Tag: group 2

Quizzes (2) Questions (47)

Questions Related to group 2

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

Flame test is not given by :

  1. Ca

  2. Ba

  3. Be

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

Beryllium and magnesium do not give any colour to the flame test because they have a small size and very high ionization enthalpies. The energy of the flame is not sufficient to excite the electrons to higher energy levels. Hence, they do not impart any characteristic colour to the flame.

Hence option B is 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.