Q. No.Urea reacts with water to form A which will decompose to form B. B when passed through \(\left(Cu\right)^{2 +}\) (aq), deep blue color 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.
| 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. |
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 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 which reveals the maximum number of oxidation states | (i) | Scandium |
| (b) | The metal although placed in a 3d block is not considered as a transition element | (ii) | Copper |
| (c) | The metal which does not exhibit variable oxidation states | (iii) | Manganese |
| (d) | The metal which 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)
The catalytic activity of transition metals and their compounds is ascribed mainly to:
1. their unfilled d-orbitals
2. their ability to adopt variable oxidation states
3. their chemical reactivity
4. their magnetic behaviour
Which one of the following does not correctly represent the correct order of the property indicated against it?
| 1. | Ti3+< V3+< Cr3+< Mn3+: increasing magnetic moment |
| 2. | Ti < V < Cr < Mn : increasing melting point |
| 3. | Ti < V < Mn < Cr : increasing 2nd ionization enthalpy |
| 4. | Ti < V < Cr < Mn : increasing number of oxidation states |
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