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Three most occurring elements into the e...

Three most occurring elements into the earth crust are :

A

O, Si, Al

B

Si, O, Fe

C

Fe, Ca, Al

D

Si, O, N

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The correct Answer is:
A
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VK JAISWAL-METALLURGY-ASSERTION-REASON TYPE QUESTIONS
  1. Three most occurring elements into the earth crust are :

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  2. Assertion : PbSiF(6)+H(2)SiF(6)+ gelatine is taken as electrolyte in e...

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  3. Assertion : Nitriding is the process of heating steel in presence of N...

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  4. Assertion : Ores are generally converted into oxides, prior to reducti...

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  5. Assertion : In the extraction of Ag, complex Na[Ag(CN)(2)] is reacted ...

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  6. Statement-I : Thermite mixture Fe(2)O(3) +Al (powder) is used in the w...

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  7. Assertion : In froth floatation process sodium ethyl xanthate is used ...

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  8. Assertion : Cryolite is used in electrolytic extraction of Al from alu...

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  9. Statement-I : CuFeS(2) is concentrated by froath floatation method S...

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  10. Assertion : In the electrolytic reduction of Al(2)O(3), cryolite is us...

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  11. Assertion : Wrought iron is more malleable and ductile than steel. R...

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  12. Assertion : Lead, tin and bismuth are purified by liquation method. ...

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  13. Assertion : Al(2)O(3) is converted into Al by reduction with carbon at...

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  14. Assertion : Reduction of ZnO with carbon is done at 1100^(@)C. Reaso...

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  15. Assertion : Desilverisation of lead is done by Parke's method DeltaG. ...

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  16. Statement-I : All the ores are mineral Statement-II : Most of the or...

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  17. Assertion : PbSiF(6)+H(2)SiF(6)+ gelatine is taken as electrolyte in e...

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  18. Assertion : Nitriding is the process of heating steel in presence of N...

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  19. Assertion : Ores are generally converted into oxides, prior to reducti...

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  20. Assertion : In the extraction of Ag, complex Na[Ag(CN)(2)] is reacted ...

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  21. Assertion : Thermite mixture Fe(2)O(3)+ Al (powder) is used in the wel...

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