Pfund series are produced in the spectrum of hydrogen atom__________________?

A. when electrons jump down to 2nd- orbit
B. when electrons jump down to 3rd- orbit
C. when electrons jump down to 4th- orbit
D. when electrons jump down to 5th- orbit

Related Mcqs:

Spectrum is produced due to________________?
A. Different wavelength
B. Different colours
C. Different intensities
D. all have little contribution
Water Gas is a mixture of two gases Hydrogen & Carbon monoxide, while separating Hydrogen gas by liquification process which one is liquefied first__?
A. Hydrogen Gas
B. Carbon Monoxide Gas
C. Both at same time
D. None of them
Submitted by: Aamir khan Hullio
Water Gas is a mixture of two gases Hydrogen & Carbon monoxide, while separating Hydrogen gas by liquification process which one is liquefied first__?
A. Hydrogen Gas
B. Carbon Monoxide Gas
C. Both at same time
D. None of them
Submitted by: Aamir khan Hullio
If R is the Rydberg constant for hydrogen, then wave-number of the second line in the Lyman series is _________?
A. 2 R
B. R/2
C. 3R/4
D. R/4
Submitted by: Muhammad Ali Kunbhar
When an atom absorbs energy the lines in the spectrum will appear which are_________________?
A. Brighter
B. Darker
C. Colourless
D. Hard to locate
Generally the limit of visible spectrum is__________?
A. 1000 to 300 A°
B. 3800 to 7600 A°
C. 8000 to 10,000 A°
D. 12,000 to 15,000 A°
Submitted by: Muhammad Ali Kunbhar
Replacement of hydrogen of benzene by alkyl group in the presence of alkyl halide & aluminum chloride is known as__________________?
A. Dows process
B. Friedel & Craft acylation
C. Friedel & Craft alkylation
D. Clemmenson reduction
When one hydrogen atom of alkane is removed then it is called________________?
A. alkene
B. alkyl
C. aldehyde
D. saturated hydrocarbon
A scale which used to measure the Hydrogen Ion concentration in a solution is known as__________?
A. Thermometer
B. Viscometer
C. PH Scale
D. Stagmometer
Submitted by: Ali Jan
The method in which more steam is passed through the water Gas to oxidize CO to Carbon Dioxide which is then more soluble in water than Hydrogen gas and gets separated is called______.
A. liquification process
B. Bosch Process
C. Fragmentation
D. Thermal decomposition
Submitted by: Aamir khan Hullio