Chemistry · Science General

Common Chemical Compounds and Reactions

1,204 Questions

Common chemical compounds and reactions questions test your knowledge of everyday chemicals, their formulas, and their interactions. Topics include properties of acids and bases, hard water chemistry, and compounds like baking soda and plaster of paris. This section is essential for general science preparation.

Acids and basesPlaster of parisHard water chemistryCommon chemical formulasEveryday chemical reactions

Common Chemical Compounds and Reactions Questions

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

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

Super phosphate consist(s) of:

  1. calcium sulphate

  2. calcium hydrogen phosphate

  3. calcium carbonate
  4. both $A$ and $B$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Single superphosphate (SSP) was the first commercial mineral fertilizer, and it led to the development of the modern plant nutrient industry. This material was once the most commonly used fertilizer, but other phosphorus (P) fertilizers have largely replaced SSP because of its relatively low P content.

The general chemical reaction involved in the production of SSP is

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

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

A mixture of single superphosphate and triple superphosphate is called:

  1. mean phosphate

  2. average phosphate

  3. double phosphate

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

A mixture of single superphosphate and triple superphosphate is called double superphosphate. More than 90% of a typical superphosphate fertilizer is water-soluble.

Hence option C is correct.

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

What is the other name for calcium dihydrogen phosphate?

  1. Superphosphate

  2. Calcium phosphorite

  3. Monocalcium phosphate

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

Monocalcium phosphate is an inorganic compound with the chemical formula $Ca{ ({ H } _{ 2 }P{ O } _{ 4 }) } _{ 2 }$. It is commonly found as the monohydrate $Ca{ ({ H } _{ 2 }P{ O } _{ 4 }) } _{ 2 }.{ H } _{ 2 }O$ Both salts are colourless solids. They are used mainly as superphosphate fertilizers.

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

Calcium phosphate used in the manufacturing of superphosphate is available in which form?

  1. Powdered phosphate rock

  2. Bone ash
  3. Both $A$ and $B$

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

As a mineral resource, “phosphate rock” is defined as unprocessed ore and processed concentrates that contain some form of apatite, a group of calcium phosphate minerals that is the primary source for phosphorus in phosphate fertilizers, which are vital to agriculture.

Bone ash is a white material produced by the calcination of bones. Typical bone ash consists of about 55.82% calcium oxide, 42.39% phosphorus pentoxide, and 1.79% water. The exact composition of these compounds varies upon the type of bones being used, but generally the formula for bone ash is: ${ Ca } _{ 5 }(OH){ (P{ O } _{ 4 }) } _{ 3 }$.

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

Which of the following is/are true?

  1. $MgCl _2 \cdot 5 MgO \cdot xH _2O$ is soral magnesia

  2. Soral magnesia is a cement usd in dental filling

  3. Both of the above
  4. $MgCl _2.KCl.8H _2O$ is soral magnesia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$MgCl _2 \cdot 5 MgO \cdot xH _2O$  is soral magnesia.
Soral magnesia is a cement usd in dental filling.

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

Which of the following is obtained when magnesium chloride reacts with calcium hydroxide?

  1. $Mg(OH) _2$
  2. $Mg$
  3. $Ca$
  4. $CaO$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When magnesium chloride reacts with calcium hydroxide, $Mg(OH) _2$ and $ CaCl _2(aq) $ are obtained.
$MgCl _2(aq) + Ca(OH) _2(aq) \rightarrow  Mg(OH) _2(s) + CaCl _2(aq) $

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

Oxide used to treat indigestion and relieve pain is:

  1. magnesium oxide

  2. magnesium hydroxide

  3. potassium oxide
  4. both $A$ and $B$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Option $(D)$ is correct.

Oxide used to treat indigestion and relieve pain are magnesium oxide and magnesium hydroxide.
They act as an antacid to relieve indigestion, sour stomach, and heartburn.

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

Oxide used to treat indigestion and relieve pain is:

  1. magnesium hydroxide

  2. magnesium oxide

  3. calcium oxide
  4. both $A$ and $B$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Option $(D)$ is correct.
Oxide used to treat indigestion and relieve pain are magnesium hydroxide and magnesium oxide. Heartburn and acid indigestion are caused by excess acid in the stomach. Magnesium oxide and hydroxide treats these stomach problems by neutralizing the acid in the stomach. 
Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

The powder of zinc phosphate cement contain zinc oxide and:

  1. magnesium sulphate

  2. magnesium phosphate

  3. magnesium oxalate

  4. magnesium oxide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Option $(D)$ is correct.
The powder of zinc phosphate cement contains zinc oxide and magnesium oxide. It is used for dentistry, cementation of inlays, crowns, bridges etc.