Which of the following is not correct about postulates of the kinetic molecular theory of gases?
| 1 . | Pressure of the gas is due to the collision of molecules against the walls of the container. |
| 2. | Volume of the gas is due to the large number of molecules of the gas. |
| 3. | Average kinetic energy of molecules is directly proportional to the absolute temperature of the gas. |
| 4. | The molecules move randomly with different speeds in different directions. |
| 1. | \(\mathrm{CH_3SiCl_3}\) | 2. | \(\mathrm{SiCl_4}\) |
| 3. | \(\mathrm{(CH_3)_2SiCl_2}\) | 4. | \(\mathrm{(CH_3)_3SiCl}\) |
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. \(\mathrm {O_2>N_2>O^-_2>O^{2-}_2 }\)
A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because:
| 1. | all the domains get oriented in the direction opposite to the direction of magnetic field. |
| 2. | domains are not affected by magnetic field. |
| 3. | domains get randomly oriented. |
| 4. | all the domains get oriented in the direction of magnetic field. |
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. |
Alkali metals, though white, impart characteristic color to the flame because of
| 1. | excitation and coming back of valence electrons to the original level. |
| 2. | oxidation of metal in the presence of flame. |
| 3. | excitation of valence electrons. |
| 4. | gain of electrons. |
The increasing order of reactivity of the following compounds towards acid-catalyzed dehydration is:
| a. |  |
b. |  |
| c. |  |
d. |  |
| 1. | (b) < (c) < (a) < (d) | 2. | (b) < (a) < (c) < (d) |
| 3. | (a) < (c) < (d) < (b) | 4. | (c) < (a) < (b) < (d) |
© 2026 GoodEd Technologies Pvt. Ltd.