Oxidation and Reduction

21.When a copper bar is dipped in aqueous silver nitrate solution, its color changes to blue because
 
A. Copper is more easily reduced than silver
 
B. Copper is more easily oxidised than silver
 
C. Nitrate ion acts as an oxidizing agent
 
D. Nitrate ion acts as a reductant
 
Option”B” is correct
22.Oxidizer is a substance which
 
A. Increases the oxidation number of the parent element in a given substance
 
B. Decreases the oxidation number of the parent element in a given substance
 
C. itself is oxidized in a metabolic reaction
 
D. loses electrons in a redox reaction
 
Option”A” is correct
23.In oxidation (oxidation) – 1. Hydrogen is displaced from a substance. 2. When a positive element is added to a substance or the proportion of positive and negative elements increases, select the correct answer using the code given below –
 
A. only 1
 
B. only 2
 
C. both 1 and 2
 
D. neither 1 nor 2
 
Option”A” is correct
24.Which of the following statements regarding oxidation and reduction are correct? 1. There is a loss of electrons in oxidation, whereas there is a loss of electrons in reduction. 2. There is a gain of electrons in oxidation, while there is a loss of electrons in reduction. 3. Oxidizing agent lowers the selection number, but reducing agent increases the selection number. 4. Oxidizing agent increases the selection point, but reduces the reducing agent. Select the correct answer using the code given below –
 
A. 1 and 3
 
B. 2 and 4
 
C. 2 and 3
 
D. 1 and 4
 
Option”D” is correct
25.Which of the following is the most powerful oxidizing agent?
 
A. oxygen
 
B. chlorine
 
C. fluorine
 
D. iodine
 
Option”C” is correct
26.In the reaction ZnO + C → Zn + CO ‘C’ acts as which one of the following?
 
A. acid
 
B. Salt
 
C. Vice President
 
D. reducing agent
 
Option”D” is correct
27.Oxidation is a reaction in which
 
A. electrons are lost
 
B. oxygen combines
 
C. There is an increase in the proportion of electropositive groups
 
D. All of the above
 
Option”D” is correct
28.Reduction is a reaction in which
 
A. electrons are lost
 
B. oxygen combines
 
C. There is an increase in the proportion of electropositive groups
 
D. All of the above
 
Option”D” is correct
29.The tendency to lose electrons is called
 
A. oxidation
 
B. degradation
 
C. triggering
 
D. motivation
 
Option”A” is correct
30.The tendency to accept electrons is called
 
A. oxidation
 
B. degradation
 
C. triggering
 
D. motivation
 
Option”B” is correct

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