An alkaline earth metal. 1. Potassium 2. Calcium 3. Lead 4. Copper
Calcium Reason — It belongs to group II A of the periodic table, hence it is an alkaline earth metal.
1. Name a metal found abundantly in the earth’s crust. 2. Difference between calcination and roasting? 3. Name the process used for the enrichment of sulphide ore. 4. Write the chemical formulae of one main ore each of iron and aluminium. 5. Write the constituents of the electrolyte for the extraction of aluminium.
Aluminium is found abundantly in the earth's crust. Difference between calcination and roasting is as follows: Calcination Roasting It is the process of heating the concentrated ore in a limited supply…
Select the correct property which is not true for metals: 1. Metals are good conductors of electricity 2. Metals are malleable and ductile 3. Non-polar covalent compounds are formed from metals 4. Metals have 1, 2 or 3 valence electrons.
Non-polar covalent compounds are formed from metals. Reason A non-polar covalent compound is formed when electrons are shared equally between two atoms and metals generally donate electrons and form bonds.…
State the main constituent metal in each alloy : (i) Duralumin (ii) Brass (iii) Stainless steel
(i) Aluminium (ii) Copper (iii) Iron
State the property of the metal utilized in Aluminium in Thermite welding.
Aluminium is a strong reducing agent and has a strong affinity for oxygen. It reduces Fe2O3, to Fe which fills the gap. Hence it is used for thermite (Fe2O3) welding.
The sketch illustrates refining of aluminium by Hoope’s process. [reference] 
(i) Which of A and B is the cathode and which one is the anode? (ii) What is the electrolyte in the tank? (iii) What material is used for the cathode?
(i) A is cathode and B is anode. (ii) Mixture of cryolite, BaF2, AlF, CaF2 serves as the electrolyte (iii) Pure molten aluminium with carbon electrodes serves as the cathode.
Correct the following statement — Haematite is the chief ore of aluminium.
Haematite is the chief ore of iron. Or Bauxite is the chief ore of aluminium.
The following is a sketch of an electrolytic cell used in the extraction of aluminium : 
(i) What is the substance of which the electrodes A and B are made? (ii) At which electrode (A or B) is the aluminium formed ? (iii) What are the two aluminium compounds in the electrolyte C ? (iv) Why is it necessary for electrode B to be continuously replaced ?
(i) Electrodes A and B are made of graphite (carbon). (ii) Aluminium is formed at cathode (i.e., electrode A). (iii) Fused alumina (Al2O3) and Cryolite (Na3AlF6) are the compounds in the electrolyte C. (iv)…