Q. No.Which of the following sets of quantum numbers is possible :
1. n = 0, l = 0, ml = 0, ms = + ½
2. n = 1, l = 0, ml = 0, ms = – ½
3. n = 1, l = 1, ml = 0, ms = + ½
4. n = 3, l = 3, ml = –3, ms = + ½
1. n = 0, l = 0, ml = 0, ms = + ½
2. n = 1, l = 0, ml = 0, ms = – ½
3. n = 1, l = 1, ml = 0, ms = + ½
4. n = 3, l = 3, ml = –3, ms = + ½
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The total number of electrons in an atom with the following quantum numbers would be
(a) n = 4, ms = – ½
(b) n = 3, l = 0
1. 16, 2
2. 11, 8
3. 16, 8
4. 12, 7
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The transition in the hydrogen spectrum that would have the same wavelength as Balmer transition from n = 4 to n = 2 of He+ spectrum is :
1.
2. = 3 to n1 = 2
3. = 3 to n1 = 1
4. = 2 to n1 = 1
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2 × 108 atoms of carbon are arranged side by side. The radius of a carbon atom if the length of this arrangement is 2.4 cm would be :
1. 7.0 × 10–11 m
2. 5.0 × 10–11 m
3. 8.0 × 10–11 m
4. 6.0 × 10–11 m
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What is the number of zinc atoms present in a linear arrangement of length 1.6 cm, given that the diameter of a zinc atom is 2.6 Å?
| 1. | 5.153 × 107 | 2. | 6.153 × 107 |
| 3. | 4.153 × 109 | 4. | 6.153 × 103 |
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A certain particle carries 2.5 × 10–16 C of static electric charge. The number of electrons present in it would be:
| 1. | 1460 | 2. | 1350 |
| 3. | 1560 | 4. | 1660 |
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In Rutherford's \(\alpha\)-particle scattering experiment, a thin foil of heavy metals like gold or platinum is typically used. If a lighter metal foil, such as aluminum, were used instead, how would the observed deflection patterns change?
1. The same results will be observed
2. More deflection would be observed
3. There will not be enough deflection
4. None of the above
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Why are the symbols ⁷⁹₃₅Br, and ⁷⁹Br are considered acceptable, whereas ³⁵₇9Br and ³⁵Brand are not acceptable representations of bromine?
| 1. | The general convention for representing an element along with its atomic number (A) and atomic mass (Z) is |
| 2. | The general convention for representing an element along with its atomic mass (A) and atomic number (Z) is |
| 3. | The general convention for representing an element along with its wavelength (A) and frequency (Z) is |
| 4. | The general convention for representing an element along with its isotopes (A) and atomic number (Z) is |
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What is the correct arrangement of the following electromagnetic spectrum in the increasing order of frequency?
| 1. | Cosmic rays < Amber light < Radiation of FM radio < X-rays < Radiation from microwave ovens |
| 2. | Radiation from FM radio < Radiation from microwave oven < Amber light < X- rays < Cosmic rays |
| 3. | Radiation from microwave ovens < Amber light < Radiation of FM radio < X-rays < Cosmic rays |
| 4. | Cosmic rays < X-rays < Radiation from microwave ovens < Amber light < Radiation of FM radio |
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The work function of the Cesium atom is \(1.9~\mathrm{eV}.\) What is the threshold frequency of radiation for this atom?
| 1. | \(4.59 \times10^{14}~s^{-1}\) | 2. | \(8.59 \times10^{14}~s^{-1}\) |
| 3. | \(5.59 \times10^{-14}~s^{-1}\) | 4. | \(65.9 \times10^{14}~s^{-1}\) |
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