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Why do we magnesium ribbon with a sand -...

Why do we magnesium ribbon with a sand - paper before igniting ?

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To remove the layer of oxide and carbonate from the surface.
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Why should a magnesium ribbon be cleaned before burning in air?

Assertion (A) : Magnesium ribbon is cleaned with water before burning . Reason (R ) : MgO layer is formed on magnesium ribbon , on exposure to atmosphere .

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When magnesium ribbon burnt, it produces :

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U-LIKE SERIES-CHEMICAL REACTIONS AND EQUATIONS -VERY SHORT ANSWER QUESTIONS
  1. Write the equation in the symbolic form with state symbols for the fol...

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  2. Balance the following equation : Fe+H(2)OtoFe(3)O(4)+H(2)

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  3. Why do we magnesium ribbon with a sand - paper before igniting ?

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  4. N(2)+3H(2)to2NH(3), name the type of reaction.

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

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  6. On adding dilute hydrochloric acid to copper oxide powder, the solutio...

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  7. Why is respiration considered an exothermic process ?

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  8. If copper metal is heated over a flame it develops a coating. What is ...

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  9. Hydrogen and oxygen gases are produced at the cathode and anode respec...

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  10. Silver chloride on photochemical decomposition produces silver and chl...

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  11. What are exothermic and endothermic reactions ?

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  12. Write a balanced chemical equation to represent the following reaction...

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  13. Which one is a chemical change - fermentation of fruit juice or diluti...

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  14. Tell whether heat is evolved or absorbed when quick lime is added to w...

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  15. Which colour change and smell are observed when crystals of ferrous su...

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  16. Lead nitrate on heating gives lead oxide, nitrogen oxide and oxygen. W...

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  17. Which of the following reactions is oxidation and which is reduction ?...

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  18. In the following reaction, while reactants undergo oxidation and which...

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  19. Is burning of a candle wax a physical change or a chemical change ?

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  20. State one basic difference between a physical change and a chemical ch...

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