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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

The mixture of compounds A and B is passed through a column of AlX2OX3 by using alcohol as eluant. Compound A is eluted in preference to compound B. Which of the compounds A or B, is more readil

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प्रश्न

The mixture of compounds A and B is passed through a column of \[\ce{Al2O3}\] by using alcohol as eluant. Compound A is eluted in preference to compound B. Which of the compounds A or B, is more readily adsorbed on the column?

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उत्तर

Compound A doesn’t adsorb on the column well and moves down the column with alcohol (eluant), while compound B gets adsorbed well on the column and cannot move down.

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पाठ 6: General Principle and Processes of Isolation of Elements - Multiple Choice Questions (Type - I) [पृष्ठ ८३]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
पाठ 6 General Principle and Processes of Isolation of Elements
Multiple Choice Questions (Type - I) | Q 35 | पृष्ठ ८३

संबंधित प्रश्‍न

The reaction,

Cr2O3 + 2Al → Al2O3 + 2Cr

 (ΔGθ = -421kJ) is thermodynamically feasible as is apparent from the Gibbs energy value.  Why does it not take place at room temperature?


Is it true that under certain conditions, Mg can reduce SiO2 and Si can reduce MgO? What are those conditions?


Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?


Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.


Write chemical reactions taking place in the extraction of zinc from zinc blende.


State the role of silica in the metallurgy of copper.


Write chemical reactions taking place in the extraction of copper from Cu2 S. 


In the metallurgy of aluminium ______.


For the metallurgical process of which of the ores calcined ore can be reduced by carbon?

(i) Haematite

(ii) Calamine

(iii) Iron pyrites

(iv) Sphalerite


Why is sulphide ore of copper heated in a furnace after mixing with silica?


Explain the following:

\[\ce{CO2}\] is a better reducing agent below 710 K whereas \[\ce{CO}\] is a better reducing agent above 710 K.


Explain the following:

Generally sulphide ores are converted into oxides before reduction.


Explain the following:

Silica is added to the sulphide ore of copper in the reverberatory furnace.


Explain the following:

Carbon and hydrogen are not used as reducing agents at high temperatures.


A cuprous ore among the following is:-


Carbon deposition reaction taking place in ______.


\[\ce{Au + CN^- + H2O + O2 -> [Au(CN)2]^- + OH^-}\]

The number of CN ions involved in the balanced equation is ______.


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