Q. No.Europium (Eu) and Terbium (Tb) attain stable 4f configuration by exhibiting oxidation states of
1. +2 and +4
2. +3 and +4
3. +2 and +3
4. +1 and +3
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
Four statements for Cr and Mn are given below:
| (I) | Cr2+ and Mn3+ have the same electronic configuration. |
| (II) | Cr2+ is a reducing agent while Mn3+ is an oxidizing agent. |
| (III) | Cr2+ is an oxidizing agent while Mn3+ is a reducing agent. |
| (IV) | Both Cr and Mn are oxidizing agents. |
The correct statements are
1. (I), (III),(IV)
2. (I) , (II)
3. (I), (II) and (IV)
4. (I), (IV)
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
Silver nitrate solution when added to a colourless aqueous solution E forms a white precipitate which dissolves in excess of E. If the white precipitate is heated with water, it turns black and the supernatant solution gives a white precipitate with acidified barium nitrate solution. Therefore, E is
1. Na2S
2. Na2S2O3
3. Na2SO3
4. Na2SO4
Cyanide ion is a very good complexing agent and also functions as a reducing agent. Hence may cyanide complexes of metals are known. Addition of an aqueous solution of KCN to a solution of copper sulphate yields a white precipitate which is soluble in excess of aqueous KCN to form the complex
1. [Cu(CN)4]1-
2. [Cu(CN)4]2-
3. [Cu(CN)4]3-
4. [Cu(CN)4]4-
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d5 .What is its atomic number?
1. 25
2. 26
3. 27
4. 24
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
The electronic configuration of Cu(II) is 3d9 whereas that of Cu(I) is 3d10. Which of the following is correct?
1. Cu(II) aq is more stable
2. Cu(II) aq is less stable
3. Cu(I) aq and Cu(II) aq are equally stable
4. Stability of Cu(I) aq and Cu(II) aq depends on nature of copper salts
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid state?
1. Ag2SO4
2. CuF2
3. ZnF2
4. Cu2Cl2
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
On addition of small amount of KMnO4 to concentrated H2SO4, a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following.
1. Mn2O7
2. MnO2
3. MnSO4
4. Mn2O3
The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition element, which shows highest magnetic moment.
1. 3d7
2. 3d5
3. 3d8
4. 3d2
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 20 chapters you need to be enrolled in MasterClass Course.
© 2024 GoodEd Technologies Pvt. Ltd.