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What is rust ?...

What is rust ?

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It is a brown mass known as hydrated ferric oxide. Its formula is `Fe_(2)O_(3).xH_(2)O`.
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DINESH PUBLICATION-CHEMICAL REACTIONS AND EQUATIONS -Very Short Answer Questions
  1. Why does not a wall immediately acquire a white colour when a coating ...

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  2. What is rust ?

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  3. Identify the most reactive and least reactive metal : Al, K, Ca, Au.

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  4. Which of the following is a combination and which is a displacement re...

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  5. What is the difference between the following two reactions ? (a) Mg ...

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  6. Identify the compound which is oxidised in the following reaction H(...

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  7. Suggest two ways to check the rancidity of food articles.

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  8. Name two metals which donot get corroded.

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  9. Identify the substance oxidised and reduced in the reaction : CuO(s)...

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  10. How will you know whether a sample of cheese has become rancid or not ...

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  11. Why are eatables preferably packed in aluminium foils ?

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  12. What happens chemically when quick lime is added to water ?

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  13. Give an example of exothermic reaction.

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  14. Give an example of endothermic reaction.

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  15. Name the gas that can be used for the storage of fresh sample of chips...

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  16. Name the type of reaction N(2)(g) + 3H(2)(g) to 2NH(3)(g)

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  17. Give an example of a double displacement reaction (only) reaction with...

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  18. In the reaction MnO(2) + 4HCl to MnCl(2) + 2H(2)O + Cl(2), identify wh...

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  19. Name two salts that are used in black and white photography.

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  20. State the chemical change that takes place when lime stone is heated

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