Tag: properties of alkaline earth metals

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

Dehydration of hydrates of halides of calcium, barium and strontium i.e., $CaCl _2.6H _2O,BaCl _2.2H _2O,SrCl _2.2H _2O$ can be achieved by heating. These become wet on keeping in the air. Which of the following statements is correct about these halides?

  1. The act as dehydrating agents.

  2. They can absorb moisture from air.

  3. They have tendency to from hydrate which decreases from calcium to barium.

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Halides of calcium, barium and strontium act as dehydrating agent as they are hygroscopic in nature. They absorb moisture. Also they have tendency to form hydrate which decreases from $Ca^{2+}$ to $Sr^{2+}$ due to increase in size and decrease in polarization power.

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

Which of the following does/do not impact characteristic colour to the flame?

  1. $MgSO _4$
  2. $CaCl _2$
  3. $Sr(NO _3) _2$
  4. $BeCl _2$
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation

$CaCl _2$ has orange colour.
$Sr(NO _3) _2$ has crimson colour flame.


Be and Mg do not impart any colour to the flame due to higher ionization energy and small size.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

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

The correct increasing order of basic nature among Be, Mg, Ca and Sr is :

  1. $Be < Ca < Mg < Sr$
  2. $Be < Mg < Sr < Ca$
  3. $Be < Mg < Ca < Sr$
  4. $Ca < Sr < Be < Mg$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The correct increasing order of basic nature among Be, Mg, Ca and Sr is $Be < Mg < Ca < Sr$.
$Be$ forms amphoteric oxides and hydroxides, whereas other alkaline earth metals form basic oxides and hydroxides. The basicity increases on moving down the group due to increase in the size of the metal ion, decrease in the ionization energy and increase in the electropositive character. This increases the polarity of metal oxygen bond and internuclear distance which in turn increases the ease of formation of ion and the basic character.