The PH of Tears is __________?

A. 7.0
B. 7.4
C. 7.8
D. 8.2

The PH of pure water at 25°C, kw=1×10-4____________?

A. 0
B. 7
C. 14
D. None of above

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

Alpha particles can be detected by using___________?

A. Gold foils
B. Barium sulphate
C. Zinc sulphide screen
D. Thin aluminium sheet

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

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°

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

Magnetic quantum number specifies___________?

A. Size of orbitals
B. Shape of orbitals
C. Orientation of orbitals
D. All of the above

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

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