Chemistry · Science General

Periodic Table and Elements

421 Questions

The periodic table and elements questions test knowledge of chemical properties, atomic structures, and periodic trends. Topics include alkali metals, transition elements, and ionisation potential. These concepts frequently appear in general science sections of competitive examinations.

Alkali metals propertiesTransition elementsLattice energyIonisation potentialAlkaline earth metals

Periodic Table and Elements Questions

Multiple choice

Which of the following is not true regarding alkaline earth metal carbonates?

  1. Solubility increases with increase in the atomic number of the metal ion.

  2. Decompose on heating to give CO2 and respective oxide.

  3. Berryllium carbonate is unstable.

  4. Thermal stability increases with increase in cationic size.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

this option is correct because actually solubility decreases as the atomic number of the metal ion increases and it becomes less stable with increasing atomic number of the metal ion involved.

Multiple choice

+2 oxidation state is generaly not observed in alkali metals because of

  1. high first ionisation enthalpy.

  2. low first ionisation enthalpy

  3. low second ionisation enthalpy

  4. high second ionisation enthalpy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

this option is correct because in alkali metals when one elctron is detached from the outermost shell then it acquires noble gas configuration resuting in large second ionisation enthalpy and hence it does not show +2 oxidation state.

Multiple choice

Which of the following elements has the smallest size?

  1. C

  2. N

  3. O

  4. S
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Atomic size decreases on moving from lest to right along a row in the periodic table and it increases on moving from top to bottom  in a period.So oxygen has the smallest size of the given options.