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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

Assertion is false but reason is true

B

Assertion is true but reason is false

C

Both assertion and reason are true, but reason is not a true explanation for assertion

D

Both assertion and reason are true and reason is the correct explanation for assertion

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The correct Answer is:
B
Assertion is true but reason is false.
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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]^(-)

ICSE-SAMPLE PAPER 05 (CHEMISTRY)-MULTIPLE CHOICE QUESTIONS
  1. Which of the following will have metal deficiency defect?

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  2. 1-Propanol and 2- propanol can be distinguished by:

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  3. Propanone is obtained by dehydrogenation of:

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  4. Butane nitrile can be prepared by heating

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  5. 1- Chlorobutane on reaction with alcoholic potash gives:

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  6. In the extraction of chlorine by electrolysis of brine

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  7. In the metallurgy of aluminium

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  8. The number of second nearest Na^(+) ion in NaCl structure is:

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  9. What is the coordination number of hcp and ccp?

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  10. Which of the following has regular tetrahedral structure?

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  11. Which of the following forms salt like KHX(2) ?

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  12. Diethyl ether on heating with conc. HI gives two moles of:

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  13. Ethers are quite stable towards:

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  14. Which of the following solutions shows positive deviation from Raoult'...

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  15. The osmotic pressure of a solution can be increased by

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  16. Statement I: p-Nitrophenol is a stronger acid than o-nitrophenol. St...

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  17. Assertion: SN(2), reactions proceed with inversion of configuration. ...

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  18. Statement-1 :Xenon forms fluorides. Statement-2 :5 d-orbitals are av...

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  19. Assertion: HClO(4) is a stronger acid than HClO(3). Reason: Oxidati...

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

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