Tag: group 2

Questions Related to group 2

Select the incorrect choice: 

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

  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.

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Correct Option: A

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?

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

  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

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Correct Option: D
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.

Which of the following metal sulphide is water soluble?

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

  1. $CaS$

  2. $ZnS$

  3. $HgS$

  4. $CdS$

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Correct Option: A
Explanation:

Calcium sulphide, $CaS$ and zinc sulphide $ZnS$ are slightly soluble in water.
Cadmium sulphide $CdS$ and mercury (II) sulfide are insoluble in water.

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

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

  1. $MgSO _4$

  2. $CaCl _2$

  3. $Sr(NO _3) _2$

  4. $BeCl _2$

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Correct Option: A,D
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

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

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

  1. $Be < Ca < Mg < Sr$

  2. $Be < Mg < Sr < Ca$

  3. $Be < Mg < Ca < Sr$

  4. $Ca < Sr < Be < Mg$

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Correct Option: C
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.

Select the correct statements :

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

  1. Solubility of alkali earth metal's oxide decreases down the group

  2. Solubility of alkaline earth metal's sulphide increases down the group

  3. Solubility of alkali metal's hydroxide increases down the group

  4. Solubility of alkali metal's fluorides increases down the group

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Correct Option: B,C,D

Select the correct order of density.

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

  1. Na > K

  2. Na < K

  3. Mg > Ca

  4. Mg < Ca

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Correct Option: A,C
Explanation:

The trend of density amongst alkali metals: $Li<K<Na<Rb<Cs$


The trend of density amongst alkaline earth metals: $Ca<Mg<Be<Sr<Ba<Ra$

Hence the correct choices are $Na>K$ and $Mg>Ca$