Question

You are having five solution A, B, C, D and E with pH values as follows

A = 1.8, B - 7, C = 8.5, D = 8 and E = 5

Which solution would be most likely to liberate hydrogen with magne-

sium powder ? [ ]

a) Solution S and B b) Solution A

c) Solution C d) All of the above​

Answer 1

answer is b) Solution A

when magnesium powder reacts with HCL, it forms magnesium chloride and liberate hydrogen gas

The reaction that takes place is:

Mg + 2 HCl= Mgcl2 and H2

as we know that HCL is a strong acidic solution.The pH of acidic solution is less than 7 .

Being a strong acid , the pH of HCL is 1.8