B. Tech (CSE & AI), Section D46A and D46B

The different types of energies associated with a molecule are __________

• Electronic energy                             

• Vibrational energy

• Rotational energy                         

• All of the mentioned

Which of the following transitions between rotational energy levels is not allowed?

           

• J = 0 ← J = 1 

• J = 1 ← J = 2

• J = 1 → J = 0

• J = 1 ← J = 3

1ppm = (a)   mg/L

Calculate the wave number (in cm^-1) of a radiation whose wavelength is 2.5 µ.

(a)  

The distance between the two adjacent crests and troughs of a wave is called its

• wavelength

• frequency

• wave number

• velocity

Visible light lies between the wavelength range

• 3800-7600 Å

• 2500-3800 Å

• 3000-7000 Å

• 7500-8000 Å

The most commonly used unit to express hardnedd is

• Degree French

• Degree Clarke

• ppm

• grains/gallons

Hardness of water is due to

• K and Na salts

• Salts of iron

• Salts of Ca and Mg

• SiO₂

If a sample of hard water contains 20mg/L of MgSO₄, hen its CaCO₃ equivalent is equal to

• 16.7 ppm

• 20.3 ppm

• 11.3 ppm

• 8 ppm

Which radiation has rotational phenomenon?

• Microwave 

• Infrared

• X-rays 

• Visible