The reduction potential of hydrogen half-cell will be negative if
p(H2) = 1 atm and [H+] = 2.0 M
p(H2) = 1 atm and [H+] = 1.0 M
p(H2) = 2 atm and [H+] = 1.0 M
p(H2) = 2 atm and [H+] = 1.0 M
Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?
Al2O3 < MgO < Na2O < K2O
MgO < K2O < Al2O3 < Na2O
Na2O < K2O < MgO < Al2O3
Na2O < K2O < MgO < Al2O3
A.
Al2O3 < MgO < Na2O < K2O
As the metallic character of element attached to oxygen atom increases, the difference between the electronegativity values of element and oxygen increases and thus the basic character of oxides increases and vice-versa. Hence the increasing correct order of basic nature is Al2O3 < MgO < Na2O < K2O.
Which of the following statements regarding sulphur is incorrect?
S2 molecule is paramagnetic.
The vapour at 200ºC consists mostly of S8 rings.
At 600ºC the gas mainly consists of S2 molecules.
At 600ºC the gas mainly consists of S2 molecules.
Which of the following facts about the complex [Cr(NH3)6]Cl3 is wrong?
The complex involves d2sp3 hybridisation and is octahedral in shape.
The complex is paramagnetic.
The complex is an outer orbital complex.
The complex is an outer orbital complex.
The rate of a chemical reaction doubles for every 10ºC rise of temperature. If the temperature is raised by 50ºC, the rate of the reaction increases by about
10 times
24 times
32 times
32 times
A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of the CO2 is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of K is
1.8 atm
3 atm
0.3 atm
0.3 atm
In the context of the lanthanoids, which of the following statement is not correct?
There is a gradual decrease in the radii of the members with increasing atomic number in the series.
All the member exhibit +3 oxidation state.
Because of similar properties, the separation of lanthanoids is not easy.
Because of similar properties, the separation of lanthanoids is not easy.
In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is:
A2B
AB2
A2B3
A2B3