Consider the following data of compounds:
Which of the following represents a correct set of compounds having an equal number of atoms?
| A. | \(212 ~g ~\text{of}~Na_2CO_3 (s) \text{[molar mass}=106 ~g]\) |
| B. | \(~248 g ~\text{of}~ {Na}_2 \mathrm{O}({s}) [\text{molar mass} =62 \mathrm{~g} ]\) |
| C. | \(240 g ~\text{of} ~NaOH (s)~ [\text{molar mass} =40 \mathrm{~g} \) |
| D. | \( 12 g~ \text{of}~ \mathrm{H}_2(\mathrm{~g})[ \text{molar mass} =2 \mathrm{~g}].\) |
| E. | \( 220 g~ \text{of} ~\mathrm{CO}_2(\mathrm{~g})[\text{ molar mass }=44 \mathrm{~g}]\) |
| 1. | B, C, and D only | 2. | B, D, and E only |
| 3. | A, B, and C only | 4. | A, B, and D only |
Subtopic: Moles, Atoms & Electrons |
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Which of the following are paramagnetic?
Choose the correct answer from the options given below:
| A. | \(\left[{NiCl}_4\right]^{2-}\) | B. | \(Ni(CO)_4\) |
| C. | \(\left[{Ni}({CN})_4\right]^{2-}\) | D. | \(\left[{Ni}\left({H}_2 {O}\right)_6\right]^{2+}\) |
| E. | \({Ni}\left({PPh}_3\right)_4\) | ||
| 1. | A and D only | 2. | A, D and E only |
| 3. | A and C only | 4. | B and E only |
Subtopic: VBT, CFT & their Limitations |
Level 3: 35%-60%
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If the half-life \((t_{1/2})\) for a first order reaction is \(1~\text{minute}\), then the time required for \(99.9 \%\) completion of the reaction is closest to :
1. \(5~\text{minutes}\)
2. \(10~\text{minutes}\)
3. \(2~\text{minutes}\)
4. \(4~\text{minutes}\)
1. \(5~\text{minutes}\)
2. \(10~\text{minutes}\)
3. \(2~\text{minutes}\)
4. \(4~\text{minutes}\)
Subtopic: First Order Reaction Kinetics |
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Energy and radius of the first Bohr orbit of He+ and Li2+ are: [Given \(\left.\mathrm{R}_{\mathrm{H}}=2.18 \times 10^{-18} \mathrm{~J}, \mathrm{a}_0=52.9 \mathrm{pm}\right]\)
| 1. | \(\begin{aligned} & \mathrm{E}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=-19.62 \times 10^{-16} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=17.6\mathrm{pm} \\ & \mathrm{E}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=8.72 \times 10^{-16} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=26.4 \mathrm{pm} \end{aligned}\) |
| 2. | \(\begin{aligned} & \mathrm{E}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=-8.72 \times 10^{-16} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=17.6 \mathrm{pm} \\ & \mathrm{E}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=-19.62 \times 10^{-16} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=17.6 \mathrm{pm} \end{aligned}\) |
| 3. | \(\begin{aligned} & \mathrm{E}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=- 19.62 \times 10^{-18} \mathrm{~J} \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=17.6 \mathrm{pm} \\ & \mathrm{E}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=-8.72 \times 10^{-18} \mathrm{~J} \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=26.4 \mathrm{pm} \end{aligned}\) |
| 4. | \(\begin{aligned} & \mathrm{E}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=-8.72 \times 10^{-18} \mathrm{~J} \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=26.4 \mathrm{pm} \\ & \mathrm{E}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=-19.62 \times 10^{-18} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=17.6 \mathrm{pm} \end{aligned} \) |
Subtopic: Bohr's Theory |
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Among the given compounds I-III, the correct order of bond dissociation energy of \(C-H\) bond marked with * is:
1. III > II > I
2. II > III > I
3. II > I > III
4. I > II > III
 |
 |
 |
| I | II | III |
2. II > III > I
3. II > I > III
4. I > II > III
Subtopic: Aliphatic Hydrocarbon- Physical Properties | Aromatic Hydrocarbons - Nomenclature, Isomerism & Huckel's Rule |
Level 3: 35%-60%
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Atomic theory could not explain which of the following?
| 1. | Law of multiple proportion | 2. | Law of gaseous volume |
| 3. | Law of conservation of mass | 4. | Law of constant proportion |
Subtopic: Introduction |
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Identify the correct orders against the property mentioned:
Choose the correct answer from the options given below:
| A. | \(\mathrm{H}_2 \mathrm{O}>\mathrm{NH}_3>\mathrm{CHCl}_3 -\text { }\)dipole moment |
| B. | \(\mathrm{XeF}_4>\mathrm{XeO}_3>\mathrm{XeF}_2-\text { }\)number of lone pairs on central atom |
| C. | \(\mathrm{O}-\mathrm{H}>\mathrm{C}-\mathrm{H}>\mathrm{N}-\mathrm{O}-\text { }\)bond length |
| D. | \(\mathrm{N}_2>\mathrm{O}_2>\mathrm{H}_2 \text { } -\) bond enthalpy |
| 1. | A and C only | 2. | B and C only |
| 3. | A and D only | 4. | B and D only |
Subtopic: M.O.T | Polarity | V.S.E.P.R & V.B.T |
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Match List-I with List-II:
Choose the correct answer from the options given below:
| List-I (Name of Vitamin) |
List-II (Deficiency disease) |
||
| A. | Vitamin \(B_{12}\) | I. | Cheilosis |
| B. | Vitamin \(D\) | II. | Convulsions |
| C. | Vitamin \(B_{2}\) | III. | Rickets |
| D. | Vitamin \(B_{6}\) | IV. | Pernicious anaemia |
| 1. | A-II, B-III, C-I, D-IV | 2. | A-IV, B-III, C-II, D-I |
| 3. | A-I, B-III, C-II, D-IV | 4. | A-IV, B-III, C-I, D-II |
Subtopic: Vitamins, Hormones & Enzymes |
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The correct order of decreasing basic strength of the given amines is:
| 1. | N-ethylethanamine > ethanamine > N -methylaniline > benzenamine |
| 2. | benzenamine > ethanamine > N -methylaniline >N-ethylethanamine |
| 3. | N -methylaniline > benzenamine > ethanamine >N-ethylethanamine |
| 4. | N-ethylethanamine > ethanamine > benzenamine >N-methylaniline |
Subtopic: Amines - Preparation & Properties |
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The correct order of the wavelength of light absorbed by the following complexes is.
Choose the correct answer from the options given below:
| A. | \(\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+} \) | B. | \(\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-} \) |
| C. | \(\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+} \) | D. | \(\left[\mathrm{Ti}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}\) |
| 1. | C < D < A < B | 2. | C < A < D < B |
| 3. | B < D < A < C | 4. | B < A < D < C |
Subtopic: VBT, CFT & their Limitations |
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