Tag: some important compounds of magnesium and calcium

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Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

Magnesium oxide is produced by the calcination of magnesium phosphate or magnesium sulphate by the treating magnesium chloride with lime followed by heat.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It is produced by the calcination of magnesium carbonate or magnesium hydroxide.The latter is obtained by the treatment of magnesium chloride solutions, typically seawater, with lime.

Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

How can Calcium Suphate be produced from Calcium Fluoride?

  1. ${CaF} _{2}$ ${+}$ ${H} _{2}{SO} _{4}$
  2. ${CaF} _{2}$ ${+}$ ${SO} _{2}$
  3. $CaF _2 + H _2S$

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

Calcium Fluoride is treated with Sulphuric Acid to give Hydrogen Fluoride and a precipitate of Calcium Sulphate. The balanced equation can be written as-
${CaF} _{2}$ ${+}$ ${H} _{2}{SO} _{4}$ ${=}$ ${2HF}$ ${+}$ ${CaSO} _{4}$

Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

Which of the following statement about magnesium oxide is/are correct?

  1. It is a relatively poor desiccant

  2. The largest consumer of magnesia is refractory industry

  3. It is used for making Portland cement

  4. In medicine, magnesium oxide is used for relief of heartburn and sour stomatch
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation

Magnesium oxide is used in all these applications: it acts as a mild desiccant, is a primary material in the refractory industry, is a component in cement, and is used as an antacid.

Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

Magnesium on heating in air gives $(A)$ and $(B)$. On reaction with water $(B)$ gives colourless gas $(C)$. $(C)$ when passed through $CuSO _4$ solution gives a blue coloured solution $(D)$. The blue solution is:

  1. $MgO$
  2. $Mg _3N _2SO _3.H _2O$
  3. $NH _3$
  4. $[Cu(NH _3) _4]SO _4.H _2O$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Option $(D)$ is correct.

Magnesium on strong heating reacts with nitrogen of air.
$Mg + O _2 \rightarrow MgO  [A] + Mg _3N _2 [B]$
$Mg _3N _2 [B]  + H _2O \rightarrow Mg(OH) _2 + NH _3 [C]$
$ NH _3 + CuSO _4(aq) \rightarrow [Cu(NH _3) _4]SO _4.H _2O [D]$

Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

$MgO$ when mixed with a saturated solution of $MgCl _2$ sets to a hard mass known as 'sorel cement'. The composition of sorel cement is $MgCl _2.nMgO.xH _2O$. The value of $n$ is:

  1. 2

  2. 5

  3. 3

  4. 1
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

There are two types of sorel cement 3 phase and 5 phase.

$MgCl _2.3Mg(OH) _2.8H _2O$ is 3 phase sorel cement.