The work done when 1 mole of gas expands reversibly and isothermally from a pressure of 5 atm to 1 atm at 300 K is:
[Given: log 5 = 0.6989 and R = 8.314 J K-1 mol-1]
| 1. | Zero J | 2. | 150 J |
| 3. | +4014.6 J | 4. | -4014.6 J |
A set of species capable of showing disproportionation reactions is:
| 1. | \(\mathrm{ClO^–_2, ~ClO^–_3,~ ClO^–_4, ~Cl_2}\) |
| 2. | \(\mathrm{Cl_2, ~ClO^–_2, ~ClO^–_3, ~S_8}\) |
| 3. | \(\mathrm{ClO^–_4, ~ClO^–, ~ClO^–_2, ~F_2}\) |
| 4. | \(\mathrm{ClO^–_3, ~ClO^–_4, ~H_2O_2, ~ClO^–}\) |
Match the bond line structures of hydrocarbons given in List-I with the corresponding boiling points given in List-II.
| List-I (Compound) | List-II (Boiling point in K) | ||
| (a) |  |
(i) | 300.9 |
| (b) |  |
(ii) | 282.5 |
| (c) |  |
(iii) | 309.1 |
| (d) |  |
(iv) | 341.9 |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (i) | (iv) | (iii) | (ii) |
| 2. | (iii) | (i) | (iv) | (ii) |
| 3. | (iii) | (iv) | (i) | (ii) |
| 4. | (iv) | (i) | (ii) | (iii) |
\(\mathrm{COCl}_2(g) \rightleftharpoons \mathrm{CO}(g)+\mathrm{Cl}_2(g)\)
After placing a mixture of gases in the reaction vessel, the concentrations were measured to be \(\left[\mathrm{COCl}_2\right]=3.50 \times 10^{-3} \mathrm{M},[\mathrm{CO}]=1.11 \times 10^{-5} \mathrm{M},\) and \(\left[\mathrm{Cl}_2\right] =3.25 \times 10^{-6} \mathrm{M}.\)
Which statement below accurately describes this reaction?
1. The reaction is at equilibrium.
2. The reaction is not at equilibrium and shifts left.
3. The reaction is not at equilibrium and shifts right.
4. The reaction quotient is equal to \(K_c\).
1. \(\text {Ge}\)
2. \(\text {Si}\)
3. \(\text {Sn}\)
4. \(\text {Pb}\)
Match the statements given in List-I with the corresponding element given in List-II:
| List-I (Characteristics) |
List-II (Elements) |
||
| (a) | Element that exhibits +3 oxidation state only. | (i) | Mn |
| (b) | An element that exhibits more number of oxidation states. | (ii) | Zn |
| (c) | Element which is a reducing agent in its +2 oxidation state. | (iii) | Sc |
| (d) | An element that is not considered as a transition element. | (iv) | Cr |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (iv) | (i) | (ii) |
| 2. | (iv) | (i) | (ii) | (iii) |
| 3. | (ii) | (iv) | (iii) | (i) |
| 4. | (iii) | (i) | (iv) | (ii) |
Which one of the following statements is true about the structure of \(\mathrm{CO^{2-}_3}\) ion?
| 1. | It can be explained by considering sp3 hybridization. |
| 2. | Out of the three C–O bonds, two are longer and one is shorter. |
| 3. | It has three sigma and three \(\pi\)-bonds. |
| 4. | All three C–O bonds are equal in length with a bond order in between 1 and 2. |
Which one of the following is the correct order of decreasing bond enthalpies for the given species?
1. \(\mathrm {O^{2-}_2>O^-_2>O_2>N_2 }\)
2. \(\mathrm {N_2>O_2>O^{2-}_2>O^-_2 }\)
3. \(\mathrm {N_2>O_2>O^-_2>O^{2-}_2 }\)
4. \(\mathrm {O_2>N_2>O^-_2>O^{2-}_2 }\)
The three cells with their \(E^\circ_{\text{(cell)}}\) values are given below:
| Cells | \(E^\circ_{\text{(cell)}}/V\) | |
| (a) | Fe|Fe2+||Fe3+|Fe | 0.404 |
| (b) | Fe|Fe2+||Fe3+, Fe2+|Pt | 1.211 |
| (c) | Fe|Fe3+||Fe3+, Fe2+|Pt | 0.807 |
(F represents the charge on 1 mole of electrons.)
| 1. | –1.212 F, –1.211 F, –0.807 F |
| 2. | +2.424 F, +2.422 F, +2.421 F |
| 3. | –0.808 F, –2.422 F, –2.421 F |
| 4. | –2.424 F, –2.422 F, –2.421 F |
Which one of the following electrons in the ground state will have the least amount of energy?
| 1. | An electron in hydrogen atom. |
| 2. | An electron in 2p orbital of carbon atom. |
| 3. | The electron of copper atom present in 4s orbital. |
| 4. | The outermost electron in sodium atom. |
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