Ques 1: Complete the reaction: Pb(No3)2------->
Ans 1: 2Pb(No3)2-------->2Pbo+4No2+o2
Ques 2: Write the balanced chemical equation for the following and identify the type of reaction in each case?
1.Zinc carbonate(s)---->Zinc oxide(s)+Carbon dioxide(g)
Ans: 2Znco3---->2Zno2+Co2 (Decomposition reaction)
2.Hydrogen(g)+Chlorine(g)------>Hydrogen chloride(g)
Ans: H2+cl2----->2Hcl (Combination reaction)
Ques 3: Differentiate between exothermic and endothermic reaction?
Ans 3: EXOTHERMIC REACTION: The chemical reaction in which product is formed by the evolution of heat .EX: Cao(s)+H2O(l)---->Ca(oH)2(aq)+Heat
ENDOTHERMIC REACTION: The chemical reaction in which the product is formed by the absorption of heat.EX:C(s)+H2O----->Co(g)+H2-Heat
Ques 4:A solution of substance"x" is used for white washing:
1. Name the substance x and write its formula?
Ans Calcium Oxide (Cao) is the substance x.
2. Write the reaction of the substance named in above with water?
Ans Cao+H2o----->Ca(oH)2(slaked lime)
Ques 5: Explai the following with example:
Ans 5: DOUBLE DISPLACEMENT REACTION: The such reactions in which two compounds react by an exchange of ions to form new compound are called double dispacement reaction. Ex: Na2So4(aq)+Bacl2(aq)------->2Nacl(aq)+BaSo4(s)
NEUTRALIZATION REACTION: Such reactions in which acid is reacted with base to form salt and water. Ex: Hcl+NaoH+Nacl+H2o
DISPLACEMENT REACTION: Those reactions in which more active element displaces or remove a less active element from its compound. Ex: Zn(s)+CuSo4----->ZnSo4+Cu
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