The slag which floats on the surface of the molten iron generally contains (A) Lime (CaO) 45% (B) Silica (SiO2) 35% (C) Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% (D) All the above

The slag which floats on the surface of the molten iron generally contains
(A) Lime (CaO) 45%
(B) Silica (SiO2) 35%
(C) Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8%
(D) All the above
by

1 Answer

Answer :

Answer: Option D
by

Related questions

The slag which floats on the surface of the molten iron generally contains (A) Lime (CaO) 45% (B) Silica (SiO2) 35% (C) Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% (D) All these

Description : The slag which floats on the surface of the molten iron generally contains (A) Lime (CaO) 45% (B) Silica (SiO2) 35% (C) Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% (D) All these

Last Answer : Answer: Option D

Which of the following is an acidic constituent of B.F. slag? (A) SiO2 (B) FeO (C) MgO (D) CaO

Description : Which of the following is an acidic constituent of B.F. slag? (A) SiO2 (B) FeO (C) MgO (D) CaO

Last Answer : Option A

Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is (A) 5CaO. 3 Al2O3 (B) 3CaO. Al2O3 (C) 3CaO. SiO2 (D) 2CaO. SiO2

Description : Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is (A) 5CaO. 3 Al2O3 (B) 3CaO. Al2O3 (C) 3CaO. SiO2 (D) 2CaO. SiO2

Last Answer : Option A

Cement mainly contains (A) CaO, SiO2 , Al2O3 (B) MgO, SiO2 , K2O (C) Al2O3 , MgO, Fe2O3 (D) CaO, MgO, K2O

Description : Cement mainly contains (A) CaO, SiO2 , Al2O3 (B) MgO, SiO2 , K2O (C) Al2O3 , MgO, Fe2O3 (D) CaO, MgO, K2O

Last Answer : (A) CaO, SiO2 , Al2O3

9. Which of the following is an acidic constituent of B.F. slag? (A) SiO2 (B) FeO (C) MgO

Description : 9. Which of the following is an acidic constituent of B.F. slag? (A) SiO2 (B) FeO (C) MgO

Last Answer : Option A

Pick up the correct statement from the following: (A) Roasting is not necessary if iron ore is an oxide (B) Impurities float on the molten iron as slag (C) The slag contains lime about 45% (D) All the above

Description : Pick up the correct statement from the following: (A) Roasting is not necessary if iron ore is an oxide (B) Impurities float on the molten iron as slag (C) The slag contains lime about 45% (D) All the above

Last Answer : Answer: Option D

Ganister contains maximum percentage of (A) FeO (B) SiO2 (C) MgO

Description : Ganister contains maximum percentage of (A) FeO (B) SiO2 (C) MgO

Last Answer : (B) SiO2

More than 95% of __________ is present in corundum. (A) SiO2 (B) Al2O3 (C) CaSiO2 (D) MgO

Description : More than 95% of __________ is present in corundum. (A) SiO2 (B) Al2O3 (C) CaSiO2 (D) MgO

Last Answer : B) Al2O3

Portland cement consists mainly of (A) CaO & SiO2 (B) SiO2 & Al2O3 (C) CaO & Al2O3 (D) CaO & Fe2O3

Description : Portland cement consists mainly of (A) CaO & SiO2 (B) SiO2 & Al2O3 (C) CaO & Al2O3 (D) CaO & Fe2O3

Last Answer : (A) CaO & SiO2

Which of the following is the second major component of cement? (A) Al2O3(B) SiO2(C) CaO(D) Fe2O3

Description : Which of the following is the second major component of cement? (A) Al2O3 (B) SiO2 (C) CaO (D) Fe2O3

Last Answer : (B) SiO2

How many of the following liberate `O_(2)` on heating in a dry test tube ? `CaO, Fe_(2)O_(3), Fe_(3)O_(4), FeO, Cr_(2)O_(3), XeF_(4), Al_(2)O_(3), MgO

Description : How many of the following liberate `O_(2)` on heating in a dry test tube ? `CaO, Fe_(2)O_(3), Fe_(3)O_(4), FeO, Cr_(2)O_(3), XeF_(4), Al_(2)O_(3), MgO

Last Answer : How many of the following liberate `O_(2)` on heating in a dry test tube ? `CaO, Fe_(2)O_(3), Fe_(3)O_(4), ... 3), XeF_(4), Al_(2)O_(3), MgO, Na_(2)O`

Which raw material is used to impart colour to the glass? a) Al2O3 b) CoO c) CaO d) MgO

Description : Which raw material is used to impart colour to the glass? a) Al2O3 b) CoO c) CaO d) MgO

Last Answer : b) CoO

(3) preventing rapid setting of cement Explanation: Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates, the remainder consisting of aluminium- and ironcontaining clinker phases and other compounds. The ratio of CaO to SiO2 shall not be less than 2.0. The magnesium oxide content (MgO) shall not exceed 5.0% by mass. Cement sets when mixed with water by way of a complex series of chemical reactions still only partly understood.

Description : (3) preventing rapid setting of cement Explanation: Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates, the remainder consisting of ... mixed with water by way of a complex series of chemical reactions still only partly understood.

Last Answer : Milk is a colloidal system in which: (1) Water is dispersed in fat (2) Fat is dispersed in water (3) Fat and water are dispersed in each other (4) Fat is dissolved

White cement contains less amount of ___________ [ A ] Lime [ B ] Silica [ C ] Alumina [ D ] Iron oxide

Description : White cement contains less amount of ___________ [ A ] Lime [ B ] Silica [ C ] Alumina [ D ] Iron oxide

Last Answer : [ D ] Iron oxide

Low grade phosphate rock can be used in electrical furnace, because (A) Of the better CaO/SiO2 balance for slag formation (B) CaO content is less (C) It is cheap (D) It produces low cost product

Description : Low grade phosphate rock can be used in electrical furnace, because (A) Of the better CaO/SiO2 balance for slag formation (B) CaO content is less (C) It is cheap (D) It produces low cost product

Last Answer : (A) Of the better CaO/SiO2 balance for slag formation

Slag is a name given for - (1) molten iron (2) molten sand (3) molten alumina (4) molten calcium silicate

Description : Slag is a name given for - (1) molten iron (2) molten sand (3) molten alumina (4) molten calcium silicate

Last Answer : (3) molten alumina Explanation: Slag is a partially vitreous byproduct of the process of smelting ore, which separates the desired metal fraction from the unwanted fraction. A good example is steelmaking ... separated from the metal, and assist in the removal of sulfur and phosphorus from the steel.

Slag is a name given for (1) molten iron (2) molten sand (3) molten alumina (4) molten calcium silicate

Description : Slag is a name given for (1) molten iron (2) molten sand (3) molten alumina (4) molten calcium silicate

Last Answer : molten alumina

Identify the correct statement with reference to the extractive metallurgy of aluminium. (A) The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3 (B) Approximately 80% of the aluminium deposited on the cathode comes from cryolite (C) Sodium is deposited along with aluminium, but is immediately vaporised (D) Anode effect sets in when the cryolite concentration goes below 40%.

Description : Identify the correct statement with reference to the extractive metallurgy of aluminium. (A) The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3 (B) Approximately 80% of ... is immediately vaporised (D) Anode effect sets in when the cryolite concentration goes below 40%.

Last Answer : (A) The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3

36. Aluminium is extracted from alumina (Al2O3 ) by electrolysis of a molten mixture of : (1) Al2O3 + KF + Na3AlF6 (2) Al2O3 + HF + NaAlF4 (3) Al2O3 + CaF2 + NaAlF4 (4) Al2O3 + Na3AlF6 + CaF2

Description : 36. Aluminium is extracted from alumina (Al2O3 ) by electrolysis of a molten mixture of : (1) Al2O3 + KF + Na3AlF6 (2) Al2O3 + HF + NaAlF4 (3) Al2O3 + CaF2 + NaAlF4 (4) Al2O3 + Na3AlF6 + CaF2

Last Answer : Al2O3 + Na3AlF6 + CaF2

Pick up the correct proportions of chemical ingredients of cement (A) Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3 (B) Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3 (C) Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3 (D) Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3

Description : Pick up the correct proportions of chemical ingredients of cement (A) Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3 (B) Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3 (C) Alumina : Silica : ... oxide : 63 : 22 : 6 : 3 (D) Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3

Last Answer : Answer: Option A

The main ingredients of Portland cement are (A) Lime and silica (B) Lime and alumina (C) Silica and alumina (D) Lime and iron

Description : The main ingredients of Portland cement are (A) Lime and silica (B) Lime and alumina (C) Silica and alumina (D) Lime and iron

Last Answer : Answer: Option A

Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth? (A) Lime stone and alumina (B) Silica and alkalies (C) Alumina and iron (D) Alkalies and magnesium

Description : Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth? (A) Lime stone and alumina (B) Silica and alkalies (C) Alumina and iron (D) Alkalies and magnesium

Last Answer : Answer: Option B

Which of the following ingredient of cement when added in excess quantity, causes the cement to set slowly. (a) Lime (b) Silica (c) Alumina (d) Iron oxide

Description : Which of the following ingredient of cement when added in excess quantity, causes the cement to set slowly. (a) Lime (b) Silica (c) Alumina (d) Iron oxide

Last Answer : Lime is a common ingredient in cement. It is typically added in small amounts to help the cement set more quickly. Adding too much lime can cause the cement to set slowly. Alumina, silica, and iron oxide are also common ingredients in cement, but they do not have an effect on the setting time.

The proportion of lime, silica, alumina and iron oxide in a Portland cement is (a) 63:22:6:3 (b) 63:22:3:6 (c) 22:63:6:3 (d) All the above

Description : The proportion of lime, silica, alumina and iron oxide in a Portland cement is (a) 63:22:6:3 (b) 63:22:3:6 (c) 22:63:6:3 (d) All the above

Last Answer : (a) 63:22:6:3

The maximum percentage of chemical ingredient of cement is (a) Alumina (b) Iron oxide (c) Lime (d) Silica

Description : The maximum percentage of chemical ingredient of cement is (a) Alumina (b) Iron oxide (c) Lime (d) Silica

Last Answer : (c) Lime

Slate (A) Is a metamorphic rock (B) Splits into thin sheets along its bedding planes (C) Has a smooth surface and contains alumina and silica (D) Possesses good water absorption capacity

Description : Slate (A) Is a metamorphic rock (B) Splits into thin sheets along its bedding planes (C) Has a smooth surface and contains alumina and silica (D) Possesses good water absorption capacity

Last Answer : Answer: Option A

Pick up the correct statement from the following: (A) Lime in excess, causes the cement to expand and disintegrate (B) Silica in excess, causes the cement to set slowly (C) Alumina in excess, reduces the strength of the cement (D) All the above

Description : Pick up the correct statement from the following: (A) Lime in excess, causes the cement to expand and disintegrate (B) Silica in excess, causes the cement to set slowly (C) Alumina in excess, reduces the strength of the cement (D) All the above

Last Answer : Answer: Option D

The minimum percentage of silica, alumina and ferric oxide in lime for white washing, is (A) 20 (B) 15 (C) 5 (D) 0

Description : The minimum percentage of silica, alumina and ferric oxide in lime for white washing, is (A) 20 (B) 15 (C) 5 (D) 0

Last Answer : Answer: Option D

The main ingredient of a good quality brick earth, is (A) Magnesia (B) Lime (C) Silica (D) Alumina

Description : The main ingredient of a good quality brick earth, is (A) Magnesia (B) Lime (C) Silica (D) Alumina

Last Answer : Answer: Option D

A good brick earth should contain: (A) About 20% to 30% of alumina (B) About 50% to 60% of silica (C) Not more than 5% of lime (D) All the above

Description : A good brick earth should contain: (A) About 20% to 30% of alumina (B) About 50% to 60% of silica (C) Not more than 5% of lime (D) All the above

Last Answer : Answer: Option D

Pick up the correct statement from the following: (A) The lime in excess makes the cement unsound and causes the cement to expand and disintegrate (B) The silica in excess makes the cement stronger but its setting time also increases (C) The excess amount of alumina weakens the cement (D) All the above

Description : Pick up the correct statement from the following: (A) The lime in excess makes the cement unsound and causes the cement to expand and disintegrate (B) The silica in excess makes the cement stronger ... time also increases (C) The excess amount of alumina weakens the cement (D) All the above

Last Answer : Answer: Option D

Stainless steel contains (A) 18% of chromium and 8% nickel (B) 8% of chromium and 18% of nickel (C) 12% of chromium and 36% of nickel (D) 36% of chromium and 12% of nickel

Description : Stainless steel contains (A) 18% of chromium and 8% nickel (B) 8% of chromium and 18% of nickel (C) 12% of chromium and 36% of nickel (D) 36% of chromium and 12% of nickel

Last Answer : Answer: Option A

otton seed contains oil upto a] 10-12% b] 15-20% c] 30-35% d] 24-28%

Description : otton seed contains oil upto a] 10-12% b] 15-20% c] 30-35% d] 24-28%

Last Answer : b] 15-20%

Limestone addition in the blast furnace is done to flux __________ present in the raw materials. (A) SiO2 (B) Al2O3 (C) MnO2 (D) P

Description : Limestone addition in the blast furnace is done to flux __________ present in the raw materials. (A) SiO2 (B) Al2O3 (C) MnO2 (D) P

Last Answer : Limestone addition in the blast furnace is done to flux __________ present in the raw materials. (A) SiO2 (B) Al2O3 (C) MnO2 (D) P

The main constituents of glass is (A) SiO2 (B) B2O3 (C) Al2O3 (D) Cr2O3

Description : The main constituents of glass is (A) SiO2 (B) B2O3 (C) Al2O3 (D) Cr2O3

Last Answer : (A) SiO2

The major constituents of glass are (A) Lime, clay and soda ash (B) Sand, lime and soda ash (C) Silica, alumina and clay (D) Silica, alumina and soda ash

Description : The major constituents of glass are (A) Lime, clay and soda ash (B) Sand, lime and soda ash (C) Silica, alumina and clay (D) Silica, alumina and soda ash

Last Answer : (B) Sand, lime and soda ash

Which of the following constituents impart plasticity to brick earth a) Alumina* b) Silica c) Lime d) Magnesia

Description : Which of the following constituents impart plasticity to brick earth a) Alumina* b) Silica c) Lime d) Magnesia

Last Answer : a) Alumina*

The main ingredients of Portland cement are a) Lime and silica* b) Lime and Alumina c) Alumina magnesia d) Silica and Alumina

Description : The main ingredients of Portland cement are a) Lime and silica* b) Lime and Alumina c) Alumina magnesia d) Silica and Alumina

Last Answer : a) Lime and silica*

Pick up the incorrect statement from the following: (A) Porosity of clay sand soil is 45% (B) Porosity of pure sand is 35% (C) Porosity of sand stone is up to 15% (D) None of these

Description : Pick up the incorrect statement from the following: (A) Porosity of clay sand soil is 45% (B) Porosity of pure sand is 35% (C) Porosity of sand stone is up to 15% (D) None of these

Last Answer : (D) None of these

Permanent magnets are made of high carbon steel and (A) 15% of cobalt (B) 20% of cobalt (C) 35% of cobalt (D) 45% of cobalt

Description : Permanent magnets are made of high carbon steel and (A) 15% of cobalt (B) 20% of cobalt (C) 35% of cobalt (D) 45% of cobalt

Last Answer : Answer: Option D

Which one of the following is classified as a covalent network solid crystal? w) CaO x) SiO2 y) CO2 z) Pb

Description : Which one of the following is classified as a covalent network solid crystal? w) CaO x) SiO2 y) CO2 z) Pb

Last Answer : ANSWER: B -- SiO2

Identify the type of soil on the basis of the given characteristics - 1. They are rich in lime, iron, magnesia and alumina. 2. They are generally clayey, deep and impermeable. 3. They are mainly found in Maharashtra, Madhya Pradesh and Gujarat. Select the correct answer from the given alternatives - a. Laterite soil b. Red and yellow soil c. Saline soil d. Black soil

Description : Identify the type of soil on the basis of the given characteristics - 1. They are rich in lime, iron, magnesia and alumina. 2. They are generally clayey, deep and impermeable. 3. They are mainly found ... the given alternatives - a. Laterite soil b. Red and yellow soil c. Saline soil d. Black soil

Last Answer : d. Black soil

Efflorescence in cement is caused due to an excess of (A) Alumina (B) Iron oxide (C) Silica (D) Alkalis

Description : Efflorescence in cement is caused due to an excess of (A) Alumina (B) Iron oxide (C) Silica (D) Alkalis

Last Answer : Answer: Option D

Which of the following ingredients of the brick earth enables the brick to retain its shape? (A) Alumina (B) Silica (C) Iron (D) Magnesia

Description : Which of the following ingredients of the brick earth enables the brick to retain its shape? (A) Alumina (B) Silica (C) Iron (D) Magnesia

Last Answer : Answer: Option B

Efflorescence in cement is caused due to an excess of [ A ] Alkalies [ B ] Silica [ C ] Iron oxide [ D ] Alumina

Description : Efflorescence in cement is caused due to an excess of [ A ] Alkalies [ B ] Silica [ C ] Iron oxide [ D ] Alumina

Last Answer : [ A ] Alkalies

When copper pyrites is roasted in excess of air, a mixture of `CuO + FeO` is formed. `FeO` is present as impurity. This can be removed as slag during

Description : When copper pyrites is roasted in excess of air, a mixture of `CuO + FeO` is formed. `FeO` is present as impurity. This can be removed as slag during

Last Answer : When copper pyrites is roasted in excess of air, a mixture of `CuO + FeO` is formed. `FeO` is present ... a basic flux D. CaO, which is a basic flux

Why is slag collected above molten iron?

Description : Why is slag collected above molten iron?

Last Answer : Slag is lighter than molten iron and collects above molten iron. Slag prevents oxidations of molten iron back into iron oxide.

furnace slag is mainly molten (A) Sand (B) Magnesium silicate (C) Calcium silicate (D) Iron pyrite

Description : furnace slag is mainly molten (A) Sand (B) Magnesium silicate (C) Calcium silicate (D) Iron pyrite

Last Answer : Option C

Dephosphorization of molten pig iron is favoured by (A) Oxidising and basic slag (B) Reducing and basic slag (C) High activity co-efficient of phosphorous in metal (D) Oxidising and neutral slag

Description : Dephosphorization of molten pig iron is favoured by (A) Oxidising and basic slag (B) Reducing and basic slag (C) High activity co-efficient of phosphorous in metal (D) Oxidising and neutral slag

Last Answer : Option B

The minimum percentage of chemical ingredient of cement is that of (A) Magnesium oxide (B) Iron oxide (C) Alumina (D) Lime

Description : The minimum percentage of chemical ingredient of cement is that of (A) Magnesium oxide (B) Iron oxide (C) Alumina (D) Lime

Last Answer : Answer: Option A