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When hydrogen gas is passed over black c...

When hydrogen gas is passed over black copper oxide, a reddish coloured layer of copper is formed. `CuO + H_(2)rarrCu + H_(2)O` Which is the reductant in this reaction'? And which reactant has undergone reduction?

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`H_(2)` is the reductant and CuO has undergone reduction.
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Metals get attacked by substances around it such as moisture, acids, etc. Metal is said to 'corrode' due to this attack and the process is called corrosion. Many metals like iron, copper, silver, etc. get corroded. When iron is exposed to moist air, it undergoes corrosion and a reddish brown coloured solid layer is formed on its surface. Corrosion of iron, which is known as rusting, is a serious problem as enormous amount of money is spent every year to replace damaged iron. Similarly, copper reacts with moisture and. CO_(2) in air to form a green coloured coating of basic copper carbonate on its surface. Silver acquires a black colour when exposed to air containing H_(2)S due to the formation of silver sulphide on its surface. Based on the above paragraph, answer the following question. What happens to silver ornaments if they are exposed to air containing H_(2)S gas?

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Metals get attacked by substances around it such as moisture, acids, etc. Metal is said to 'corrode' due to this attack and the process is called corrosion. Many metals like iron, copper, silver, etc. get corroded. When iron is exposed to moist air, it undergoes corrosion and a reddish brown coloured solid layer is formed on its surface. Corrosion of iron, which is known as rusting, is a serious problem as enormous amount of money is spent every year to replace damaged iron. Similarly, copper reacts with moisture and. CO_(2) in air to form a green coloured coating of basic copper carbonate on its surface. Silver acquires a black colour when exposed to air containing H_(2)S due to the formation of silver sulphide on its surface. Based on the above paragraph, answer the following question. Do gold ornaments corrode? Justify.

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TARGET PUBLICATION-CHEMICAL REACTIONS AND EQUATIONS-Answer the following
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  2. What is the reaction called when oxidation and reduction take place si...

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  3. When hydrogen gas is passed over black copper oxide, a reddish coloure...

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  7. Identify from the following reactions the reactants that undergo oxida...

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  8. BaSO(4)+4CrarrBaS+4CO ln the above reaction, write for each reactant...

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  9. Identify oxidizing agent in the following reactions: Fe(2)O(3)+3COra...

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  10. Identify oxidizing agent in the following reactions: ZnO+CrarrZn+CO

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  11. Identify oxidizing agent in the following reactions: V(2)O(5)+5Carar...

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  12. Identify oxidizing agent in the following reactions: 3Fe+4H(2)Orarr...

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  13. Write the reactions for the following conversion using the symbol (e^(...

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  15. What is rancidity? Mention only two ways by which rancidity can be pre...

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  16. Choose the correct option from the bracket and explain the statement g...

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