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Q3 of 805 Page 180

Which one of the following four metals would be displaced from the solution of its salt by other three metals?

Reactivity order of the above four elements


Mg > Zn > Cu > Ag


As Silver(Ag) is the least reactive element amongst the above four mentioned element. So, Mg, Zn and Cu displace Ag from solution of its salt.

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1

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Which among the following is (are) true about slaking of lime?

(i) It is an endothermic reaction


(ii) It is an exothermic reaction


(iii) The pH of the resulting solution will be more than seven


(iv) The pH of the resulting solution will be less than seven

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