Explain the classification based on the direction of the reaction.

1.	Explain the classification based on the direction of the reaction.
Answer» Solution :Reversiblereactions : (i)A reversiblereactionis a reactionthatcanbe REVERSED . (ii )The productscan beconvertedbackthat canreactants . (III )A reversiblereaction is representedbya doublearrowwiththeirheads in thedirectionoppositeto eachother . (iv )The compound`'Ab'` undergoesdecomposition to formthe products'A' and'B'. (v )it istheforwardreaction. (vi)As soonas theproductsare formed, theycombinetogther totoform 'AB' . It is thebackwardreaction . E.g `PCI_(5(g))hArrPCI_(3(g)) +Cl_(2(g))` Irreversiblereactions : (i)the reactionthatcannotbe reversediscalledirreversiblereaction . (ii)E.gCombustionof coalintocarbondioxideand water. `underset("Coal ") underset("Oxygen ")O_(2(g)) tounderset("Carbondioxide")CO_(2(g))+`Heat (iii) Solidcoalburns - withoxygenand getsconverted intocarbondioxidegasand water. (iv )As soonasthegasesformed, ESCAPES outofthe reactioncontainer . (v)It ishardto decomposea gasintoa solid . (vi )THus, thebackward reactionis notposibleinthiscase, soit isan irrversiblereaction .

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