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 correct about ionisation potential?

  1. It is independent of atomic radii.

  2. It increases with increase in atomic radii.

  3. It remains constant with increase in atomic radii.

  4. It decreases with increase in atomic radii.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As the atomic radius increases, effective nuclear charge decreases and hence ionisation potential also decreases.

Multiple choice

Pick out the statement(s) which is/are not true about the diagonal relationship of Li and Mg.

(i) Polarising powers of Li+ and Mg2+ are almost the same. (ii) Both Li and Mg decompose water very quickly. (iii) LiCl and MgCl2 are deliquescent. (iv) Like Li, Mg does not form solid bicarbonates.

  1. (i) and (ii)

  2. (ii) and (iii)

  3. Only (ii)

  4. Only (i)

  5. Only (iii)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lithium and magnesium show diagnol relationship. Some points of similarity are as follows: (i) Polarising power of Li+ and Mg+ are almost the same. (ii) Like Li, Mg decomposes water very slowly. (iii) LiCl and MgCl2 are deliquescent. (iv) Like Li, Mg does not form solid bicarbonates.

Multiple choice

Of the following which has the smallest radius?

  1. Cs+

  2. Mg2+

  3. Na+

  4. Li+
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Li and Mg are elements showing diagonal relationship. Hence. they have almost same atomic radius. Mg is smaller than Na. Size of Mg2+ is much lesser than Mg atom. Hence the alternative to be chosen is 2

Multiple choice

The ionisation energy will be maximum for the process

  1. Ba →Ba++

  2. Be→ Be++

  3. Cs →Cs+

  4. Li →Li+
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ionisation energy increases from left to right along a period and decreases from top to bottom along a group. Further, ionisation energy of an element with half filled or completely filled orbitals is higher, The second ionization energy is always more than the first ionisation energy. Considering all these points we can conclude that ionization energy of Be2+ is the maximum

Multiple choice

Cesium is the most reactive alkali metal because

  1. its incomplete shell is nearest to the nucleus

  2. it has a single electron in its valence shell

  3. it is the heaviest alkali metal

  4. its outermost electron is more loosely bound than the outermost electron of the other alkali metals
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Because of its large size, the outermost electron of cesium is more loosely bound to the nucleus of the atom. Hence, it can be easily removed.