Chemistry · Science General

Periodic Table and Elements

406 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 chemistry group 2 physical properties of alkaline earth metals alkali metals properties of alkaline earth metals

In which case second has lower boiling point than first?

  1. Li, K

  2. Be, Mg

  3. Li, Cs

  4. Ca, Mg
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation

(A) The boiling point of K is $1032$ K which is lower than that of Li ($1615$ K)
(B) The boiling point of Mg is $1363$ K which is lower than that of Be ( $2745$ K).
(C) The boiling point of Cs is $944$ K which is lower than that of Li ($1615$ K).
(D) The boiling point of Mg is $1363$ K is which is lower than that of Ca ($1767$ K).
Hence, all are correct.

Multiple choice chemistry group 2 physical properties of alkaline earth metals alkali metals properties of alkaline earth metals

The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because:

  1. there is increase in the nuclear charge of the alkaline earth metal

  2. there is decrease in the nuclear charge of the alkaline earth metal

  3. there is no change in the nuclear charge

  4. none ofthe above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As the nuclear charge increases it requires more energy to remove electron(Ionization energy) hence ionization energy will be increased. The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because of the increase in the nuclear charge of the alkaline earth metal.

Multiple choice chemistry group 2 physical properties of alkaline earth metals alkali metals properties of alkaline earth metals

Alkaline earth metal salt are :

  1. paramagnetic

  2. diamagnetic

  3. ferromagnetic

  4. all of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Alkali earth metals are diamagnetic.

Atoms or elements which are having even number of electrons or  no unpaired electrons are diamagnetic.

Alkaline earth metals are having even number of electrons(Be,Mg,Ca,Sr,Ba,Ra having electrons 4,12,20,38,56 and 88 respectively which are even in number)

Hence option B is correct

Multiple choice chemistry group 2 physical properties of alkaline earth metals alkali metals properties of alkaline earth metals

Select the correct statement(s) about barium :

  1. It shows photoelectric effect.

  2. It is silvery white metal.
  3. It forms $Ba(N _3) _2$ which is used in preparation of green fire.

  4. Its ionization energy is less than radium.
Reveal answer Fill a bubble to check yourself
B,C,D Correct answer
Explanation

A) It shows photoelectric effect.False,becuase it has completely filled s orbital so removal of electron is difficult.

B) It is silvery white metal.True.

C) It forms $Ba(N _3) _2$ which is used in preparation of green fire.True.

D) Its ionization energy is less than radium True.

Hence options B,C & D are correct.

Multiple choice chemistry group 2 physical properties of alkaline earth metals alkali metals properties of alkaline earth metals

Which of the following has highest melting point?

  1. Magnesium

  2. Barium

  3. Calcium

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

Beryllium has highest melting point (1560 K).
In fact, the melting point, the boiling point and the ionisation enthalpy of beryllium are highest of all the alkaline earth metals. This is due to small atomic size of beryllium.

Multiple choice chemistry group 2 physical properties of alkaline earth metals alkali metals properties of alkaline earth metals

Select the incorrect choice: 

  1. the solubility of alkaline earth metal's carbonates, sulphates and chromates decreases Be to Be.

  2. the solubility of alkaline earth metal's hydroxides is less than alkali metal hydroxides.

  3. solubility of alkaline earth metal's oxides increases from Be to Ba.
  4. $SO _2$ on passing in lime water turns is milky.
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice chemistry lattice energy defining lattice energy ionic or electrovalent bond energy cycles

Which pair is not correct order of lattice energy?

  1. $KCI > MgO$
  2. $AlN > MgO$
  3. $BeCO _3 > MgCO _3$
  4. $KCI < MgO$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lattice Energy is directly proportional to the charge on the ions and inversely proportional the size of the ions. As size decreases, lattice energy increases. So $MgO$ have higher lattice energy than $KCl$.

Multiple choice chemistry lattice energy defining lattice energy ionic or electrovalent bond energy cycles

Which of the following has higher lattice energy -$Al _2O _3$ or $Al _2Se _3$?

  1. $Al _2O _3$ > $Al _2Se _3$
  2. $Al _2O _3$ < $Al _2Se _3$
  3. $Al _2O _3$ = $Al _2Se _3$

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lattice Energy is directly proportional to the charge on the ions and inversely proportional to the size of the ions. The two species have the same charge but the size of $Se$ is greater than $O$. Hence lattoce energy of $Al _2O _3$ is greater than $Al _3Se _3$.