Tag: the s-block elements (alkali and alkaline earth metals)

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Questions Related to the s-block elements (alkali and alkaline earth metals)

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.

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

Which of the following is/are the raw materials used to manufacture cement?

  1. Clay

  2. Limestone

  3. Calcium sulphate

  4. Slaked lime
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

The most common raw rock types used in cement production are:

  1. Limestone (supplies the bulk of the lime)
  2. Clay, marl or shale (supplies the bulk of the silica, alumina and ferric oxide)
  3. Other supplementary materials such as sand, fly ash/pulverised fuel ash (PFA), or ironstone to achieve the desired bulk composition