Chemistry Mcqs

Colour of fluorescene produced by cathode rays depends upon________________?

• (A)  Temperature
• (B)  Pressure
• (C)  Volume
• (D)  Composition of glass

Answer

Submitted By :Ali Uppal

The atomic number of an element having maximum number of unpaired electrons in p-subshell is_______________?

• (A)  7
• (B)  10
• (C)  12
• (D)  16

Answer

Submitted By :Ali Uppal

The letters s p d and f are used to represent which quantum numbers________________?

• (A)  Principal
• (B)  Azimuthal
• (C)  Magnetic
• (D)  Spin

Answer

Submitted By :Ali Uppal

Three quantum number have been derived from equation of____________________?

• (A)  de-Broglie
• (B)  Plancks
• (C)  Schrodinger
• (D)  Heisenberg

Answer

Submitted By :Ali Uppal

Splitting of spectral lines when atoms are subjected to strong electric filed is called_________________?

• (A)  Zeeman effect
• (B)  Stark effect
• (C)  Photoelectric effect
• (D)  Compton effect

Answer

Submitted By :Ali Uppal

When electron jump into orbit 1 then series obtained is___________________?

• (A)  Lyman
• (B)  Paschen
• (C)  Pfund
• (D)  Brackett

Answer

Submitted By :Ali Uppal

Spectrum is produced due to________________?

• (A)  Different wavelength
• (B)  Different colours
• (C)  Different intensities
• (D)  all have little contribution

Answer

Submitted By :Ali Uppal

Wavelength of electron was verified by_________________?

• (A)  Moseley
• (B)  Davisson and Germer
• (C)  Einstein
• (D)  Roentgen

Answer

Submitted By :Ali Uppal

Sommerfelds modification in Bohrs model is_______________?

• (A)  Orbit is cylindrical
• (B)  Orbit is elliptical
• (C)  Orbit is longitudinal
• (D)  Orbit is asymmetrical

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal