Q. No.The calculated spin-only magnetic moment of Cr2+ ion is:
1.
4.90 BM
2.
5.92 BM
3.
2.84 BM
4.
3.87 BM
Identify the incorrect statement.
| 1. | The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes. |
| 2. | Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals. |
| 3. | The oxidation states of chromium in CrO42– and Cr2O72– are not the same. |
| 4. | Cr2+(d4) is a stronger reducing agent than Fe2+(d6) in water. |
Urea reacts with water to form A which will decompose to form B. B when passed through \(\left(Cu\right)^{2 +}\) (aq), deep blue colour solution C is formed. What is the formula of C from the following?
| 1. | \(\left[Cu \left(NH_{3}\right)_{4}\right]^{2 +}\) | 2. | \(Cu \left(\right. OH \left.\right)_{2}\) |
| 3. | \(CuCO_{3} . Cu (OH)_{2}\) | 4. | \(CuSO_{4}\) |
Identify the incorrect statement from the following:
| 1. | Zirconium and Hafnium have identical radii of 160 pm and 159 pm, respectively as a consequence of lanthanoid contraction. |
| 2. | Lanthanoids reveal only +3 oxidation state. |
| 3. | The lanthanoid ions other than the f0 type and the f14 type are all paramagnetic. |
| 4. | The overall decrease in atomic and ionic radii from lanthanum to lutetium is called lanthanoid contraction. |
Match the following aspects with the respective metal:
| Aspects | Metal | ||
| (a) | The metal that reveals the maximum number of oxidation states | (i) | Scandium |
| (b) | The metal, although placed in a 3d block, is not considered a transition element | (ii) | Copper |
| (c) | The metal that does not exhibit variable oxidation states | (iii) | Manganese |
| (d) | The metal, which is in +1 oxidation state in aqueous solution, undergoes disproportionation | (iv) | Zinc |
Select the correct option:
| Options: | (a) | (b) | (c) | (d) |
| 1. | (i) | (iv) | (ii) | (iii) |
| 2. | (iii) | (iv) | (i) | (ii) |
| 3. | (iii) | (i) | (iv) | (ii) |
| 4. | (ii) | (iv) | (i) | (iii) |
When neutral or faintly alkaline is treated with potassium iodide, iodide ion is converted into 'X'. 'X' is:
1.
2.
3.
4.
Match the catalyst with the process:
| Catalyst | Process | ||
| (i) | \(V_2O_5\) | (a) | The oxidation of ethylene to ethanal |
| (ii) | \(TiCl_4 + Al(CH_3)_3\) | (b) | Polymerisation of alkynes |
| (iii) | \(PdCl_2\) | (c) | Oxidation of \(SO_2\) in the manufacture of \(H_2SO_4\) |
| (iv) | Nickel complexes | (d) | Polymerisation of ethylene |
Which of the following is the correct matching of Catalyst & Process?
| Options: | (i) | (ii) | (iii) | (iv) |
| 1. | c | d | a | b |
| 2. | a | b | c | d |
| 3. | a | c | b | d |
| 4. | c | a | d | b |
1. (i)-(c), (ii)-(d), (iii)-(a), (iv)-(b)
2. (i)-(a), (ii)-(b), (iii)-(c), (iv)-(d)
3. (i)-(a), (ii)-(n), (iii)-(b), (iv)-(d)
4. (i)-(c), (ii)-(a), (iii)-(d), (iv)-(b)
Which one of the following ions is the most stable in an aqueous solution?
(At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)
1. \(\text{Cr}^{3 +}\)
2. \(\text V^{3 +}\)
3. \(\text{Ti}^{3 +}\)
4. \(\text{Mn}^{3 +}\)
Identify the incorrect statement among the following:
| 1. | There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu. |
| 2. | Lanthanoid contraction is the accumulation of successive shrinkages |
| 3. | As a result of lanthanoid contraction, the properties of the 4d series of the transition elements have no similarities with the 5d series of elements |
| 4. | The shielding power of 4f electrons is quite weak. |
Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?
1. 3d3, 4s2
2. 3d5, 4s1
3. 3d5, 4s2
4. 3d2, 4s2
© 2026 GoodEd Technologies Pvt. Ltd.