Redox

Redox

10th Grade

7 Qs

quiz-placeholder

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Assessment

Quiz

Physics

10th Grade

Practice Problem

Medium

Created by

Huang Zhijie

Used 2+ times

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7 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Hydrogen peroxide, H2O2, reacts with an oxide M2O according to the following reaction:

M2O (s) + H2O2 (aq) --> 2M(s) + H2O (l) + O2(g)

M2O is acting as oxidising agent

M2O is acting as catalyst

H2O2 is acting as oxidising agent

H2O2 is reduced to H2O2 by the removal of oxygen.

Answer explanation

count the oxidation states!

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In which of the following conversions does the oxidation state of nitrogen show the largest increase?

Ammonia to nitrogen gas

ammonia to ammonium ion

Nitrogen dioxide to nitric acid

nitrogen monoxide to nitrogen dioxide

Answer explanation

be mindful of the overall charge in nitrate ion when calculating the oxidation state of nitrogen.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When potassium manganate (VII) is added to substance X, the solution changes from purple to colourless. What is X?

oxidising agen

reducing agent

Answer explanation

what is the color of potassium manganate(VII) and what does it do?

See TB page 212

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Colorless potassium iodide is added to colourless solution Y. The solution turns brown.

Which of the following best describe the reaction?

Potassium iodide oxidises Y to brown color

Potassium iodide reduces Y to brown color

Y oxidises potassium iodide to brown Iodine solution

Y reduces potassium iodide to brown solution

Answer explanation

see TB page 211

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following underline substance has the highest oxidation state?

NO2

SO3

KMnO4

KClO3

Answer explanation

highest = most positive

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

X2O (s) + H2O2 (aq) --> 2X(s) + H2O (l) + O2(g)

Which substance is the reducing agent?

X2O

H2O2

X

H2O

Answer explanation

reducing agents undergo _____ ?

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

2Fe (s) + 2KMnO4 (aq) → Fe2O3 (s) + 2MnO2 (s) + K2O (aq)

which substance is the oxidising agent?

Fe

KMnO4

Fe2O3

K2O

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