Q. 364.4( 13 Votes )
What is meant by
(a) displacement reaction, and
(b) double displacement reaction? Explain with the help of one example each.
Ex- CuSO4 (aq.) + Zn (s) → ZnSO4 + Cu
When zinc is added to copper sulphate solution, then zinc displaces copper from its aqueous solution forming Zinc sulphate(aq.) and Copper metal. Here, copper is displaced by Zinc from its compound.
(b) The reation in which two compound react by an exchange of ions to form two new compounds are called double displacement reactions.
Ex- AgNO3 (aq.) + NaCl (aq.) → AgCl (s)+ NaNO3 (aq.)
Here, Silver and sodium displaces each other from their aqueous solution to form Silver chloride(solid) and Sodium nitrate (aqueous).
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Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to:
(i) The formation of silver by decomposition of silver chloride
(ii) Sublimation of silver chloride
(iii) Decomposition of chlorine gas from silver chloride
(iv) Oxidation of silver chlorideEvergreen Science
Which of the following are exothermic processes?
(i) Reaction of water with quicklime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)Evergreen Science
(b)Lakhmir Singh & Manjit Kaur - Chemistry