List of top Chemistry Questions on Dual nature of matter

The $\text{pH}$ of a solution with $[\text{H}^+] = 3.2 \times 10^{-3} \text{ M}$ is closest to:
Wavelengths of two photons are given as \(\lambda_1 = 3000 \, \text{Å}\) and \(\lambda_2 = 6000 \, \text{Å}\) respectively. Calculate the ratio of their energies \(\left( \frac{E_1}{E_2} \right)\).
The work functions of two metals ($M_A$ and $M_B$) are in the 1 : 2 ratio. When these metals are exposed to photons of energy 6 eV, the kinetic energy of liberated electrons of $M_A$ : $M_B$ is in the ratio of 2.642 : 1. The work functions (in eV) of $M_A$ and $M_B$ are respectively.
Choose the incorrect statement from the following
An ideal gas mixture of C\(_2\)H\(_6\) and C\(_2\)H\(_4\) occupies a volume of 28 L at 1 atm and 273 K. This mixture reacts completely with 128 g of O\(_2\) to produce CO\(_2\) and H\(_2\)O(\(l\)). What is the mole fraction of C\(_2\)H\(_4\) in the mixture ?
In the electrolysis of acidulated water, it is desired to obtain \(1.12\ \text{cc}\) of hydrogen per second under STP condition. The current to be passed is:
For a proton and electron both with the same kinetic energy, what is the ratio of their de Broglie wavelengths?

Number of photons emitted by 10 watt bulb in 10 seconds, if wavelength of light is 1000 \(\AA\) is

The ratio of velocities of two photons of wavelengths \(2000\,\text{\AA}\) and \(4000\,\text{\AA}\) is

The wavelength associated with the electron moving in the first orbit of hydrogen atom with velocity $ 2.2 \times 10^6\, \text{m/s} $ is (in nm):
(Given: $ m_e = 9.0 \times 10^{-31}\, \text{kg},\ h = 6.6 \times 10^{-34}\, \text{Js} $)