A reddish-brown vessel developed a green colored solid x when left open in air for a long time. When reacted with dil h2so4, it forms a blue colored solution along with brisk effervescence due to colourless & odourless gas z. X decomposes to form black colored oxide y of a reddish brown metal along with gas z, identify x, y, & z.
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sorry,but can you type the question again and explain the equation. please
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