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Hallo Mr. Manganese

This document contains a chemistry test on the topic of transition elements, specifically the chemistry of manganese. The test contains multiple choice and written response questions about the electronic configuration of manganese, its common oxidation states, why it is a transition element and has variable oxidation states. Additional questions cover the reactions of various manganese compounds when heated, and reactions of manganese with acids, air, water and chlorine. Further questions address the reactions of manganate(VI) and permanganate ions, and the use of potassium permanganate in volumetric analysis. The final section involves describing observations and writing equations for reactions between manganese(II) sulfate and various reagents.

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111 views5 pages

Hallo Mr. Manganese

This document contains a chemistry test on the topic of transition elements, specifically the chemistry of manganese. The test contains multiple choice and written response questions about the electronic configuration of manganese, its common oxidation states, why it is a transition element and has variable oxidation states. Additional questions cover the reactions of various manganese compounds when heated, and reactions of manganese with acids, air, water and chlorine. Further questions address the reactions of manganate(VI) and permanganate ions, and the use of potassium permanganate in volumetric analysis. The final section involves describing observations and writing equations for reactions between manganese(II) sulfate and various reagents.

Uploaded by

kimalyo2194
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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CHEMISTRY DEPARTMENT 2023

S.6 BRAINSTORMING TEST


TOPIC; TRANSITION ELEMENTS
SUB-TOPIC; CHEMISTRY OF MANGANESE

NAME………………………………………………………………INDEX number…………..………….

Signature ……………………………………………… STREAM ………………………….


Instructions; Attempt all questions in this paper.

1. (a) Write
(i) The electronic configuration of manganese atom (atomic
number =25) (01 mark)
……………………………………………………………………………………………………………………………………

(ii) The all the possible oxidation states of manganese. (01 mk)
……………………………………………………………………………………………………………………………………….
b) (i) State the most common oxidation states of manganese
……………………………………………………………………………………………………………………………………….
(ii)Which one is the stable state of manganese and why? (01 mark)

……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

(c) Explain why manganese


(i) is a transition element. (01 mark)
……………………………………………………………………………………………………………………………………….

(ii) has variable oxidation states. (01 mark)


……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….
(iii) has a higher melting point than calcium (01 mark)
……………………………………………………………………………………………………………………………………….

KIBUGO
2. (a) Write equations for the reactions when the following are heated
strongly to a constant mass
(i) 𝑀𝑛𝐶𝑂3 (1½ marks)

………………………………………………………………………………………………………………………………….

(ii) Mn(𝑁𝑂3)2 (1½ marks)

……………………………………………………………………………………………………………………………………….

(iii) 𝑀𝑛𝐶2𝑂4 (1½ marks)

……………………………………………………………………………………………………………………………………….
b) Write an equation for the reaction of manganese with

(i) Air (1½ marks)


……………………………………………………………………………………………………………………………………….

(ii) Water (1½ marks)


……………………………………………………………………………………………………………………………………….

(iii) dilute acids (03 marks)


……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

(iv) Concentrated acids. (03 marks)

……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

(v) chlorine (1½ marks)

KIBUGO
3. (a) Write an equation for reaction manganate(vi) in
(i) neutral medium (1½ marks)

……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….
(ii) alkaline medium (1½ marks)
……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….
b) Carbon dioxide was bubbled through potassium manganate(vi) solution
(i) State what was observed. (01 mark)

……………………………………………………………………………………………………………………………………….

(ii) Write an equation for the reaction (1½ marks)

……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

4. (a)(i) Define a primary standard. (01 mark)


……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….
(ii) State two reasons why potassium manganate(vii) is not a good
primary standard. (02 marks)
……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….
b) State two advantages of using potassium manganate(vii) in volumetric
analysis. (02 marks)

……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

KIBUGO
(c) Explain briefly why hydrochloric acid and nitric acid are not used for
Acidifying potassium permanganate solution during volumetric analysis

……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

(d) Write half equations for the reduction of potassium permanganate in


(i) strongly acidic medium (1½ marks)

……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

(ii) strongly alkaline medium (1½ marks)


……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

5. (a) State what would be observed and write the equations for the
reactions when each of the following reagent is treated with an aqueous
solution of manganese(ii) sulphate

(i) lead(IV) oxide in the presence of conc. Nitric acid

Observation
………………………………………………………………………………………………………………………………………

Equation (1½ marks)


……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

KIBUGO
(ii) solid sodium bismuthate and conc. Nitric acid

Observation
………………………………………………………………………………………………………………………………………

Equation (1½ marks)

……………………………………………………………………………………………………………………………………….

(ii) aqueous ammonia solution drowise until in excess

Observation
………………………………………………………………………………………………………………………………………

Equation (1½ marks)


……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

(iii) Sodium hydroxide solution drowise until in excess


Observation
………………………………………………………………………………………………………………………………………

Equation (1½ marks)


……………………………………………………………………………………………………………………………………….

……………………………………………………………………………………………………………………………………….

(iii) hydrogen sulphide gas

Observation
………………………………………………………………………………………………………………………………………

Equation (1½ marks)

……………………………………………………………………………………………………………………………………….

END.

KIBUGO

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