- 1(current)
Q. No.The oxidation states of iron atoms in compounds (A), (B) and (C), respectively, are x, y and z. The sum of x, y and z is________.
Na4[Fe(CN)5NOS] Na4[FeO4] [Fe2(CO)9]
(A) (B) (C)
1. 4
2. 5
3. 6
4. 7
The oxidation states of transition metal atoms in K2Cr2O7, KMnO4 and K2FeO4, respectively, are x, y and z.
The sum of x, y and z is-
1. 16
2. 12
3. 19
4. 22
Which of the following reactions is an example of a redox reaction?
1. \(XeF_6+H_2O~\longrightarrow~XeOF_4+2HF\)
2. \(XeF_6+2H_2O~\longrightarrow~XeO_2F_2+4HF\)
3. \(XeF_4+O_2F_2~\longrightarrow~XeF_6+O_2\)
4. \(XeF_2+PF_5~\longrightarrow~[XeF]^{+1}+PF_6~^-\)
What is the oxidation number of Cl in \(\text{CaOCl}_2\) (bleaching powder)?
1. Zero, because it contains Cl2
2. -1, because it contains Cl-
3. +1, because it contains ClO-
4. +1 and -1 because it contains ClO- and Cl-
| 1. | \(\text{BrO}^-\) | 2. | \(\text{BrO}^-_4\) |
| 3. | \(\text{BrO}^-_3\) | 4. | \(\text{BrO}^-_2\) |
| List-I (Redox Reaction) |
List-II (Type of Redox Reaction) |
||
| (A) | \(\mathrm{CH}_{4(\mathrm{~g})}+2 \mathrm{O}_{2(\mathrm{~g})}\) \(\xrightarrow{\Delta} \mathrm{CO}_{2(\mathrm{~g})}+\) \(2 \mathrm{H}_2 \mathrm{O}_{(1)}\) | (I) | Disproportionation reaction |
| (B) | \(2 \mathrm{NaH}_{(\mathrm{s})} \xrightarrow{\Delta}\) \(2 \mathrm{Na}_{(\mathrm{s})}+\mathrm{H}_{2(\mathrm{~g})}\) | (II) | Combination reaction |
| (C) | \(\mathrm{V}_2 \mathrm{O}_{5(\mathrm{~s})}+5 \mathrm{Ca}_{(\mathrm{s})}\) \(\xrightarrow{\Delta} 2 \mathrm{~V}_{(\mathrm{s})} ~+\) \(5 \mathrm{CaO}_{(\mathrm{s}}\) | (III) | Decomposition reaction |
| (D) | \(2 \mathrm{H}_2 \mathrm{O}_{2(\mathrm{aq})} \xrightarrow{\Delta}\) \(2 \mathrm{H}_2 \mathrm{O}_{(1)}+\mathrm{O}_{2(\mathrm{~g})}\) | (IV) | Displacement reaction |
Choose the correct answer from the options given below :
1. A-II, B-III, C-IV, D-I
2. A-II, B-III, C-I, D-IV
3. A-III, B-IV, C-I, D-II
4. A-IV, B-I, C-II, D-III
- 1(current)
Q. No.
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