Which of the following arrangements represents the increasing oxidation number of the central atom?
1.
2.
3.
4.
Match Column I with Column II for the oxidation states of the central atoms.
Column I |
Column II |
||
A. | 1. |
+3 |
|
B. | 2. |
+4 |
|
C. | 3. |
+5 |
|
D. | 4. |
+6 |
|
5. |
+7 |
Codes:
Options: | A | B | C | D |
1. | 4 | 5 | 3 | 1 |
2. | 1 | 2 | 3 | 5 |
3. | 5 | 4 | 3 | 2 |
4. | 4 | 5 | 3 | 2 |
Match the items in Column I with relevant items in Column II.
Column I |
Column II |
||
A. |
Ions having a positive charge |
1. |
+7 |
B. |
The sum of oxidation number of all atoms in a neutral molecule |
2. |
–1 |
C. |
Oxidation number of hydrogen ion. (H+) |
3. |
+1 |
D. |
Oxidation number of fluorine in NaF |
4. |
0 |
E. |
Ions having a negative charge |
5. |
Cation |
6. |
Anion |
Codes:
Options: | A | B | C | D | E |
1. | 5 | 4 | 3 | 2 | 6 |
2. | 1 | 2 | 3 | 5 | 4 |
3. | 5 | 4 | 3 | 2 | 1 |
4. | 4 | 5 | 3 | 2 | 1 |
Assertion (A): | Among halogens, fluorine is the best oxidant. |
Reason (R): | Fluorine is the most electronegative atom. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Given below are two statements:
Assertion (A): | In the reaction between potassium permanganate and potassium iodide, permanganate ions act as an oxidising agent. |
Reason (R): | The oxidation state of manganese changes from +2 to +7 during the reaction. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
In which of the following compounds, an element exhibits two different oxidation state?
1. | 2. | ||
3. | 4. |
The incorrect statement regarding the rule to find the oxidation number among the following is:
1. | The oxidation number of hydrogen is always +1. |
2. | The algebraic sum of all the oxidation numbers carried by elements in a compound is zero. |
3. | An element in its free or uncombined state has an oxidation number of zero. |
4. | Generally, in all its compounds, the oxidation number of fluorine is -1. |
In the reactions given below, thiosulphate reacts differently with iodine than with bromine.
Choose the statements among the following that best describe the above dual behaviour of thiosulphate.
1. | Bromine is a stronger oxidant than iodine. |
2. | Bromine is a weaker oxidant than iodine. |
3. | Thiosulphate undergoes oxidation by bromine and reduction by iodine in these reactions. |
4. | Bromine undergoes oxidation and iodine undergoes reduction in these reactions. |
Using the standard electrode potential, find out the pair between which redox reaction is not feasible.
1. Fe3+ and I-
2. Ag+ and Cu
3. Fe3+ and Cu
4. Ag and Fe3+
values of some redox couples are given below. On the basis of these values choose the correct option.
1. | Cu will reduce Br– | 2. | Cu will reduce Ag |
3. | Cu will reduce I– | 4. | Cu will reduce Br2 |