The number of angular nodes and radial nodes in 3s orbital are :
1. | 0 and 2, respectively | 2. | 1 and 0, respectively |
3. | 3 and 0, respectively | 4. | 0 and 1, respectively |
According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?
1. n = 5 to n = 3
2. n = 6 to n = 1
3. n = 5 to n = 4
4. n = 6 to n = 5
A 0.66 kg ball is moving with a speed of 100 m/s. The associated wavelength will be:
1.
2.
3.
4.
The nuclei of which one of the following pairs are isotones:
1. | \(34 \mathrm{Se}^{74},{ }_{31} \mathrm{Ga}^{71}\) | 2. | \({ }_{38} \mathrm{Sr}^{84},{ }_{38} \mathrm{Sr}^{86}\) |
3. | \({ }_{42} \mathrm{Mo}^{92},{ }_{40} \mathrm{Zr}^{92}\) | 4. | \({ }_{20} \mathrm{Ca}^{40},{ }_{16} \mathrm{~S}^{32}\) |
If the energy value is E = 3.03 × 10–19 Joules, (h = 6.6×10–34 J x sec., C = 3×108 m/sec), then the value of the corresponding wavelength is:
1. | 65.3 nm | 2. | 6.53 nm |
3. | 3.4 nm | 4. | 653 nm |
If the energy of the second Bohr orbit of the hydrogen atom is –328 kJ mol–1, the energy of the fourth Bohr orbit would be:
1. | –1312 kJ mol–1 | 2. | –82 kJ mol–1 |
3. | –41 kJ mol–1 | 4. | –164 kJ mol–1 |
Which of the following molecule is not paramagnetic:
1.
2.
3.
4. None of the above
The radius of a hydrogen shell is 0.53Å. In its first excited state, radius of the shell will be:
1. 2.12 Å
2. 1.06 Å
3. 8.5 Å
4. 4.24 Å
Uncertainty in position of a and He is similar. If uncertainty in momentum of is , then uncertainty in momentum of He will be:
1. | 32 × 105 | 2. | 16×105 |
3. | 8 × 105 | 4. | None of the above |
Ionization energy of second orbit of will be:
1. 122.4 eV
2. 40.8 eV
3. 30.6 eV
4. 13.6 eV