\(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}+2 \mathrm{Al} \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{Cr}}\) Al metal displace \(\mathrm{\mathrm{Cr}}\) from \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\) of high temperature in Alumino thermite process.
NEET - 2021
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321128
Select the correct statement:
1 Roasting involves heating the ore in the absence of air.
2 Calcination involves heating the ore above its melting point.
3 Smelting involves heating the ore with suitable reducing agent and flux below it melting point.
4 Calcination of calcium carbonate is endothermic.
Explanation:
Calcination is heating and is endothermic. So, the correct option is (4).
KCET - 2024
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321129
Which of the following is used to reduce \(\mathrm{\mathrm{TiCl}_{4}}\) to Ti?
1 \(\mathrm{\mathrm{C}}\)
2 \(\mathrm{\mathrm{Al}}\)
3 \(\mathrm{\mathrm{Mg}}\)
4 \(\mathrm{\mathrm{H}_{2}}\)
Explanation:
Mg is used to convert \({\text{TiC}}{{\text{l}}_{\text{4}}}\) to Ti and the process is known as Kroll process.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321130
Carbon cannot be used in the reduction of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) because:
1 It is non-metal
2 The heat of formation of \(\mathrm{\mathrm{CO}_{2}}\) is more than that of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\)
3 Pure carbon is not easily available
4 The heat of formation of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) is too high
Explanation:
In Ellingham diagram, the \({{\rm{\Delta }}_{\rm{f}}}{{\rm{G}}^{\rm{{\rm O}}}}\)of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) lies below that of \(\mathrm{\mathrm{CO}_{2}}\). If reduction is carried out at very high temperature, the \(\mathrm{\mathrm{Al}}\) produced will react with carbon forming \(\mathrm{\mathrm{Al}_{4} \mathrm{C}_{3}}\).
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
\(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}+2 \mathrm{Al} \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{Cr}}\) Al metal displace \(\mathrm{\mathrm{Cr}}\) from \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\) of high temperature in Alumino thermite process.
NEET - 2021
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321128
Select the correct statement:
1 Roasting involves heating the ore in the absence of air.
2 Calcination involves heating the ore above its melting point.
3 Smelting involves heating the ore with suitable reducing agent and flux below it melting point.
4 Calcination of calcium carbonate is endothermic.
Explanation:
Calcination is heating and is endothermic. So, the correct option is (4).
KCET - 2024
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321129
Which of the following is used to reduce \(\mathrm{\mathrm{TiCl}_{4}}\) to Ti?
1 \(\mathrm{\mathrm{C}}\)
2 \(\mathrm{\mathrm{Al}}\)
3 \(\mathrm{\mathrm{Mg}}\)
4 \(\mathrm{\mathrm{H}_{2}}\)
Explanation:
Mg is used to convert \({\text{TiC}}{{\text{l}}_{\text{4}}}\) to Ti and the process is known as Kroll process.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321130
Carbon cannot be used in the reduction of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) because:
1 It is non-metal
2 The heat of formation of \(\mathrm{\mathrm{CO}_{2}}\) is more than that of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\)
3 Pure carbon is not easily available
4 The heat of formation of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) is too high
Explanation:
In Ellingham diagram, the \({{\rm{\Delta }}_{\rm{f}}}{{\rm{G}}^{\rm{{\rm O}}}}\)of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) lies below that of \(\mathrm{\mathrm{CO}_{2}}\). If reduction is carried out at very high temperature, the \(\mathrm{\mathrm{Al}}\) produced will react with carbon forming \(\mathrm{\mathrm{Al}_{4} \mathrm{C}_{3}}\).
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
\(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}+2 \mathrm{Al} \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{Cr}}\) Al metal displace \(\mathrm{\mathrm{Cr}}\) from \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\) of high temperature in Alumino thermite process.
NEET - 2021
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321128
Select the correct statement:
1 Roasting involves heating the ore in the absence of air.
2 Calcination involves heating the ore above its melting point.
3 Smelting involves heating the ore with suitable reducing agent and flux below it melting point.
4 Calcination of calcium carbonate is endothermic.
Explanation:
Calcination is heating and is endothermic. So, the correct option is (4).
KCET - 2024
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321129
Which of the following is used to reduce \(\mathrm{\mathrm{TiCl}_{4}}\) to Ti?
1 \(\mathrm{\mathrm{C}}\)
2 \(\mathrm{\mathrm{Al}}\)
3 \(\mathrm{\mathrm{Mg}}\)
4 \(\mathrm{\mathrm{H}_{2}}\)
Explanation:
Mg is used to convert \({\text{TiC}}{{\text{l}}_{\text{4}}}\) to Ti and the process is known as Kroll process.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321130
Carbon cannot be used in the reduction of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) because:
1 It is non-metal
2 The heat of formation of \(\mathrm{\mathrm{CO}_{2}}\) is more than that of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\)
3 Pure carbon is not easily available
4 The heat of formation of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) is too high
Explanation:
In Ellingham diagram, the \({{\rm{\Delta }}_{\rm{f}}}{{\rm{G}}^{\rm{{\rm O}}}}\)of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) lies below that of \(\mathrm{\mathrm{CO}_{2}}\). If reduction is carried out at very high temperature, the \(\mathrm{\mathrm{Al}}\) produced will react with carbon forming \(\mathrm{\mathrm{Al}_{4} \mathrm{C}_{3}}\).
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
\(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}+2 \mathrm{Al} \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{Cr}}\) Al metal displace \(\mathrm{\mathrm{Cr}}\) from \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\) of high temperature in Alumino thermite process.
NEET - 2021
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321128
Select the correct statement:
1 Roasting involves heating the ore in the absence of air.
2 Calcination involves heating the ore above its melting point.
3 Smelting involves heating the ore with suitable reducing agent and flux below it melting point.
4 Calcination of calcium carbonate is endothermic.
Explanation:
Calcination is heating and is endothermic. So, the correct option is (4).
KCET - 2024
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321129
Which of the following is used to reduce \(\mathrm{\mathrm{TiCl}_{4}}\) to Ti?
1 \(\mathrm{\mathrm{C}}\)
2 \(\mathrm{\mathrm{Al}}\)
3 \(\mathrm{\mathrm{Mg}}\)
4 \(\mathrm{\mathrm{H}_{2}}\)
Explanation:
Mg is used to convert \({\text{TiC}}{{\text{l}}_{\text{4}}}\) to Ti and the process is known as Kroll process.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321130
Carbon cannot be used in the reduction of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) because:
1 It is non-metal
2 The heat of formation of \(\mathrm{\mathrm{CO}_{2}}\) is more than that of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\)
3 Pure carbon is not easily available
4 The heat of formation of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) is too high
Explanation:
In Ellingham diagram, the \({{\rm{\Delta }}_{\rm{f}}}{{\rm{G}}^{\rm{{\rm O}}}}\)of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) lies below that of \(\mathrm{\mathrm{CO}_{2}}\). If reduction is carried out at very high temperature, the \(\mathrm{\mathrm{Al}}\) produced will react with carbon forming \(\mathrm{\mathrm{Al}_{4} \mathrm{C}_{3}}\).
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
\(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}+2 \mathrm{Al} \longrightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{Cr}}\) Al metal displace \(\mathrm{\mathrm{Cr}}\) from \(\mathrm{\mathrm{Cr}_{2} \mathrm{O}_{3}}\) of high temperature in Alumino thermite process.
NEET - 2021
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321128
Select the correct statement:
1 Roasting involves heating the ore in the absence of air.
2 Calcination involves heating the ore above its melting point.
3 Smelting involves heating the ore with suitable reducing agent and flux below it melting point.
4 Calcination of calcium carbonate is endothermic.
Explanation:
Calcination is heating and is endothermic. So, the correct option is (4).
KCET - 2024
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321129
Which of the following is used to reduce \(\mathrm{\mathrm{TiCl}_{4}}\) to Ti?
1 \(\mathrm{\mathrm{C}}\)
2 \(\mathrm{\mathrm{Al}}\)
3 \(\mathrm{\mathrm{Mg}}\)
4 \(\mathrm{\mathrm{H}_{2}}\)
Explanation:
Mg is used to convert \({\text{TiC}}{{\text{l}}_{\text{4}}}\) to Ti and the process is known as Kroll process.
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
321130
Carbon cannot be used in the reduction of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) because:
1 It is non-metal
2 The heat of formation of \(\mathrm{\mathrm{CO}_{2}}\) is more than that of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\)
3 Pure carbon is not easily available
4 The heat of formation of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) is too high
Explanation:
In Ellingham diagram, the \({{\rm{\Delta }}_{\rm{f}}}{{\rm{G}}^{\rm{{\rm O}}}}\)of \(\mathrm{\mathrm{Al}_{2} \mathrm{O}_{3}}\) lies below that of \(\mathrm{\mathrm{CO}_{2}}\). If reduction is carried out at very high temperature, the \(\mathrm{\mathrm{Al}}\) produced will react with carbon forming \(\mathrm{\mathrm{Al}_{4} \mathrm{C}_{3}}\).
CHXII06:GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
