A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at:

1. 1035 nm

2. 325 nm

3. 743 nm

4. 518 nm

The energy required to break one mole of CI–Cl bonds in Cl₂ is 242 kJmol⁻¹. The wavelength of light capable of breaking a single Cl–Cl bond is:$\mathrm{}\mathrm{}\mathrm{}{\mathrm{}}^{\mathrm{}}{}^{\mathrm{}}{\mathrm{}}_{\mathrm{}}$

1. 494 nm

2. 594 nm

3. 640 nm

4. 700 nm

Given that an electron in an atom moves at 600 m/s with an accuracy of 0.005%, what is the level of certainty in locating its position?
(h = 6.6 × 10^–34 kg m² s^–1, mass of electron,
e_m = 9.1 ×10^–31 kg) :

1. 1.52 × 10^–4 m
2. 5.10 × 10^–3 m
3. 1.92 × 10^–3 m
4. 3.84 × 10^–3 m

The wavelength (in nanometer) associated with a proton moving at 1.0 × 10³ ms^–1 (Mass of proton = 1.67 × 10^–27 kg and h = 6.63 × 10^–34 Js) is-:

1. 0.032 nm

2. 0.40 nm

3. 2.50 nm

4. 14.0 nm

The energy of an electron is given by E = – 2.178 × ${10}^{-18}\mathrm{J}\left(\frac{{\displaystyle {\mathrm{Z}}^2}}{{\displaystyle {\mathrm{n}}^2}}\right)$ Wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be:
(h = 6.62 × 10–³⁴ Js and c = 3.0 × 10⁸ ms^–1)

1. 6.500 × 10^–7 m

2. 8.500 × 10^–7 m

3. 1.214 × 10^–7 m

4. 2.816 × 10^–7 m

The correct set of four quantum numbers for the valence electrons of rubidium atom (Z = 37) is -

1. 5, 1, 0 + $\frac{1}{2}$

2. 5, 1, 1 + $\frac{1}{2}$

3. 5, 0, 1 +$\frac{1}{2}$

4. 5, 0, 0 + $\frac{1}{2}$

The electrons identified by quantum numbers n and l can be placed in order of increasing energy as:

a. n = 4, $\mathcal{l}$ = 1

b. n = 4, $\mathcal{l}$ = 0

c. n = 3, $\mathcal{l}$ = 2

d. n = 3, $\mathcal{l}$= 1

The radius of the second Bohr orbit for hydrogen atom is:

(Planck's Const. h = 6.6262 × 10^–34 Js; mass of electron = 9.1091 × 10^–31 kg; charge of electron e = 1.60210 ×10^–19 C; permittivity of vaccum ∈₀ = 8.854185 ×10^–12 kg^–1m^–3A²)

1. 0.529 Å

2. 2.12 Å

3. 1.65 Å

4. 7.76 Å

The plots of radial distribution functions for various orbitals of hydrogen atom against 'r' are given below:

a.

b.

c. 

d.

The correct plot for 3s orbital is:

1. (B)

2. (A)

3. (D)

4. (C)

According to Bohr's atomic theory:

Choose the most appropriate answer from the options given below :

1. (C) Only

2. (A) Only

3. (A), (C) and (D) only

4. (A) and (D) only