Q. No.Calculate the spectral lines that are obtained in the visible region when an electron jumps from n=5 to n=1 in a hydrogen atom:
1. Three (3)
2. Four (4)
3. Six (6)
4. Ten (10)
2. Four (4)
3. Six (6)
4. Ten (10)
Given below are two statements:
| Statement I: | Line emission spectra are useful in the study of electronic structure. |
| Statement II: | Each element has a unique line emission spectrum. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
The variation of radial probability density R2(r) as a function of distance (r ) of the electron from the nucleus for 3p-orbital is captured in which of the following graphs?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
The number of electrons that can be fit into the orbital for which n = 3 and l = 1, is:
1. 2
2. 6
3. 10
4. 14
Photons of wavelength 4000 are used to break molecules. The percentage of energy converted
to the kinetic energy of atoms will be:
[Given: Bond dissociation energy of the molecule is 246.5 kJ/mol]
1. 12%
2. 8%
3. 26%
4. 17%
An absorption line of the lowest frequency in the transition of hydrogen spectra is:
1. n=1 to n=2
2. n=3 to n=8
3. n=2 to n=1
4. n=8 to n=3
| Assertion (A): | An ideal black body emits and absorbs radiation of every possible frequency. |
| Reason (R): | An increase in the temperature of a body causes its radiation spectrum to peak at progressively higher frequencies. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Given below are two statements:
| Statement I: | The frequency at which wavelength of 400 nm is 9.50×1014Hz. |
| Statement II: | The frequency at which wavelength of 750 nm is 4.00×1014 Hz. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
In which of the following transitions of hydrogen atom, radiation of minimum frequency is emitted ?
1. n2 = \(\infty\) to n1 = 1
2. n2 = 2 to n1 = 1
3. n2 = 3 to n1 = 2
4. n2 = \(\infty\) to n1 = 3
| Assertion (A): | Angular momentum of the electron in the orbit that has four subshells is \(2h\over\pi\). |
| Reason (R): | Angular momentum of the electron is quantized. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
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