Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present ?
In electrolytic refining of copper, the common elements present in anode mud are selenium, tellurium, silver, gold, platinum and antimony.
These elements are very less reactive and are not affected during the purification process. Hence, they settle down below the anode as anode mud.
What is the significance of leaching in the extraction of aluminium?
Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.
Copper can be extracted by hydrometallurgy but not zinc. Explain.
Outline the principles of refining of metals by the following methods:
(i) Zone refining
(ii) Electrolytic refining
(iii) Vapour phase refining
The reaction,
Cr2O3 + 2Al → Al2O3 + 2Cr (ΔGo = -421kJ)
is thermodynamically feasible as is apparent from the Gibbs energy value. Why does it not take place at room temperature?
How can you separate alumina from silica in bauxite ore associated with silica? Give equations, if any.
Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?
Write chemical reactions taking place in the extraction of zinc from zinc blende.
Describe a method for refining nickel.
Why copper matte is put in silica lined converter?
For the reaction R → P, the concentration of a reactant changes from 0.03 M to 0.02 M in 25 minutes. Calculate the average rate of reaction using units of time both in minutes and seconds.
Write the formulas for the following coordination compounds:
(i) Tetraamminediaquacobalt (III) chloride
(ii) Potassium tetracyanonickelate(II)
(iii) Tris(ethane-1,2-diamine) chromium(III) chloride
(iv) Amminebromidochloridonitrito-N-platinate(II)
(v) Dichloridobis(ethane-1,2-diamine)platinum(IV) nitrate
(vi) Iron(III) hexacyanoferrate(II)
(i) Write structures of different isomeric amines corresponding to the molecular formula, C4H11N
(ii) Write IUPAC names of all the isomers.
(iii) What type of isomerism is exhibited by different pairs of amines?
Why are solids rigid?
Write any two characteristics of Chemisorption.
Write the structures of the following compounds.
(i) α-Methoxypropionaldehyde
(ii) 3-Hydroxybutanal
(iii) 2-Hydroxycyclopentane carbaldehyde
(iv) 4-Oxopentanal
(v) Di-sec-butyl ketone
(vi) 4-Fluoroacetophenone
Why are pentahalides more covalent than trihalides?
Silver atom has completely filled d orbitals (4d10) in its ground state. How can you say that it is a transition element?
Glucose or sucrose are soluble in water but cyclohexane or benzene (simple six membered ring compounds) are insoluble in water. Explain.
Write structures of the following compounds:
(i) 2-Chloro-3-methylpentane
(ii) 1-Chloro-4-ethylcyclohexane
(iii) 4-tert. Butyl-3-iodoheptane
(iv) 1,4-Dibromobut-2-ene
(v) 1-Bromo-4-sec. butyl-2-methylbenzene
Define the term polymerisation.
How can you prepare Cl2 from HCl and HCl from Cl2? Write reactions only.
Nitrogen exists as diatomic molecule and phosphorus as P4. Why?
Boiling point of water at 750 mm Hg is 99.63°C. How much sucrose is to be added to 500 g of water such that it boils at 100°C.Molal elevation constant for water is 0.52 K kg mol-1.
An organic compound with the molecular formula C9H10O forms 2, 4-DNP derivative, reduces Tollens' reagent and undergoes Cannizzaro reaction. On vigorous oxidation, it gives 1, 2-benzenedicarboxylic acid. Identify the compound.
How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.
Mention the factors that affect the rate of a chemical reaction.
Explain why propanol has higher boiling point than that of the hydrocarbon, butane?
Explain why is ortho nitrophenol more acidic than ortho methoxyphenol?
What is meant by the chelate effect? Give an example.
During the refining of copper why gold, silver and others are present? Plz answer
During the refining of copper why gold, silver and others are present? Plz answer
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