Redox Reactions - Online Test

Answer : Option D
Explaination / Solution:

Oxygen is the most electronegative element. Oxygen have 6 electrons in its outermost shell and to gain noble gas configuration oxygen have to take 2 more electrons.

Answer : Option C
Explaination / Solution:

The roman number represents the oxidation number/oxidation state of an element.It is popularly known as Stock notation given by the german scientist Alfred stock.

Answer : Option A
Explaination / Solution:

Color in complex arises due to the presence of unpaired electrons in the system when complex reaction takes place.

Answer : Option B
Explaination / Solution:

A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product). Such reactions may be represented by equations of the following form: X + Y → XY.

Answer : Option A
Explaination / Solution:

X=-1.2V , Y=+0.5V , Z=-3.0V Therefore, Z>X>Y Because, higher the reduction potential ,lesser the reducing power.

Answer : Option B
Explaination / Solution:

Reducing agent is one in which element undergo oxidation itself and make the other substance reduce.

Answer : Option D
Explaination / Solution:

A common characteristic of most Alkali metal is their ability to displace H2 (g) from water. This is represented by their large, negative electrode potentials. In this event, the Group 1 metal is oxidized to its metal ion and water is reduced to form hydrogen gas and hydroxide ions. The general reaction of an alkali metal (M) with H2O (l) is given in the following equation:

2M(s)+2H2O(l)⟶2M+(aq)+2OH−(aq)+H2(g)

From this reaction it is apparent that OH- is produced, creating a basic or alkaline environment. Group 1 elements are called alkali metals because of their ability to displace H2 (g) from water and create a basic solution.Alkali metals are also known to react violently and explosively with water. This is because enough heat is given off during the exothermic reaction to ignite the H2(g)

Answer : Option C
Explaination / Solution:

Because a redox indicator (also called an oxidation-reduction indicator) is an indicator which undergoes a definite color change at a specific electrode potential.

Answer : Option B
Explaination / Solution:

The concept of redox reaction is used in electrode processes and cells. Because in these processes an electrode loose or gain electrons, electrode with higher reduction potential undergo reduction, electrode potential is given a positive sign if oxidation occures at the electrode.

Answer : Option B
Explaination / Solution:

This is redox couple.

Where following reaction take place :

Zn2+  + 2e-  → Zn