Which molecule has a Lewis structure that does not obey the octet rule?
1. \( \mathrm{NO}\)
2. \(\mathrm{CS}_2\)
3. \(\mathrm{PF}_3\)
4. \(\mathrm{HCN}\)
1. \( \mathrm{NO}\)
2. \(\mathrm{CS}_2\)
3. \(\mathrm{PF}_3\)
4. \(\mathrm{HCN}\)
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
60%
Level 2: 60%+
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Gadolinium has a low value of third ionisation enthalpy because of:
| 1. | High basic character | 2. | Small size |
| 3. | High exchange enthalpy | 4. | High electronegativity |
Subtopic: f-Block Elements- Properties & Uses |
71%
Level 2: 60%+
NEET - 2022
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The standard cell potential (in volts) of the following electrochemical cell is:
\(\mathrm{{Fe}^{2+}({aq})+{Ag}^{+}({aq}) → {Fe}^{3+}({aq})+{Ag}({s})}\)
( \(\mathrm{{E}_{{Ag}^{+} / {Ag}}^0=x {~V} ; {E}_{{Fe}^{2+} / {Fe}}^0=y {~V} ; {E}_{{Fe}^{3+} / {Fe}}^0=z {~V}}\) )
\(\mathrm{{Fe}^{2+}({aq})+{Ag}^{+}({aq}) → {Fe}^{3+}({aq})+{Ag}({s})}\)
( \(\mathrm{{E}_{{Ag}^{+} / {Ag}}^0=x {~V} ; {E}_{{Fe}^{2+} / {Fe}}^0=y {~V} ; {E}_{{Fe}^{3+} / {Fe}}^0=z {~V}}\) )
| 1. | \(x-z\) |
| 2. | \(x-y\) |
| 3. | \(x +2y-3z\) |
| 4. | \(x+y-z\) |
Subtopic: Electrolytic & Electrochemical Cell |
55%
Level 3: 35%-60%
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The octahedral complex of a metal ion \(M^{3+}\) with four monodentate ligands \(L_1,~L_2, ~L_3\) and \(L_4\) absorbs wavelengths in the region of red, green, yellow, and blue, respectively. The increasing order of ligand strength of the four ligands is:
1. \(L_4<L_3<L_2<L_1\)
2. \(L_1<L_3<L_2<L_4\)
3. \(L_3<L_2<L_4<L_1\)
4. \(L_1<L_2<L_4<L_3\)
1. \(L_4<L_3<L_2<L_1\)
2. \(L_1<L_3<L_2<L_4\)
3. \(L_3<L_2<L_4<L_1\)
4. \(L_1<L_2<L_4<L_3\)
Subtopic: VBT, CFT & their Limitations |
72%
Level 2: 60%+
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The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Purification of Organic Compounds |
67%
Level 2: 60%+
NEET - 2022
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Which of the following statements is correct regarding the structure and properties of diamond and graphite?
| 1. | Both diamond and graphite are used as dry lubricants. |
| 2. | Diamond and graphite have a two-dimensional network. |
| 3. | Diamond is covalent, and graphite is ionic. |
| 4. | Diamond is sp³ hybridised, and graphite is sp² hybridized. |
Subtopic: Structure & Properties of Allotropes of C |
83%
Level 1: 80%+
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The IUPAC name of the following complex is:
[Ag(H₂O)₂][Ag(CN)₂]
1. Diaquasilver(I) dicyanidoargentate (I)
2. Dicyanidosilver(II) diaquaargentate(II)
3. Diaquasilver(II) dicyanidoargentate(II)
4. Dicyanidosilver(I) diaquaargentate(I)
[Ag(H₂O)₂][Ag(CN)₂]
1. Diaquasilver(I) dicyanidoargentate (I)
2. Dicyanidosilver(II) diaquaargentate(II)
3. Diaquasilver(II) dicyanidoargentate(II)
4. Dicyanidosilver(I) diaquaargentate(I)
Subtopic: Introduction, Classification and Nomenclature |
63%
Level 2: 60%+
NEET - 2022
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Subtopic: 2nd & 3rd Law of Thermodynamics |
86%
Level 1: 80%+
NEET - 2022
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Which of the following contains 0.5 moles of a solute in one molal solution?
| 1. | 1000 g of solvent | 2. | 500 mL of solvent |
| 3. | 500 g of solvent | 4. | 100 mL of solvent |
Subtopic: Concentration Terms & Henry's Law |
74%
Level 2: 60%+
NEET - 2022
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Identify the incorrect statement from the following:
| 1. | The shapes of dxy, dyz, and dzx orbitals are similar to each other; and dx2 -y2 and dz2 are similar to each other. |
| 2. | All the five 5d orbitals are different in size when compared to the respective 4d orbitals. |
| 3. | All the five 4d orbitals have shapes similar to the respective 3d orbitals. |
| 4. | In an atom, all the five 3d orbitals are equal in energy in free state. |
Subtopic: d-Block Elements- Properties & Uses |
56%
Level 3: 35%-60%
NEET - 2022
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