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
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
Which will liberate bromine from a solution of potassium bromide?
I2
Cl2
SO2
HI
B.
Cl2
Since, E° of Cl2 is higher than that of Br2 therefore Cl, has a higher tendency to accept electrons than Br-. Conversely, Br- ion has a higher tendency to lose electrons than Cl- ion. Therefore, the following reaction will occur
KBr K+ + Br-
2Br- + Cl2 2Cl- + Br2
Thus, Br- ions are oxidised to Br2 by Cl2, which itself is reduced to Cl- ions.