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

In paper industry, the chemical compound used for bleaching is :

  1. potassium sulphite

  2. calcium sulphate

  3. sulphuric acid

  4. calcium bisulfite
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A bleaching agent is a material that lightens or whitens a substrate through chemical reaction. The bleaching reactions usually involve oxidative or reductive processes that degrade color systems In paper industry, the chemical compound used for bleaching is calcium bisulphate. 

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

How can Calcium Sulphate be produced from $Ca _3(PO _4) _2$ ?

  1. Reacting with Sulphuric acid

  2. Reacting with Sulphur

  3. Reacting with Sulphur trioxide

  4. Reacting with Sulphur dioxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When Calcium Phosphate is treated with Sulphuric Acid, Calcium Sulphate is obtained as a precipitate along with the formation of Phosphoric Acid. The balanced equation can be written as-
$Ca _3(PO _4) _2$ $+$ $3H _2SO _4$ $=$ $2H _3PO _4$ $+$ $3CaSO _4$

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

How is ${MgSO} _{4}$ produced from ${MgCO} _{3}$?

  1. ${MgCO} _{3}$${+}$ ${S}$
  2. ${MgCO} _{3}$${+}$ ${SO} _{2}$
  3. ${MgCO} _{3}$${+}$ ${SO} _{3}$
  4. ${MgCO} _{3}$ ${+}$ ${H} _{2}{SO} _{4}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Magnesium Sulphate is produced from Magnesium carbonate by reacting the carbonate with Sulphuric acid. The balanced equation can be written as-
${MgCO} _{3}$${+}$ ${H} _{2}{SO} _{4}$  ${=}$ ${MgSO} _{4}$ ${+}$ ${CO} _{2}$ ${+}$ ${H} _{2}{O}$

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

What is the chemical formula of Gypsum?

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

The chemical formula of Gypsum is ${CaSO} _{4}$${.}$${2H} _{2}{O}$. It contains two moles of water in it. It can also be said as Calcium Sulphate dihydrate.

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.