Home
Class 11
CHEMISTRY
Cement is essentially a finely powdered ...

Cement is essentially a finely powdered mixture of calcium silicates and aluminates along with small quantities of gypsum which sets into a hard stone-like mass when treated with water. Which of the following important ingredients present in Portland cement contributes to the maximum extent?

A

Dicalcium silicate

B

Tricalcium silcate

C

Tricalcium aluminate

D

Both (1) and (2)

Text Solution

Verified by Experts

The correct Answer is:
B
Dicalcium silicate `(Ca_(2)SiO_(4))` is 26% trricalcium silicate `(Ca_(3)SiO_(5))` is 51% ad tricalcium aluminate `(Ca_(3)Al_(2)O_(6))` is 11%
Promotional Banner

Topper's Solved these Questions

  • THE S BLOCK ELEMENTS

    R SHARMA|Exercise Question Bank (Level- I)|4 Videos

  • THE S BLOCK ELEMENTS

    R SHARMA|Exercise Question Bank (Level- II)|31 Videos

  • THE S BLOCK ELEMENTS

    R SHARMA|Exercise Follow-up Test 10|31 Videos

  • THE P BLOCK ELEMENTS

    R SHARMA|Exercise Archives|40 Videos

  • THERMODYNAMICS

    R SHARMA|Exercise Archives|59 Videos

Similar Questions

Explore conceptually related problems

Cement is one of the most important building material of the present time. It is a dirty greyish heavy powder containing calcium aluminates and silicates. The important raw materials neede for the manufacture of cement are limestone, clay and gypsum. the main step in the manufacture of cement is the heating of raw meal or slurru in the rotary kiln at a very high temperature 1400-1600^(@)C . Finally 2% or 3% gypsum is added. When cement is mixed with water and left as such for sometime, it becomes a hard mass. This is known as setting of cement. It is believed that varous aluminates and silicates present in the cement form hydrates with water which seperate in the form of gel. the gel formed start losing water partly by evaporation and partly by forming hydrates with unhydrated constituents. this results in the formation of a hard mass. Gypsum is added to portland cement

Cement is one of the most important building material of the present time. It is a dirty greyish heavy powder containing calcium aluminates and silicates. The important raw materials neede for the manufacture of cement are limestone, clay and gypsum. the main step in the manufacture of cement is the heating of raw meal or slurru in the rotary kiln at a very high temperature 1400-1600^(@)C . Finally 2% or 3% gypsum is added. When cement is mixed with water and left as such for sometime, it becomes a hard mass. This is known as setting of cement. It is believed that varous aluminates and silicates present in the cement form hydrates with water which seperate in the form of gel. the gel formed start losing water partly by evaporation and partly by forming hydrates with unhydrated constituents. this results in the formation of a hard mass. Portland cement does not contain

Cement is one of the most important building material of the present time. It is a dirty greyish heavy powder containing calcium aluminates and silicates. The important raw materials neede for the manufacture of cement are limestone, clay and gypsum. the main step in the manufacture of cement is the heating of raw meal or slurru in the rotary kiln at a very high temperature 1400-1600^(@)C . Finally 2% or 3% gypsum is added. When cement is mixed with water and left as such for sometime, it becomes a hard mass. This is known as setting of cement. It is believed that varous aluminates and silicates present in the cement form hydrates with water which seperate in the form of gel. the gel formed start losing water partly by evaporation and partly by forming hydrates with unhydrated constituents. this results in the formation of a hard mass. The percentage of lime in portland cement is approximately

Cement is one of the most important building material of the present time. It is a dirty greyish heavy powder containing calcium aluminates and silicates. The important raw materials neede for the manufacture of cement are limestone, clay and gypsum. the main step in the manufacture of cement is the heating of raw meal or slurru in the rotary kiln at a very high temperature 1400-1600^(@)C . Finally 2% or 3% gypsum is added. When cement is mixed with water and left as such for sometime, it becomes a hard mass. This is known as setting of cement. It is believed that varous aluminates and silicates present in the cement form hydrates with water which seperate in the form of gel. the gel formed start losing water partly by evaporation and partly by forming hydrates with unhydrated constituents. this results in the formation of a hard mass. Setting of cement is

Cement is one of the most important building material of the present time. It is a dirty greyish heavy powder containing calcium aluminates and silicates. The important raw materials neede for the manufacture of cement are limestone, clay and gypsum. the main step in the manufacture of cement is the heating of raw meal or slurru in the rotary kiln at a very high temperature 1400-1600^(@)C . Finally 2% or 3% gypsum is added. When cement is mixed with water and left as such for sometime, it becomes a hard mass. This is known as setting of cement. It is believed that varous aluminates and silicates present in the cement form hydrates with water which seperate in the form of gel. the gel formed start losing water partly by evaporation and partly by forming hydrates with unhydrated constituents. this results in the formation of a hard mass. Concrete is a mixture of

Concrete is produced form a mixture of cement, water and small stones. Small amount of gypsum, CaSO_(4).2H_(2)O is added in coment production to impove the subsequent hardening of concrete. The elevated temperature during the production of cement may lead to the formation of unwanted hemihydrate CaSO_(4)(1)/(2)H_(2)O according to reaction. CaSO_(4)2H_(2)O(s) rarr CaSO_(4)(1)/(2)H_(2)O(s)+(3)/(2)H_(2)O(g) The Delta_(f)H^(Theta) of CaSO_(2).2H_(2)O(s),CaSO_(4)(1)/(2)H_(2)O(s),H_(2)O(g) are -2021.0 kJ mol^(-1), -1575.0 kJ mol^(-1) and -241.8 kJ mol^(-1) , respectively. The respective values of their standard entropies are 194.0, 130.0 and 188.0 J K^(-1)mol^(-1) . The values of R = 8.314JK^(-1)mol^(-1) = 0.0831L bar mol^(-1)K^(-1) . Answer the following questions on the basis of above information. Heat change occuring during conservation of 1kg of CaSO_(4).2H_(2)O(s) (molar mass 172g mol^(-1)) of CaSO_(4)(1)/(2)H_(2)O(s) is equal to

Concerete is produced from a mixture of cement , water, sand and small stones. It consists primarily of calcium silicates and calcium aluminates formed by heating and grinding of clay and limestone. In later steps of cement production a small amount of gypsym , CaSO_(4).2H_(2)O is added to improve subsequent hardening of concrete . The use of elevated temperature during the final production may lead to formation of unwanted hemihydrate, CaSO_(4).1//2H_(2)O. Consider the following reaction: CaSO_(4).2H_(2)O(s) rarr CaSO_(4).(1)/(2) H_(2)O(s)+(3)/(2)H_(2)O(g) The following themodynamic data apply at 25^(@)C standard pressure : 1 bar {:("Compound","DeltaH_(f(KJ//mol))^(@),S^(@)(JK^(-1)mol^(-1))),(CaSO_(4).2H_(2)O(s),-2021.0,194.0),(CaSO_(4).(1)/(2)H_(2)O(s),-1575.0,130.5),(H_(2)O(g),-242.8,188.6):} R=8.314 JK^(-1)mol^(-1) Temperature at which the equillibrium water vapour pressure is 1.00 bar

Concerete is produced from a mixture of cement , water, sand and small stones. It consists primarily of calcium silicates and calcium aluminates formed by heating and grinding of clay and limestone. In later steps of cement production a small amount of gypsym , CaSO_(4).2H_(2)O is added to improve subsequent hardening of concrete . The use of elevated temperature during the final production may lead to formation of unwanted hemihydrate, CaSO_(4).1//2H_(2)O. Consider the following reaction: CaSO_(4).2H_(2)O(s) rarr CaSO_(4).(1)/(2) H_(2)O(s)+(3)/(2)H_(2)O(g) The following themodynamic data apply at 25^(@)C standard pressure : 1 bar {:("Compound","DeltaH_(f(KJ//mol))^(@),S^(@)(JK^(-1)mol^(-1))),(CaSO_(4).2H_(2)O(s),-2021.0,194.0),(CaSO_(4).(1)/(2)H_(2)O(s),-1575.0,130.5),(H_(2)O(g),-242.8,188.6):} R=8.314 JK^(-1)mol^(-1) DeltaH^(@) for the formation of 1.00 kg of CaSO_(4).(1)/(2) H_(2)O(s) from CaSO_(4).2H_(2)O(s) is

R SHARMA-THE S BLOCK ELEMENTS-Follow-up Test 11
  1. A suspension of slaked lime in water is called

    Text Solution

    |

  2. Bleaching powder is prepared by passing chlorine into

    Text Solution

    |

  3. Which of the following changes occur when an excess of CO(2)(g) is pas...

    Text Solution

    |

  4. Limestone rock is the commonest form of calcium carbonate which also o...

    Text Solution

    |

  5. Calcium carbonate, commonly called limestone, is prepared by passing C...

    Text Solution

    |

  6. Which of the following in incorrect for CaCO(3) ?

    Text Solution

    |

  7. Calcium carbonate along with is used as a flux in the extraction of m...

    Text Solution

    |

  8. Calcium carbonate is used as (i) a filler in cosmetics (ii) a cons...

    Text Solution

    |

  9. Plaseter of Paris, a white powder, is

    Text Solution

    |

  10. Plaster of Paris is obtained when gypsum is heated to

    Text Solution

    |

  11. Plaster of Paris has a remarkable property of setting with water. On m...

    Text Solution

    |

  12. The raw materials for the manufacture of Portland cement (or just ceme...

    Text Solution

    |

  13. Cement is essentially a finely powdered mixture of calcium silicates a...

    Text Solution

    |

  14. Which of the following in incorrect ?

    Text Solution

    |

  15. All enzymes that utilize ATP in phosphate transfer require

    Text Solution

    |

  16. The main pigment for the absorption of light in green plants is chloro...

    Text Solution

    |

  17. About 99% of body Ca is present in bones and teeth as

    Text Solution

    |

  18. Ca^(2+) ions play an important role in (i) neuromuscular function ...

    Text Solution

    |

  19. The calcium concentration in plasma is regulated at about mg L^(-1).

    Text Solution

    |

  20. Bone is not an inert and unchanging substance but is continuously bein...

    Text Solution

    |