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Which of the following is used in thermi...

Which of the following is used in thermine welding ?

A

`TiO_2` + 4Na `rArr` Ti + `2Na_(2)O`

B

2Al + `Fe_(2)O_3` `rArr` `Al_(2)O_3` + 2Fe

C

`SnO_2` + 2C `rArr` Sn + 2CO

D

`Cr_(2)O_3 + 2Al to Al_(2)O_(3) + 2Cr`

Text Solution

Verified by Experts

The correct Answer is:
B
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DINESH PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-REVISION QUESTIONS FROM COMPETITIVE EXAMS.
  1. The auto reduction process is not used in the metallurgy of

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  2. The incorrect statement among the following is

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  3. Which of the following is used in thermine welding ?

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  4. Which of the following methods is used for obtaining Aluminium metal ?

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  5. According to Ellinigliam diagram, the oxidation reaction of carbon to ...

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  6. In the equation , 4M + 8CN^(-) + 2H(2)O + O rarr 4[M(CN)2]^(-) + 4OH^(...

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  7. Oxidation states of the metal in the mineral haematite and magnetite ,...

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  8. Which of the following does not occur as sulphide ore. ?

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  9. Calamine is an ore of

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  10. Bauxite has composition

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  11. Which of the following statements is false ?

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  12. In view of the sign of delta(n)G^(o) for the following reaction : Pb...

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  13. The following reactions take place in the blast furnace in the prepara...

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  14. Which of the following elements is present as the impurity to the maxi...

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  15. Which of the following pairs of metals is purified by Van Arkel method...

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  16. Heating mixture of Cu(2)Oand Cu(2)S will give

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  17. During electrolytic refining of copper some metals , present as impuri...

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  18. Aluminium is extracted from Alumina (Al(2)O3 ) by electrolysis of a mo...

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  19. In the extraction of copper from its sulphide ore, the metal is finall...

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  20. Which method of purification is represented by the following equation ...

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