List of top Chemistry Questions on Classification

Which one of the following is the smallest in size?

The first ionisation potential of Na, Mg, Al and Si are in the

Atomic radii of fluorine and neon in Angstrom units are respectively given by

The correct order of second ionisation potential of carbon, nitrogen, oxygen and fluorine is

An atom with high electronegativity has

Which among the following statements are correct? (i) Carbon monoxide is neutral whereas $ S0_3 $ is acidic (ii) Potassium oxide is basic whereas nitrous oxide is acidic (iii) Aluminium and zinc oxides are amphoteric (iv) Sulphur trioxide is acidic whereas phosphorus pentoxide is basic (v) Carbon dioxide is netural whereas sulphur dioxide is amphoteric

An element 'X' belongs to fourth period and fifteenth group of the Periodic Table. Which one of the following is true ?

The element with atomic number 117 has not been discovered yet. In which family would you place this element if discovered?

Which of the following pairs contain metalloid elements in the periodic table?

Species Plantarum and Systema Naturae were written by

Which one of the following is an example of $ 3^{\circ} $ amide?

The plant groups proposed by Aristotle in his classification were

The electronic configuration of four elements are 1. $ [ Xe ] 6x^1$ 2. $ [ Xe ] 4 f^{ 14} \, 5d^1 \, 6s^2 $ 3. $ [ A r ] 4s^2 \, 4p^5 $ 4. $ [ A r ] 3d^7 \, 4s^2 $ Which one of the following statements about these elements is not correct?