Quiz about S-BLOCK-GROUP-2-ALKALINE-EARTH-METALS IN GENERAL AWARENESS

Question 1

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 containA. `CaSiO_(4)`B. `CaSiO_(3)`C. `Ca_(3).Al_(2)O_(6)`D. `Ca_(3)(PO_(4))_(2)`

Accepted Answer

NA

Question 2

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 approximatelyA. `20-25%`B. `30-45%`C. `60-65%`D. `40-50%`

Accepted Answer

NA

Question 3

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 cementA. To fasten the process of settingB. To slow down the process of settingC. To improve the colour of the cementD. All of the above are incorrect

Accepted Answer

NA

Question 4

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 isA. Exothermic reactionB. Endothermic reacitonC. Hydration processD. None of these

Accepted Answer

NA

Question 5

`BeSO_(4)` is soluble in water but `BaSO_(4)` is insoluble. Reason (R ) Lattice enthalpy of `BaSO_(4)` exceeds its hydration enthalpy.A. If both `(A)` and `(R )` are correct and `(R )` is the correct explanation of `(A)`.B. If both `(A)` and `(R )` are correct but `(R )` is not the correct explanation of `(A)`.C. If `(A)` is correct but `(R )` is incorrect.D. If `(A)` is incrrect but `(R )` is correct.

Accepted Answer

NA

Question 6

Arrange the following sulphates of alkaline earth metals in order of decreasing thermal stability `BeSO_(4)MgSO_(4)CaSO_(4)SrSO_(4)`.

Accepted Answer

NA

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Arrange the following sulphates of alkaline earth metals in order of decreasing thermal stability: `BeSO_(4),MgSO_(4),CaSO_(4),SrSO_(4)`.

101.	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 containA. `CaSiO_(4)`B. `CaSiO_(3)`C. `Ca_(3).Al_(2)O_(6)`D. `Ca_(3)(PO_(4))_(2)`
Answer» Correct Answer - D Portland cement contains calcium aluminates and silicates and not phosphates.

102.	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 approximatelyA. `20-25%`B. `30-45%`C. `60-65%`D. `40-50%`
Answer» Correct Answer - C lime is around 60-65 percent.

103.	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 cementA. To fasten the process of settingB. To slow down the process of settingC. To improve the colour of the cementD. All of the above are incorrect
Answer» Correct Answer - B it slows down the process of setting.

104.	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 isA. Exothermic reactionB. Endothermic reacitonC. Hydration processD. None of these
Answer» Correct Answer - A::C exothermic reaction and hydration process.

105.	`BeSO_(4)` is soluble in water but `BaSO_(4)` is insoluble. Reason (R ): Lattice enthalpy of `BaSO_(4)` exceeds its hydration enthalpy.A. If both `(A)` and `(R )` are correct and `(R )` is the correct explanation of `(A)`.B. If both `(A)` and `(R )` are correct, but `(R )` is not the correct explanation of `(A)`.C. If `(A)` is correct, but `(R )` is incorrect.D. If `(A)` is incrrect, but `(R )` is correct.
Answer» Correct Answer - A

106.	Arrange the following sulphates of alkaline earth metals in order of decreasing thermal stability: `BeSO_(4),MgSO_(4),CaSO_(4),SrSO_(4)`.
Answer» Sulphate decompose on heating to give the corresponding oxide. `MgSO_(4)overset(Delta)(rarr)MgO+SO_(2)+(1)/(2)O_(2)` The stability increases as the electropositive character of the metal or basic nature of the metal increases down the group `(darr)`. This is clear form the increasing decomposition temperature down the group. `1647 K 1422 K 1168 K773 Krarr` Temperature of decomposition `SrSO_(4) gt CaSO_(4) gt MgSO_(4) gt BeSO_(4)`