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JEE Exam  >  JEE Tests  >  Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - JEE MCQ

Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - JEE MCQ


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10 Questions MCQ Test - Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August)

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Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 1
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What is the oxidation half reaction of Cu+2 + Zn → Cu + Zn+2?

Detailed Solution for Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 1

Oxidation is the loss of electrons by an atom, ion, or molecule. It is also known as de-electronation. Here in the above-given chemical reaction Cu+2 + Zn → Cu + Zn+2, the oxidation half-reaction is Zn → Zn+2.

Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 2
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When a zinc rod is kept in a copper nitrate solution what happens?

Detailed Solution for Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 2
When zinc is placed in a copper nitrate solution, the intensity of the blue color is produced, and copper iron is deposited on zinc. This is a Redox reaction between zinc and an aqueous solution of copper nitrate occurring in a beaker.
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Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 3
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In this reaction Cu+2 + Zn → Cu + Zn+2, what is an oxidising agent?

Detailed Solution for Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 3

Oxidant or oxidizing agent is a chemical substance that can accept one or more electrons and causes oxidation of some other species. Here, to accept electrons from zinc, so copper is an oxidizing agent.

Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 4
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Loss of electrons is _________________
Detailed Solution for Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 4
Loss of electrons is referred to as oxidation. Oxidizing agent is the acceptor of electrons, and the reducing agent is a donor of electrons, where oxidation is characterized by the loss of electrons by any species, and reduction is the gain of electrons by any species.
Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 5
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Which of the following is true as per the metal activity series?
Detailed Solution for Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 5

Metal activity series or electrochemical series is a series in the decreasing order of metals which are active during a chemical reaction comparatively with each other. Here, Zinc’s activity is greater than Copper’s activity, and Copper’s activity is greater than that of silver.

Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 6
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Intensity of blue color increases gradually when _________________
Detailed Solution for Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 6
When a copper rod is dipped in silver nitrate solution, a redox reaction occurs between Copper and an aqueous solution of silver nitrate. So the intensity of the blue color increases gradually as silver deposits on the rod.
Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 7
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What is a reducing agent of the reaction Cu+2 + Zn → Cu + Zn+2?
Detailed Solution for Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 7

Reductant or reducing agent is a chemical substance which can give one or more electrons and causes reduction of some other species in a chemical reaction. Therefore, zinc is a reducing agent in this reaction.

Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 8
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Which of the following is not an oxidising agent?
Detailed Solution for Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 8
Molecules of the most electronegative elements, compounds having an element in the highest oxidation state, and oxides of metals and nonmetals are examples of oxidizing agents. But sodium hydride is a metallic hydride, so it is not an oxidizing agent.
Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 9
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Hydrogen peroxide is a ______________
Detailed Solution for Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 9

Hydrogen peroxide, which is chemically written as H2O2, is a strong oxidizer as well as a reducer. As it contains two hydrogens and two oxygens, it can easily lose hydrogen or oxygen, i.e., oxidizes and reduces respectively.

Test: Redox Reactions in Terms of Electron Transfer Reactions (12 August) - Question 10
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In the reaction between potassium permanganate (KMnO4) and hydrogen peroxide (H2O2) in an acidic medium, which element undergoes oxidation?
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