Tag: some important compounds of magnesium and calcium

Quizzes (0) Questions (185)

Questions Related to some important compounds of magnesium and calcium

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) some important compounds of calcium some important compounds of magnesium and calcium compounds of s block elements

A mixture of cement, gravel, coarse sand and water is called:

  1. mortar

  2. concrete

  3. slurry

  4. hardner
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Concrete is a building material that has high compressive strength and low tensile strength and is composed of a mixture of cement, gravel and sand (aggregates), and water.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) some important compounds of calcium some important compounds of magnesium and calcium compounds of s block elements

Plaster of Paris is obtained by heating:

  1. gypsum

  2. limestone

  3. sodium carbonate

  4. calcium sulphate
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plaster of Paris is made by heating the mineral gypsum. When gypsum is heated to about 150°C it losses water and produces the powder of plaster of Paris.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) some important compounds of calcium some important compounds of magnesium and calcium compounds of s block elements

The common ingredient required for making cement and glass is:

  1. washing soda

  2. baking soda

  3. limestone

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

This glass is typically made using a wet batch process where the composition is primarily limestone, soda ash and silica. 

cement is made by heating limestone (calcium carbonate) with other materials (such as clay) to $1450 ^0C$ in a kiln

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) some important compounds of calcium some important compounds of magnesium and calcium compounds of s block elements

Plaster of paris is obtained by heating gypsum at controlled-temperature.

  1. True

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

Plaster of Paris is prepared by heating gypsum to $120-180℃$.

Hence, the given statement is true that plaster of Paris is prepared by heating gypsum to controlled temperatures.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) some important compounds of calcium some important compounds of magnesium and calcium compounds of s block elements

Cement is a man-made material used in building.

  1. True

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

Cement is manufactured through a controlled chemical combination of calcium, silicon, aluminum, iron and other ingredients. which is used in construction of building.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) some important compounds of calcium some important compounds of magnesium and calcium compounds of s block elements

Limestone sand, gypsum, and coal dust are the materials required for the manufacture of cement.

  1. True

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

The given statement is true. Limestone, sand, gypsum and coal dust are the materials required for the manufacture of cement.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) some important compounds of calcium some important compounds of magnesium and calcium compounds of s block elements

In what ratio are the mixture of cement, gravel and sand mixed to form concrete?

  1. $1:2:4$
  2. $1:3:6$
  3. Both $A$ and $B$
  4. $1:1:1$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For nominal mix design, the standard ratio between cement, gravel and sand, which is as follows:

Cement          : | Gravel            : | Sand | | --- | --- | --- | --- | | M5 | 1 | 5 | 10 | | M7.5 | 1 | 4 | 8 | | M10 | 1 | 3 | 6 | | M15 | 1 | 2 | 4 | | M20 | 1 | 1 | 3 | | M25 | 1 | 1 | 2 |

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) some important compounds of calcium some important compounds of magnesium and calcium compounds of s block elements

Cement balls formed in its manufacturing is called:

  1. portland cement

  2. limestone

  3. clinkers

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

In the manufacture of Portland cement, clinker occurs as lumps or nodules, usually 3 millimetres (0.12 in) to 25 millimetres (0.98 in) in diameter, produced by sintering (fused together without melting to the point of liquefaction) limestone and alumino-silicate materials such as clay during the cement kiln stage.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) some important compounds of calcium some important compounds of magnesium and calcium compounds of s block elements

Finely powdered clay and limestone mixed with water is introduced in:

  1. drum mixer

  2. rotary kiln

  3. pan-type granulator

  4. dryer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A rotary kiln is a pyroprocessing device used to raise materials to a high temperature (calcination) in a continuous process. Materials produced using rotary kilns include cement, lime.

Cement kilns are used for the pyro-processing stage of manufacture of Portland and other types of hydraulic cement, in which calcium carbonate reacts with silica-bearing minerals to form a mixture of calcium silicates.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) some important compounds of calcium some important compounds of magnesium and calcium compounds of s block elements

Cement is the mixture of calcium __________ and calcium ___________, with small amount of gypsum salt.

  1. silicate, carbonate

  2. silicate, aluminate

  3. carbonate, oxide

  4. carbonate, aluminate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
 Compound  Formula  Shorthand form  % by $weight$ 
 Tricalcium aluminate $Ca _3Al _2O _6$  $C _3A$  10 
 Tetracalcium   $Ca _4Al _2Fe _2O _{10}$ $C _4AF$  8 
Belite or dicalcium silicate  $Ca _2SiO _5$  $C _2S$  20 
Alite or tricalcium silicate  $Ca _3SiO _4$  $C _3S$  55 
Sodium oxide  $Na _2O$  $N $
Potassium oxide  $K _2O$  $K $ upto 2 
Gypsum  $CaSO _4.2H _2O$  $CSH _2$  5 

A cement is a binder, a substance used in construction that sets and hardens and can bind other materials together. The most important types of cement are used as a component in the production of mortar in masonry, and of concrete, which is a combination of cement and an aggregate to form a strong building material.