NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Chemistry
- Chapter
- General Principles and Processes of Isolation of Metals
NTA Abhyas 2020 · Chemistry · General Principles and Processes of Isolation of Metals
The correct statement is
The correct statement is
Options
- Aleaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate
- Bthe blistered appearance of copper during the metallurgical process is due to the evolution of
- Cpig iron is obtained from cast iron
- Dthe Hall-Heroult process is used for the production of aluminium and iron
Correct answer
A. leaching of bauxite using concentrated NaOH solution gives sodium aluminate and sodium silicate
Step-by-step solution
(1) During leaching when bauxite is treated with concentrated NaOH, then sodium aluminate and sodium silicate is formed in the soluble form, whereas is precipitated.
(2) The blistered appearance of copper during the metallurgical process is due to the evoluation of .
\text{C}{\text{u}_{2}S + \text{2C}{\text{u}_{2}O \to \text{6Cu} + \text{S}{\text{O}_{2}
(3) Cast iron is obtained from pig iron
\mathop{\text{Pig iron}_{4%}\mathop{\overset{\text{blast of}}{→}}_{\text{air}}\mathop{\text{cast iron}_{\text{3%}}
(4) Hall-Heroult process is used for production of only aluminium.
(2) The blistered appearance of copper during the metallurgical process is due to the evoluation of .
\text{C}{\text{u}_{2}S + \text{2C}{\text{u}_{2}O \to \text{6Cu} + \text{S}{\text{O}_{2}
(3) Cast iron is obtained from pig iron
\mathop{\text{Pig iron}_{4%}\mathop{\overset{\text{blast of}}{→}}_{\text{air}}\mathop{\text{cast iron}_{\text{3%}}
(4) Hall-Heroult process is used for production of only aluminium.