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Oxidation and Reduction

7. 

The oxidizing agent in the following is

A. potassium chloride B. Potassium hydroxide C. potassium carbonate D. potassium dichromate

Answer : D. potassium dichromate

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8. 

Sodium thyosulphate is widely used in photography. Its main role in photopgraphic process is due to

A. Reduction B. Oxidation C. Complex formation D. Photo decomposition

Answer : A. Reduction

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9. 

Combustion is chemically is

A. decomposition B. reduction C. slow oxidation D. rapid oxidation

Answer : A. decomposition

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10. 

Strong reducing agent is

A. H2S B. HCl C. KMnO4 D. K2CrO4

Answer : A. H2S

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11. 

Silver nitrate produces a black stain on skin due to

A. being strong reducing agent B. its corrosive action C. its reduction to metallic silver D. None of these

Answer : C. its reduction to metallic silver

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12. 

Which one of the following is strong oxidizing agent

A. Copper B. Dilute HNO3 C. Acidified K2Cr2O7 D. Al2 O3

Answer : C. Acidified K2Cr2O7

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