Hydrogen from acids cannot be displaced by (A) Li (B) Sr (C) Al (D) Ag

The metal that cannot displace hydrogen from dil. HCl is

Aluminium displaces hydrogen from acids but copper does not. A galvainc cell prepared by combining Cu//Cu^(2+) and Al//Al^(3+) has an emf of 2.0 V at 298 K. If the potential of copper electrode is +0.34 then that of the aluminium electrode is:

Give reason for the following: Dilute sulphuric acid cannot be replaced by concentrated acid in the preparation of hydrogen.

Which metal gives hydrogen with all of the following: water, acids, alkalis ? (A) Fe (B) Zn (C) Mg (D) Pb

Which metal produces hydrogen gas on reaction with cold water? (a) Al (b) Fe (c) Pd (d) Na

Name two metals that can displace hydrogen from dilute acids to form metal salts and hydrogen gas.

Assertion (A) Cu cannot liberate hydrogen from acids. Reason (R ) Because it has positive electrode potential.

Hydrogen is obtained by displacement from: dilute hydrochloric acid Write equations using zinc and Iron.

Hydrogen is obtained by displacement from: dilute sulphuric acid Write equations using zinc.

Arrange the following in increasing order as directed (a) Li^(+), Be^(+), B^(+), C^(+) (Stability) (b) B, Al, Ga, In, Tl (First Ionisation energy)