Which of the following elements does not lose an electron easily?

Define alloys. List the properties of alloys that make them useful over pure metals. Explain this fact with suitable examples.

Name two metals which will displace hydrogen from dilute acids,and two metals which will not.

Which gas is produced when a base reacts with a metal?

What is thermit reaction? How is it used to join the railway tracks or cracked machine parts?

Study the reactions given below. State which of the following chemical reactions will take place or not,giving suitable reason for each:
$(a)$ $Zn(s) + CuSO_4(aq) \rightarrow ZnSO_4(aq) + Cu(s)$
$(b)$ $Fe(s) + ZnSO_4(aq) \rightarrow FeSO_4(aq) + Zn(s)$
$(c)$ $Zn(s) + FeSO_4(aq) \rightarrow ZnSO_4(aq) + Fe(s)$