The ability of metals to be drawn into thin wires is called:
A. Ductility
B. Conductivity
C. Sonority
D. Malleability
Answer: Option A
Solution (By JKExamLibrary)
Ductility is the property of metals by which they can be drawn into thin wires. Gold, silver, and copper are highly ductile. Malleability is the ability to be beaten into thin sheets. Sonority is the property of producing a ringing sound when struck. Conductivity refers to heat or electricity.
Explanation:
Half-life (t₁/₂) is the time taken for half of the radioactive nuclei in a sample to decay. It is constant for a given isotope and independent of initial amount (first-order kinetics). After one half-life, 50% remains; after two, 25%. It is a measure of stability. Short half-life = more radioactive.
Explanation:
Autocatalysis occurs when one of the products of a chemical reaction acts as a catalyst for that same reaction. As the reaction proceeds and the product accumulates, the rate of the reaction increases. A classic example is the oxidation of oxalic acid by potassium permanganate, where the Mn2+ ions produced catalyze the reaction.
Explanation:
Haematite (Fe₂O₃) is a major ore of iron. Bauxite is aluminium ore, galena is lead sulfide, cinnabar is mercury sulfide. Magnetite (Fe₃O₄) is another iron ore.
No comments yet. Be the first to start the discussion!