36 Questions
What is the oxidation number of a single monatomic ion?
Equal to the charge on the ion
Which of the following is an example of a reduction process?
C2H4(g) + H2(g) → C2H6(g)
What is the oxidation number of hydrogen in H2O?
+1
What is the oxidation number of oxygen in O2?
0
Which of the following is an example of an oxidation reaction?
2Mg(s) + O2(g) → 2MgO(s)
What is the oxidation number of sodium in Na2O?
+1
What is the average oxidation number of carbon atoms in carbon suboxide?
4/3
What is the oxidation number of manganese in MnO4-?
+7
What is the oxidation number of hydrogen in H2O?
+1
What is the oxidation number of iodine in I2?
0
What is the oxidation number of sulphur in the tetrathionate ion (S4O6)2-?
+2.5
What is the type of reaction that involves the change in oxidation state of an element from two different oxidation states to the same oxidation state?
Comproportionation
What is the oxidation number of fluorine in its compounds?
-1
What is the sum of oxidation numbers of all atoms in a neutral compound?
Zero
What is the oxidation number of oxygen in most of its compounds?
-2
What is the oxidation number of hydrogen in metal hydrides?
-1
What is the oxidation number of chlorine in HClO₄?
+5
What is the oxidation number of oxygen in superoxides?
-1/2
What is the primary purpose of using a double indicator in a titration reaction?
To identify the completion of multiple reactions
In a double indicator titration, what is the significance of the pH range of the indicators?
It determines the range of pH change at the equivalence point
In a double indicator titration, what is the significance of the methyl orange indicator?
It indicates the completion of the second reaction
In a double indicator titration, what is the significance of the phenolphthalein indicator?
It indicates the completion of the first reaction
In a double indicator titration, what is the formula to calculate the number of milliequivalents of HCl?
m.eq.of HCl = m.eq.of NaOH + m.eq.of Na2CO3 + meq.of NaHCO3
What is the primary purpose of iodometric titration?
To determine the concentration of an oxidizing agent
What is the purpose of adding an excess of the intermediate reactant in a back titration?
To allow for the determination of the purity of the analyte
What is the formula used to calculate the normality of the intermediate reactant?
N1V1 = N2V2
What is the significance of the equivalence point in a back titration?
It is the point where the analyte is completely reacted
What is the purpose of titrating the resulting solution with a known volume and concentration of titrant?
To determine the excess volume of the intermediate reactant
What is the calculation used to determine the mass of the analyte?
m.eq.of analyte = Total m.eq.of intermediate reactant - m.eq.of excess intermediate reactant
What is the result of the back titration in the given example?
The chalk contains 0.25 gm of impurities
At the equivalence point, what is the relationship between the normality of the analyte and the titrant?
N1V1 = N2V2
What is the purpose of adding H2SO4 in a titration using potassium permanganate?
To acidify the solution
In a titration using potassium dichromate, what is the role of the diphenylamine indicator?
To indicate the end point of the reaction
What is the difference between the oxidizing power of potassium permanganate and potassium dichromate?
KMnO4 is a stronger oxidizing agent than K2Cr2O7
What is the purpose of titration in determining the purity of a substance?
To determine the amount of impurities in the substance
What is the significance of the equivalence point in a titration reaction?
It is the point at which the number of equivalents of the analyte reacts with the number of equivalents of the titrant
Test your understanding of redox reactions with this quiz covering the classical concepts of oxidation and reduction, including addition and removal of oxygen, hydrogen, and electrons. Practice identifying oxidation and reduction reactions with examples of chemical equations.
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