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Oxidation states of the metal in the min...

Oxidation states of the metal in the minerals haematite and magnetite, respectively, are

A

II, III in haematite and III in magnetite

B

II, III in haematite and II in magnetite

C

II in haematite and II,III in magnetite

D

III in haematite and II,III in magnetite

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The correct Answer is:
D
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AAKASH INSTITUTE ENGLISH-MOCK TEST 21-Example
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  4. 10 % sites of catalyst bed have adsorbed by H(2) on Heating H(2) gas i...

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  5. In Bredig's arc method an electric arc is struck between the metal ele...

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  6. The electrical charge on the the colloidal particles is indicated by

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  7. The gold number of protective colloids A,B,C and D are 0.02, 0.002, 10...

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  8. For the coagulation of 40ml of ferric hydroxide sol, 10ml of 0.4 M KCI...

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  9. Which of the following given statements is/are correct? (a) cold crea...

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  11. The factors responsible for the stability of lyophilic sols are

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  12. To stop bleeding from an injury ferric chloride can be applied. Which ...

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  13. Match the items given in column-I with that in column-II column-I (I) ...

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  15. The incorrect statement regarding forth floatation process is

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  16. Which of the following given properties of colloidal particles is its ...

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  17. Match the methods of concentration of ore given in column-I with the d...

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  19. Which of the following statements is/are incorrect? (a) Cassiterite is...

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