Argon is used
in filling airships
to obtain low temperature
in high temperature welding
in radiotherapy for treatment of cancer
The number of electrons, neutrons and protons in a species are equal to 10, 8 and 8 respectively. The proper symbol of the species is
56 g of nitrogen and 96 g of oxygen are mixed isothermally and at a total pressure of 10 atrn. The partial pressures of oxygen and nitrogen (in atm) are respectively
4, 6
5, 5
2, 8
6, 4
The metal that produces red-violet colour in the non-luminous flame is
Ba
Ag
Rb
Pb
C.
Rb
Alkali metals and their salts impart a characteristic colour to flame. The reason for flame colouration is that the energy ofthe flame causes an excitation of the outermost electrons which when return to their original position, give out the energy so absorbed in the visible region. Thus, Rb gives red-violet colour to the flame.
According to the first law of thermodynamics which of the following quantities represents the change in a state function?
qrev
qrev - Wrev
qrev + Wrev
The expression for the solubility product of Ag2CO3 will be
Ksp = s2
Ksp = 4s3
Ksp = 27s4
Ksp = s
A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 nm. How many photons are emitted from the lamp per second? (h = 6.626x 10-34 J-s; velocity of light = 3x108 ms-1)
1 x 1019
1 x 1020
1 x 1021
1 x 1023