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Consider following reaction: $Mg(s)+2HCl(aq)\rightarrow H_2(g)+MgCl_2(aq)$.The rate of this reaction increases when more magnesium is added.This change is due to

$\begin{array}{1 1}(a)\;adding\;of\;catalyst\\(b)\;increase\;in\;surface\;area\\(c)\;change\;in\;nature\;of\;reactants\\(d)\;increase\;in\;concentration\;of\;reactants\end{array}$

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Answer: Increase in surface area.
You are only going to get a reaction if the particles in the gas or liquid collide with the particles in the solid. Increasing the surface area of the solid increases the chances of collision taking place.
Increasing the number of collisions per second increases the rate of reaction.
As amount of magnesium is increased surface area increases and hence more useful collisions can take place and hence rate of reaction will increase.
answered Dec 19, 2013 by sreemathi.v
edited Jul 24, 2014 by balaji.thirumalai

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