MOCK TEST

Which of the cations ${\mathrm{Mg}}^{2+}$ and ${\mathrm{Al}}^{3+}$ is smaller? Give reason.

The formula of the sulphate of the element ($\mathrm{X}$) with atomic number $13$ is ${\mathrm{X}}_2{\left({\mathrm{SO}}_4\right)}_{\mathrm{m}}$. What is the value of m?

Name the element which requires the highest amount of energy to lose an electron.

Which of the following is amphoteric in nature?

A. ${\mathrm{Na}}_2\mathrm{O}$

B. ${\mathrm{Al}}_2{\mathrm{O}}_3$

C. ${\mathrm{SO}}_2$

"Enter your correct answer as A, B or C."

What is the usual number of valence electrons and valency of group 18 elements of the periodic table?

Which has a bigger size, argon or chlorine. Explain why?

Explain the following: Beryllium oxide is amphoteric while magnesium oxide is basic.

Explain the following: Carbon is a non-metal while silicon is a metalloid.