Which of the following chemical species will dominantly exist in water having a pH of less than 5?

Question

What will be the energy of 1 mole of photons having a wavelength of 200 nm?
Planck’s constant, \( h = 6.6 \times 10^{-34} \, \mathrm{Js} \) and Speed of light, \( c = 3.0 \times 10^8 \, \mathrm{ms^{-1}} \)

Answer 1

Water with a pH below 5 is acidic. In this acidic state, carbonic acid (H₂CO₃) is the primary species, due to the equilibrium shifting towards the protonated form of carbon dioxide in water:

CO₂ + H₂O ⇌ H₂CO₃

Bicarbonate (HCO₃⁻) and carbonate (CO₃²⁻) become predominant only at elevated pH levels.

LIST I (Experiment)	LIST II (Conclusion)
A. Photoelectric effect	I. Ether medium does not exist
B. Michelson-Morley	II. Light is made up of photons
C. Stern-Gerlach	III. Quantization of electronic orbit
D. Franck-Hertz	IV. Electron spin moment

Firm 2	Cooperate	Compete
Firm 1	5, 5	0, 10
Compete	10,0	2, 2

Which of the following chemical species will dominantly exist in water having a pH of less than 5?

Show Hint

The Correct Option is C

Solution and Explanation

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