Which of the following metals does not react with a solution of copper sulphate?

Which pair of elements with the given atomic numbers is expected to have similar properties?

The electronic configuration of three elements $A, B$ and $C$ are given below. The molecular formula of the compound formed from $B$ and $C$ will be
$A : 1s^2, 2s^2, 2p^6$
$B : 1s^2, 2s^2, 2p^6, 3s^2, 3p^3$
$C : 1s^2, 2s^2, 2p^6, 3s^2, 3p^5$

Among the oxides $SiO_2, SO_2, Al_2O_3$ and $P_2O_3$,the correct order of acidic strength is

Explain the trends in physical and chemical reactivity of elements across a period and down a group.

Which of the following is $Not$ predominantly acidic or amphoteric oxide?