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Q. What is Calcinations process?
This is fie method of heating the concentrated ore in a limited supply of air to a high temperature but under the fusion temperature. In calcinations, volatile constituents of an ore are expelled. Hydrated and Hydroxide ores lose their water forming metal oxides. In case of carbonate ores, carbon dioxide is lost and metal oxides are made.
Pennies made after 1982 are made of 97.5% zinc and 2.5% copper instead of 95% copper and 5% zinc. Pree 1982 pennies weighed 3.10g. The penny contained 2.95g of zinc and 0.15g of co
write a short note on colour and constitution
Copper=54.1%, oxygen=20.1% and the balance sulfur. Could this also be the molecular formula? What other data is needed?
Perfluorocarbons (PFCs): Perfluorocarbons (C n F 2n+2 ) are acquired by controlled fluorination of vapourized alkanes diluted along with nitrogen gas in the existence of a cata
What is sublimation?
What is the effect of more electronegative atom on the strength of ionic bond: (1) Decreases (2) Increase (3) Decreases slowly (4) Remains the same Ans: Increase
Explain Carbocation The mechanism is a sequence of two Brønsted acid-base reactions. In the first (step a), the double bond is protonated to give a tertiary carbocation; in the
Q. How to change in Oxidation Number in Redox Reactions? Ans. In reduction-oxidation, or redox, reactions, atoms undergo changes in their oxidation numbers. Consider th
theory of NaOH Vs NH4Cl
Which of the following substances has covalent bonding: (1) Germanium (2) Sodium chloride (3) Solid neon (4) Copper Ans: Germanium
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