Question

when same amount of zinc is treated separately with excess of suphuric acid and excess of sodium hydroxide solution, the ratio of volumes of hydrogen evolved is?
(a)1:1
(b)1:2
(c)2:1
(d)9:4

Answer 1

Hey...

The answer is a)1:1

Answer 2

Zn + H2SO4 ------ >  ZnSO4 + H2 (g)   ----------- (1)

Zn + 2NaOH + 2H2O ------ >  Na2ZnO2+ H2 (g)    ------------- (2)


From the above equations, we can see that ratio of H2 evolved = 1/1

                                                                                                            = 1 : 1


So Option (a) is the correct answer.


Hope this helps!