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Why should a magnesium ribbon be cleaned...

Why should a magnesium ribbon be cleaned before burning in air?

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A megnesium ribbon is cleaned to remove the protective layer of magnesium oxide from its surface so that it may readily combine with the oxygen of air (on heating).
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Assertion (A) : Magnesium ribbon is cleaned with water before burning . Reason (R ) : MgO layer is formed on magnesium ribbon , on exposure to atmosphere .

A burning magnesium ribbon will continue to burn in

(a) Define the following in terms of gain or loss of hydrogen with one example each: (i) oxidatin (ii) reduction (b) When a magnesium ribbon is heated, it burns in air to form magnesium oxide. Write a balanced chemical equation for this reactin. Name (i) substance oxidised, and (ii) substance reduced.

Why does magnesium ribbon start floating in hot water?

Magnesium ribbon on burning in air produces

LAKHMIR SINGH & MANJIT KAUR-CHEMICAL REACTIONS AND EQUATIONS -Exercise
  1. When a strip of red-brown metal X is placed in a colourless salt solut...

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  2. A metal salt MX when exposed to light splits up to form metal M and a ...

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  3. Why should a magnesium ribbon be cleaned before burning in air?

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  4. Write the balanced equation for the following chemical reactions. (i...

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  5. Write a balanced chemical equation with state symbols for the followin...

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  6. A solution of a substance ‘X’ is used for whitewashing. (i) Name t...

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  7. Why is the amount of gas collected in one of the test tubes in Activit...

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  8. Why does the colour of copper sulphate solution change when an iron na...

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  9. Give an example of a double displacement reaction.

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  10. Identify the substances that are oxidised and the substances that are ...

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  11. Which of the statements about the reaction below are incorrect? 2PbO...

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  12. Fe(2)O(3) + 2Al rarr Al(2)O(3) + 2Fe The above reaction is an exampl...

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  13. What happens when dilute hydrochloric acid is added to iron fillings? ...

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  14. What is a balanced chemical equation? Why should chemical equations be...

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  15. Translate the following statements into chemical equations and then ba...

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  16. Balance the following chemical equations: (a) HNO(3)+Ca(OH)(2)toCa(...

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  17. Write the balanced chemical equations for the following reactions: (...

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  18. Write the balanced chemical equations for the following and identify t...

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  19. What does one mean by exothermic and endothermic reactions? Give examp...

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  20. Why is respiration considered an exothermic reaction? Explain.

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