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Which of following metal oxide (s) can b...

Which of following metal oxide (s) can be reduced to the corresponding metal by hydrogen
a) `M o O_(3)` b) `WO_(3)` c) `Fe_(2)O_(3)` d) ZnO
The correct match is

A

only a and b

B

a, b and d

C

a and c

D

a only

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-PRINCIPLES OF METALLURGY-Objective exercise -2 (Extraction of some metals)
  1. Sodium connot be extracted by electrolysis of aqueous solutions due to

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  2. Silver can be precipitated in hydrometallurgy by using aluminium. Thi...

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  3. Which of following metal oxide (s) can be reduced to the corresponding...

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  4. Formation of metallic copper from the sulphide ore in the normal therm...

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  5. A mixture of Al(2) O(3) and Fe(2) O(3) can be separa-ted by using

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  6. Percentages of copper and zinc present in a alloy brass, are respectiv...

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  7. In the blast furnace, the reaction that is taking place at the tempera...

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  8. Metal used in the extraction of Mn and Cr from their oxides is

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  9. Impurity present in red bauxite is

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  10. Metal extracted from molten cryolite is

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  11. From the below Ellingham diagram, incorrect statement among the follo...

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  12. Metal extracted only by electrolysis process is

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  13. Heating mixture of Cu(2) O and Cu(2) S will give

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  14. Metal that can be extracted by eletrolysis of its salt even from aqueo...

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  15. The final step in the metallurgical extraction of Cu metal from Cu pyr...

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  16. The process of bringing the metal or its ore into solution by the acti...

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  17. Exothermic reaction among the following is A) Cr(2) O(3) + 2All to...

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  18. In the extraction of silver from argentite are the one is treated with...

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  19. Which of the following reagent is used to separate the impurity from r...

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  20. The metal iron obtained for the last furnace contains X' percent of ca...

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