Tag: group 2

Questions Related to group 2

Which element is most alkaline :

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

  1. F

  2. CI

  3. Br

  4. I

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Correct Option: A

Which of the alkaline earth elements forms covalent bonds ? 

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

  1. Ca

  2. Mg

  3. Sr

  4. Be

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Correct Option: D

Estimation of calcium and magnesium is done by :

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

  1. EDTA.

  2. oxalate.

  3. phosphate.

  4. None of these.

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Correct Option: A
Explanation:

Estimation of calcium and magnesium is done by EDTA in complexometric titration. Hexadentate ligand EDTA (ethylene diammine tetra acetate) forms metal chelates with calcium and magnesium. 

Lightest alkaline earth metal is :

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

  1. Be

  2. Mg

  3. Ca

  4. Sr

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Correct Option: A
Explanation:

Beryllium (Be), is the lightest alkaline earth metal with atomic number 4 and mass number 9.

Flame test is not given by :

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

  1. Ca

  2. Ba

  3. Be

  4. Li

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Correct Option: C
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.

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

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

  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

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Correct Option: A
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.

Alkaline earth metal salt are :

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

  1. paramagnetic

  2. diamagnetic

  3. ferromagnetic

  4. all of these

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Correct Option: B
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

Select the correct statement(s) about barium :

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

  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.

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Correct Option: B,C,D
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.

The most lightest alkaline earth metal is:

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

  1. $Be$

  2. $Mg$

  3. $Ca$

  4. $Ba$

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Correct Option: C
Explanation:

Calcium $(Z=20),$ is the lightest alkaline earth metal, with a density of $1.55 g/cm^3$, lighter than both beryllium and magnesium.

Which of the following has highest melting point?

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

  1. Magnesium

  2. Barium

  3. Calcium

  4. Beryllium

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Correct Option: D
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.