Detailed description of reaction--- Heating of copper powder in presence of AIR

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Q. Identify the type of chemical reaction taking place and also write the balance chemical equation for : on heating copper powder in air is china dish, a surface of copper powder turns block.

On heating copper powder in air the surface of copper powder becomes coated with black CuO . How can this black coating be converted into brown copper? Write a chemical equation for the reaction that occurs during the colour change.

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Q. Identify

M

and

N

in the following reaction.

C o p p e r g l a n c e c o n t r o l l e d h e a t i n g i n p r e s e n c e o f a i r - --------------------- \to M + S O_{2} ↑

M N - \to C u + S O_{2} ↑

M N - \to C u + S O_{2} ↑

Q. What are the products obtained by heating ethane in:
(a) excess of air
(b) absence of air
(c) air in presence of copper and 120 atm pressure.
(d) air with molybdenum oxide at 100 atm pressure.

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