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
Write the monomers used for getting the following polymers. (i) Polyvinyl chloride (ii) Teflon (iii) Bakelite
Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law, with t1/2 = 3.00 hours. What fraction of sample of sucrose remains after 8 hours?
Calculate the mass of a non-volatile solute (molar mass 40 g mol-1) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%.
List the uses of Neon and argon gases.
What are polymers?
The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table:
Experiment |
A/ mol L - 1 |
B/ mol L - 1 |
Initial rate/mol L - 1 min - 1 |
I | 0.1 | 0.1 |
2.0 × 10 - 2 |
II | -- | 0.2 |
4.0 × 10 - 2 |
III | 0.4 | 0.4 | -- |
IV | -- | 0.2 |
2.0 × 10 - 2 |
How can you prepare Cl2 from HCl and HCl from Cl2? Write reactions only.
The rate constant for a first order reaction is 60 s-1. How much time will it take to reduce the initial concentration of the reactant to its 1/16th value?
Write the structures of products of the following reactions;
(i)
(ii)
(iii)
(iv)
Identify allylic alcohols in the above examples.
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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