Q13 of 39 Page 1

Using balanced chemical equation give a difference between displacement and double displacement reaction. (CBSE 2012, 2011)

In Double displacement reaction, ion of two compound switch there places to form two new compounds.

NaCl(aq)+ AgNO3→NaNO3 (aq)+AgCL(s)


In single displacement reaction in which more reactive element takes up the place of another element in a compound.


Zn (s)+CuSO4 (aq) →ZnSO4 (aq)+ Cu(s)

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When hydrogen gas is passed over heated copper (II) oxide, copper and steam are formed. Write the balanced chemical equation for this reaction and state

(i) the substance oxidised and


(ii) the substance reduced in the reaction. (2014)


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You might have noted that when copper powder is heated in a china dish, the surface of copper powder becomes coated with a black colour substance.(a) How has this black coloured substance formed?(b) What is that black substance?(c) Write the chemical equation of the reaction that takes place. (CBSE 2011)

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What is the difference between a skeletal equation and balanced chemical equation? Give example. (CBSE 2007)

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When a green iron salt is heated strongly, its colour finally changes to black and odor of burning sulphur is given out.

a. Name the iron salt.


b. Name the type of reaction that takes placed during the heating of iron salt.


c. Write the balanced chemical equation for the reaction involved. (CBSE 2008)