5g of zinc is treated separately with an excess of a) dilute hydrochloric acid and b) aqueous sodium hydroxideThe ratio of the volumes of H2 evolved in these two reactions is

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1 : 1

1 : 2

2 : 1

1 : 4

answer is A.

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Detailed Solution

zn+2HCl⇒ZnCl2+H2↑ zn+2NaOH⇒Na2ZnO2+H21 Mole of ‘Zn” reacts with equal moles of HCl, NaOH separately.No of ratio of H2=1:1

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