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 manganate and permanganate ions are tetrahedral, due to:
1. | The π-bonding involves the overlap of d-orbitals of oxygen with d-orbitals of manganese. |
2. | The π-bonding involves the overlap of p-orbitals of oxygen with d-orbitals of manganese. |
3. | Absence of π-bonding. |
4. | The π-bonding involves the overlap of p-orbitals of oxygen with p-orbitals of manganese. |
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 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) |
Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of:
1. | Lanthanoid contraction |
2. | Having similar chemical properties |
3. | Belonging to the same group |
4. | Diagonal relationship |
The incorrect statement among the following is:
1. | Lanthanoids are good conductors of heat and electricity. |
2. | Actinoids are highly reactive metals, especially when finely divided. |
3. | Actinoid contraction is greater for element to element than Lanthanoid contraction. |
4. | Most of the trivalent Lanthanoid ions are colorless in the solid-state. |