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 statements regarding alkaline earth metals is/are incorrect?

  1. All alkaline earth metal oxides are basic.
  2. All alkaline earth metal hydrides are ionic.
  3. Stability of peroxides of alkaline earth metals increases down the group.
  4. The thermal stability of alkaline earth metal hydroxides increases down the group.

  1. 1 and 2

  2. 1 and 4

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Except BeO, which is amphoteric, all alkali metal and alkaline earth metal oxides are basic.

Multiple choice

Which of the following terms statements are TRUE? P. All alkali metal elements form solid hydrogen carbonates. Q. Calcium is fifth most abundant element in the earth’s crust. R. Francium is highly radioactive. S. Hydration enthalpies of alkaline earth metal ions are larger than those of alkali metal ions.

  1. P and Q

  2. P and S

  3. Q and R

  4. Q and S

  5. R and S
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Francium is highly radioactive; its longest-lived isotope 223-Fr has a half-life of only 21 minutes. The hydration enthalpies of alkaline earth metal ions are larger than those of alkali metal ions. Thus, compounds of alkaline earth metals are more extensively hydrated than those of alkali metals, e.g., MgCl2 and CaCl2 exist as MgCl2.6H2O and CaCl2.6H2O while NaCl and KCl do not form such hydrates.

Multiple choice

Which of the following statement are true?

  1. Melting points of alkaline earth metals are greater than those of alkali metals.
  2. All alkali metal carbonates are stable at a temperature around 800oC.
  3. Carbonates of alkali metals are more stable to heat than carbonates of alkaline earth metals.

  1. Only 1

  2. Only 2

  3. 3 only

  4. Both 1 and 2

  5. Both 2 and 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Melting points of alkaline earth metals are greater than those of alkali metals. Reason: 1. The atoms of alkaline earth metals have two delocalized electrons and their sizes are smaller than those of alkali metals.

  1. Alkaline earth metals have closed-packed structure while alkali metals have open structure (body-centered cubic).
Multiple choice

The existence of which of the following became the reason for the failure of Mendeleev's periodic law?

  1. Alkali metals

  2. Alkaline earth metals

  3. Halogens

  4. Isotopes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Since Mendeleev’s periodic law was based on atomic masses of the elements, the isotopes should have been  placed in different slots despite the fact that they represent the same element. This was one of the major disadvantage of Mendeleev’s periodic law.

Multiple choice

Characteristic property of alkali metals is

  1. they are good reducing agents

  2. they are good oxidising agent

  3. electropositive character decreases down the group

  4. high ionisation potential
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Due to low ionisation potential they readily give electrons for reduction. Hence they act as reducing agents