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

Calcium Suphate can be produced by :

  1. ${ZnSO} _{4}$ ${+}$ ${CaO}$
  2. $FeSO _4 + CaO + H _2O$
  3. $MgSO _4 + CaSO _4$

  4. Both A and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gypsum or Calcium sulphate can be produced from Zinc Sulphate by reacting Zinc Sulphate with Calcium Oxide or lime. We get a precipitate of Calcium Sulphate. The reaction can be written as-
${ZnSO} _{4}$ ${+}$ ${CaO}$ ${=}$ ${CaSO} _{4}$ ${+}$ ${ZnO}$

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

What is the chemical formula of Epsom Salt?

  1. ${MgSO} _{4}$${.}$${2H} _{2}{O}$
  2. ${MgSO} _{4}$${.}$${5H} _{2}{O}$
  3. ${MgSO} _{4}$${.}$${7H} _{2}{O}$
  4. ${MgSO} _{4}$${.}$${9H} _{2}{O}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The chemical formula of Epsom Salt is ${MgSO} _{4}$${.}$${7H} _{2}{O}$. Or it is also known as Magnesium Sulphate heptahydrate.

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

How is Magnesium sulphate produced from Magnesium?

  1. $Mg$ $+$ $H _2SO _4$
  2. $Mg$ $+$ $SO _2$
  3. $Mg$ $+$ $SO _3$
  4. $Mg$ $+$ $H _2SO _3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When $Mg$ is dissolved in dilute Sulphuric acid, an aqueous solution of Magnesium Sulphate is obtained. The reaction can be represented as-
$Mg$ $+$ $H _2SO _4$ $=$ $MgSO _4$ $+$ $H _2$
This colourless aqueous solution when evaporates, colorless crystals of $MgSO _4.7H _2O$ are formed.

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

What happens when Epsom salt is heated?

  1. $MgSO _4.H _2O$
  2. $MgSO _4$
  3. $MgO$
  4. $SO _3$
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation

When Epsom salt is heated, all the above mentioned products are obtained. When it is heated at $150^o$ C, $MgSO _4.H _2O$ is obtained. When this is further heated at $200^o$ C, $MgSO _4$ is obtained. On further heating $MgO$ and $SO _3$ are obtained.
$MgSO _4.7H _2O$ $+$ $(heat)$ $=$ $MgSO _4.H _2O$  
$MgSO _4.H _2O$ $+$ $(heat)$ $=$ $MgSO _4$
$MgSO _4$ $+$ $(heat)$ $=$ $MgO$ $+$ $SO _3$

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

What is/are the uses of Epsom salt?

  1. Pharmaceutical use

  2. Agricultural use

  3. used as a brewing salt

  4. Used as a desiccant
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation

Epsom salt – actually magnesium sulfate – helps seeds germinate, makes plants grow bushier, produces more flowers, increases chlorophyll production and deters pests, such as slugs and voles. It also provides vital nutrients to supplement your regular fertilizer.

Epsom salt is a popular remedy for many ailments.

People use it to ease health problems, such as muscle soreness and stress. It's also affordable, easy to use, and harmless when used appropriately

Epsom is used to add sulfate and magnesium ions to brewing water.

Drie-Rite is a brand of Anhydrous Calcium Sulfate commonly used as a Desiccant.

Epsom salt has all the above mentioned uses.

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

What are the water molecules attached to Epsom salt called?

  1. Water of evaporation

  2. Water of condensation

  3. Water of hydration

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

The seven molecules of water attached to $MgSO _4.7H _2O$ are known as water of hydration. By definition, it is the amount of water attached to a compound to form a hydrate. Epsom salt is also known as Magnesium sulphate heptahydrate.

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

How does Magnesium Oxide give Magnesium Sulphate?

  1. $MgO$ $+$ $H _2SO _3$
  2. $MgO$ $+$ $H _2SO _4$
  3. $MgO$ $+$ $SO _2$
  4. $MgO$ $+$ $SO _3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When magnesium oxide is dissolved in dilute sulphuric acid, it forms colorless aqueous solution of Magnesium Sulphate. The balanced equation can be written as-
$MgO$ $+$ $H _2SO _4$ $=$ $MgSO _4$ $+$ $H _2O$
This aqueous solution when evaporates and crystallizes, colorless crystals of Epsom salt are obtained.

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

Formation of super phosphate is:

  1. exothermic reaction

  2. endothermic reaction

  3. reversible reaction

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A well powdered phosphate rock or bone ash mixed known quantity of concentrate sulphuric acid is introduced into a cast iron chamber provided with mechanical stirrer and two valves at bottom. Each valve opens in a big chamber called den. The mixture is stirred for 2 to 5 minutes and then dumped mechanically into one of the dens through the valve. The mass is kept in the den for about 24 hours.

${ Ca } _{ 3 }{ \left( P{ O } _{ 4 } \right)  } _{ 2 }+2{ H } _{ 2 }S{ O } _{ 4 }+4{ H } _{ 2 }O\longrightarrow Ca{ ({ H } _{ 2 }P{ O } _{ 4 }) } _{ 2 }+2CaS{ O } _{ 4 }.2{ H } _{ 2 }O+Heat$

A mixture of calcium sulphate and calcium dihydrogen phosphate is obtained .This mixture is called superphosphate.