Periodic Trends in the Properties of Elements

The correct order of $1^{\mathrm{st}}$ ionisation enthalpy among the following elements $\mathrm{Be}, \mathrm{B}, \mathrm{C}, \mathrm{N}, \mathrm{O}$ is

Amongst the following, the most basic oxides are

The formation of the oxide ion ${\mathrm{O}}^{2-}$(g) requires first an exothermic and then an endothermic step as shown below: $\mathrm{O}\left(\mathrm{g}\right)+{\mathrm{e}}^{-1}\to {\mathrm{O}}^{-}\left(\mathrm{g}\right);∆{\mathrm{H}}^0=-142 \mathrm{k}\mathrm{J} \mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$
${\mathrm{O}}^{-}\left(\mathrm{g}\right)+{\mathrm{e}}^{-1}\to {\mathrm{O}}^{2-}\left(\mathrm{g}\right);∆{\mathrm{H}}^0=+844 \mathrm{k}\mathrm{J} \mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$
This is because

The correct order of $1^{\mathrm{st}}$ ionisation enthalpy among the following elements $\mathrm{Be}, \mathrm{B}, \mathrm{C}, \mathrm{N}, \mathrm{O}$ is

Which of the following pair is amphoteric oxides?

Incorrect statement about the element, If the element has atomic mass 40 and electronic configuration is 2, 8, 8, 2.

Among the following oxides how many of them are suboxides?

${\mathrm{C}}_3{\mathrm{O}}_2, {\mathrm{N}}_2\mathrm{O}, {\mathrm{NO}}_2, \mathrm{CO}, {\mathrm{Fe}}_3{\mathrm{O}}_4, {\mathrm{KO}}_2$

What is the electron affinity order of group $13 \mathrm{to} 18$ elements?

(X), (Y), (Z) are elements of the third period. Oxide of (X) is ionic, that of (Y) is amphoteric and oxide of (Z) is a giant molecule. (X), (Y) and (Z) will have atomic numbers in the order

Which of following is amphoteric in nature.

Correct sequence of acidic character is:

Which of the following metallic oxides exhibit amphoteric nature?

Which one of the following is a covalent hydride?

The increasing order of acidic nature of $\mathrm{N}{\mathrm{a}}_2\mathrm{O},\mathrm{ }\mathrm{B}\mathrm{e}\mathrm{O},\mathrm{ }{\mathrm{B}}_2{\mathrm{O}}_3,\mathrm{ }\mathrm{C}\mathrm{a}\mathrm{O}$ .

Among $A{l}_2{O}_3, Si{O}_2, P_2{O}_3 and S{O}_2$ the correct order of acidic strength is

Elements of which of the following group (s) of periodic table do not form hydrides.

The basic and amphoteric oxides of transition metals are

The order of basic character of given oxides is

An element of atomic mass 40 has 2, 8, 8, 2 as the electronic configuration. Which among the following statements regarding this element is not correct?

Which is correct order of basic nature of oxides -