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Pyrolusite is...

Pyrolusite is

A

Carbonate ore

B

Sulphur ore

C

silicon ore

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
D
Pyrolusite or Manganese dioxide `(MnO_(2))` is a mineral of maganese.
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Pyrolusite ore is :

Oh heating pyrolusite with KOH in presence of air we get

8.7gm of pyrolusite (impure MmO_(2) ) were heated with concentrated HCl. The Cl_(2) gas evolved was passed through excess of KI solution. The iodine gas evolved required 80ml of (N)/(10) hypo solution. The precentage of MnO_(2) in pyrolusite will be : [Mn=55]

Chlorine evolved by the reaction of 45.31g of pyrolusite (impure) and excess of HCl is found to combine completely with the hydrogen produced by the reaction of 10g of magnesium and excess of dilute hydrochloric acid. Find the percentrage of purity of MnO_(2) in the given pyrolusite.

How will you obtain pure potassiu permanganate (KMnO_(4)) crystals from its ore pyrolusite? Give the steps involved in the reactions. .

ERRORLESS -S AND P BLOCK ELEMENTS-Ordinary thinking (Alkali metals)
  1. Choose the incorrect statement in the following

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  2. Which of the following alkali metals has the biggest tendency of the h...

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  3. Pyrolusite is

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  4. An inorganic compound first metls then resolidifies and then liberates...

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  5. Which of the following does not participate in the solvay's process f...

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  6. Sodium metal is extracted by

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  7. Which physical property in the alkali metal group increases with atomi...

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  8. Sodium carbonate reacts with SO(2) in aqueous medium to give

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  9. When CO is passed over solid NaOH heated to 200^(@)C , it forms

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  10. As compared to potassium ,sodium has .

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  11. Na(2)CO(3) can be manufactured by Solva's process but K(2)CO(3) cannot...

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  12. Which of the following is the smallest cation?

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  13. In the manufacture of metallic sodium by the fused salt electrolysis (...

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  14. The reactivity of the alkali metal sodium with water, is made use of

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  15. With the increase in atomic weights,melting points of the alkali metal...

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  16. Alkali metals are

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  17. Certain characteristics lithium differ from those of other alkali meta...

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  18. Characterstic feature of alkali metals is

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  19. The correct formula of hypo is

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  20. Which of the following gases turns the acdified potassium dischromate ...

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