Question

Which of the following pairs of oxides cannot be reduced by carbon to give the respective metals?   

Solution

Correct option is

CaO, K2O

K and Ca are highly electropositive metals. Moreover, these are highly reactive and have more negative standard reduction potential. Being very reactive, oxides of both of these metals cannot be reduced by carbon. These metals are obtained by electrolytic reduction.

SIMILAR QUESTIONS

Q1

 

Lead is extracted from galena (PbS), either by following ways.  

   

Auto-reduction process is                         

Q2

The chemical process in the production of steel from haematite ore involves

Q3

Which of the following process involves smelting? 

Q4

 

FeCr2O4 (chromite) is a good source of chromium and its compounds like Na2CrO4 and Na2Cr2O7

   

   

    

     

Identify A

Q5

Consider  (CuO) = –129.7 kJ mol–1 kJ mol –1and  The better reducing agent for the reduction of CuO is

Q6

In which of the following isolations no reducting agent is required?

Q7

Titanium containing mineral found in our country is 

Q8

Ore pitch blende is main source of 

Q9

Metal which can be extracted from all the three dolomite, magnesite and carnallite is

Q10

Chile salt petre is an ore of