A number of elements are available in earth’s crust but most abundantly available elements are ____.

Q. A number of elements available in earth's crust but most abundant elements are:

Q.

A number of elements are available in earth’s crust but most abundant elements are ____________.

Q. Which of the following is the correct conclusion. Also, give the reason?

Observation	I	II	III
Solution after reaction	Colourless	Colourless	Colourless
Metal Deposited	Zn	Cu	Fe

(a) Al is more reactive than Cu and Fe but less reactive than Zn
(b) Al is more reactive than Cu but less reactive than Zn and Fe
(c) Al is more reactive than Zn and Cu but less reactive than Fe
(d) Al is more reactive than Zn, Cu, Fe.

Q. How many of the following elements can react with dilute sulphuric acid?

Na, Al, K, Au, Fe, Ag, Cu

Q. If a metal X displaces Fe, Zn and Cu but not Al, then which of these can displace X?