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Assertion (A) Hydrometallurgy involves d...

Assertion (A) Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitating by a more electropositive metal .
Reason ( R) Copper is extracted by hydrometallurgy

A

Both assertion and reason are true and reason is the correct explanation of asserton.

B

Both assertion and reason are true but reason is not the correct explanation of assertion.

C

Assertion is true but reason is false

D

Assertion is flase but reason is true

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Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason : Copper is extracted by hydrometallurgy.

The process of isolation of metals by dissolving the ore in a suitable chemical reagent followed by precipitation of the metal by a more electropositive metal is called

The process of the isolation of a metal by dissolving the ora in a suitable chemical regent followed by precipitaiton of the matal by a more electropositive metal is called:

Hydrometallurgy method is used for the extraction of which of the following metals?

_____involves treating the powdered ore with a suitable reagent which selectively dissolves the ore but not the impurities.

In the stages involved in the extraction of metals in general - give reasons for following Oxide or halides of highly electropositive metals e.g. K, Na, Ca, Al are reduced to metals by electrolysis and not by reduction with coke.

Assertion (A) Toxic metal ions are removed by the chelating ligands. Reason (R) Chelate complexes tend to be more stable.

In the stages involved in the extraction of metals in general - give reasons for following Dressing of the ore is an essential process in the extraction of metal from its ore.

Assertion (A): A is very dilute acidic solution of Cd^(2+) and Ni^(2+) gives yellow precipitate of CdS on passing hydrogen sulphide. Reason (R) : Solubility product of CdS is more than that of NiS .

The IUPAC definition of a transition element is that it is an element that has an incomplete d-subshell in either the neutral atom or its ion. Thus the group 12 elements are member of the d-block but are not transition elements. Chemically solft members of the d-block occurs as sulphide minerals and are partially oxidised to obtain the metal, the more electropositive 'hard' metals occurs as oxides and are extracted by reduction. Opposite to p-block elements, the higher oxidation states are favoured by the heavier elements of d-block Metals on the right of the d-block tend to exist in low oxidation states and form complexes with the ligands. Square-planar complexes are common for the platinum metals and gold in oxidation states that yield d^8 electronic configuration, which include RH(I),Ir(I),Pd(II),Pt(II) and Au(III). The most distinctive features/properties of transition metal complex is their wide range of colours.The crystal field theory attributes the colour of the coordination compounds to d-d transition of the electron.It is important to note that (a) in absence of ligand, crystal field spilling does not occur and hence the substances is colourless, (b) the type of ligand also influences the colour of the complexes. Which of the following has dsp^2 hybridisation and is diamagnetic in nature ? (i) Na_4[Cr(CO)_4] , (ii) [Ni(DMGH)_2] , (iii) [PtHBr(PEt_3)_2] (iv) [As(SCN)_4]^(3-) , (v) [AuBr_4]^(-)

ALLEN-METALLURGY-EXERCISE -04
  1. Why is sulphide ore of copper heated in a furnance after mixing with ...

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  2. Sulphdies ores are converted to oxides before reduction . This is expl...

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  3. Which method is used for refining Zr and Ti ? Explain with equation.

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  4. What should be the considering during the extraction of metal by elect...

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  5. What is the role of flux in metallurgical processes?

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  6. How are metals used as semiconductors refined ? What is the principle ...

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  7. Write down the reaction taking place in blast furnance related to the ...

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  8. Give two requirements for vapour phase refining.

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  9. Write the chemical reactions involved in the process of extraction of ...

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  10. Match the items of column I with items of column II and assign the cor...

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  11. Match the items of Column I with the items of Column II and assign the...

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  12. Match items of Column I with the items of Column II and assign the co...

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  13. Match the items of Column I with the items of Column II and assign t...

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  14. Match the items of Column I with items of Column II and assign the cor...

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  15. Assertion (A) Nickel can be purified by Mond's process. Reason ( R) ...

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  16. Assertion (A) Zirconium can be purified by van Arkel method. Reason...

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  17. Assertion (A) Sulphide ores are concentrated by froth floatation metho...

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  18. Assertion (A) Zone refining method is verty useful for producing semic...

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  19. Assertion (A) Hydrometallurgy involves dissolving the ore in a suitabl...

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  20. Explain the following (a) CO(2) is a better reducing agent below 7...

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