f o r m s C u C l_{2} C u O + 2 d i l H C l \to C u C l_{2} + H_{2} O X = C u O Y = C u C l_{2}$

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