Chemistry Mcqs

Presence of nitrogen in organic compounds is tested as__________?

• (A)  Nitrogen gas
• (B)  NH3
• (C)  CN‾
• (D)  NO

Answer

Submitted By :Ali Uppal

Which of the following gases shows more ideal behaviour at 0°C___________?

• (A)  H2
• (B)  CH4
• (C)  He
• (D)  NH3

Answer

Submitted By :Ali Uppal

The energy of one mole of photons of radiation, whose frequency is 4×10 14 Hz, is ___________?

• (A)  159.6kJ
• (B)  135.5 KJ
• (C)  110.5 KJ
• (D)  80.4 KJ

Answer

Submitted By :Ali Uppal

Azimuthal quantum number defines___________?

• (A)  e/m ratio of an electron
• (B)  Spin of an electron
• (C)  Angular momentum of an electron
• (D)  Magnetic momentum of an electron

Answer

Submitted By :Ali Uppal

Magnetic quantum number specifies___________?

• (A)  Size of orbitals
• (B)  Shape of orbitals
• (C)  Orientation of orbitals
• (D)  All of the above

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

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°

Answer

Submitted By :Ali Uppal

Which one of the following is the correct sequence according to atomic weights?

• (A)  Fe>Co> Ni
• (B)  Co > Ni > Fe
• (C)  Ni> Co> Fe
• (D)  Co >Fe>Ni

Answer

Submitted By :Ali Uppal

Alpha particles can be detected by using___________?

• (A)  Gold foils
• (B)  Barium sulphate
• (C)  Zinc sulphide screen
• (D)  Thin Aluminium sheet

Answer

Submitted By :Ali Uppal

When 0.01 moles of NaOH are added to a buffer solution, its PH changes from 4.745 to 4.832. What is its?

• (A)  0.115
• (B)  0.900
• (C)  0.015
• (D)  0.215

Answer

Submitted By :Ali Uppal