Chemistry · General trends in properties of the first-row transition elements: physical properties, ionization enthalpy, oxidation states, atomic radii, colour, catalytic behaviour, magnetic properties, complex formation, interstitial compounds, alloy formation
The correct statement is :
The correct statement is :
- A. leaching of bauxite using concentrated \( N a O H \) solution gives sodium aluminate and sodium silicate
- B. The blistered appearance of copper during the metallurgical process is due to the evolution of \( C O_{2} \)
- C. pig iron is obtained from cast iron
- D. the Hall-Heroult process is used for the prodeuction of aluminium and iron.
Step-by-step solution
Option A correctly describes the leaching of bauxite with concentrated NaOH: Al2O3 forms sodium aluminate (NaAlO2) and the impurity SiO2 forms sodium silicate (Na2SiO3), both soluble. Option B is false because blister copper appearance is due to SO2 evolution, not CO2. Option C is false because pig iron is obtained directly from blast furnace and cast iron is made from pig iron. Option D is false because Hall-Heroult process is only for aluminium, not iron.
Related MCQs
- On dissolving moderate amount of sodium metal in liquid ammonia at low temperature, which of the following does not occur?…
- The one that is extensively used as a piezoelectric material is :…
- The spin-only magnetic moment of sodium nitroprusside ion is :…
- Nitric oxide is paramagnetic in :…
- Generally transition elements for coloured salts due to the presence of unpaired electrons. Which of the following compound will be coloured…