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Attempt either (a) or (b) :
(a) Give reasons :
(i) For dilution of an acid, acid is added into water and not water into acid.
(ii) Dry $\ce{HCl}$ gas does not turn blue litmus red whereas dilute $\ce{hydrochloric}$ $\ce{acid}$ does.
(iii) Blue colour of $\ce{Copper(II)}$ $\ce{sulphate}$ crystals turns white on heating.
(a) Give reasons :
(i) For dilution of an acid, acid is added into water and not water into acid.
(ii) Dry $\ce{HCl}$ gas does not turn blue litmus red whereas dilute $\ce{hydrochloric}$ $\ce{acid}$ does.
(iii) Blue colour of $\ce{Copper(II)}$ $\ce{sulphate}$ crystals turns white on heating.
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(a) (i) When acid is added to water, it does not cause excessive local heating/ does not splash out and cause burns.
(1)
(ii) Because dry $\ce{HCl}$ does not ionize/produce $\ce{H+}$ ions whereas in dilute $\ce{HCl}$, $\ce{H+}$ ions are present.
(1)
(iii) Because of loss of 5 molecules of water of crystallisation.
(1)
(1)
(ii) Because dry $\ce{HCl}$ does not ionize/produce $\ce{H+}$ ions whereas in dilute $\ce{HCl}$, $\ce{H+}$ ions are present.
(1)
(iii) Because of loss of 5 molecules of water of crystallisation.
(1)