The number of octahedral sites per sphere arranged in a face centred cubic structure, is
1
2
3
4
A.
1
The number of octahedral sites pre sphere arranged in a face centred cubic structure is one.
50mL of benzene is mixed with 50mL of chloroform. What is the volume of solution?
Less than 100 mL
More than 100 mL
Equal to 100 mL
None of the above
For a first order reaction, velocity constant, k =10-3 s-1. Two third life for it would be
1100s
2200s
3300s
4400s
The reaction 2NO2(g) + O2(g) 2NO2(g) is of first order. If volume of reaction vessel is reduced to 1/3, the rate of reaction would be
1/3 times
2/3 times
3 times
6 times
For the functioning of enzymes which of the following statements is not correct?
An optimum temperature is needed
An optimum pH is needed
They are substrate specific
They always increase activation energy
In the acidic solution of copper sulphate and alkaline solution of copper cyanide respectively same electric current is flown for a definite time, which of the following statement is correct for this?
Amount of copper deposited in both the solution is the same
Amount of copper deposited in alkaline copper cyanide solution is less
Amount of copper deposited in acidic copper sulphate solution is less
None of the above
What is the emf of the cell, whose half cells are given below
Mg2+ + 2e- → Mg(s) E =-2.37 V
Cu2+ + 2e- → Cu(s) E =+0.34 V
-2.30V
1.336V
2.17V
2.93V
What is the role of a catalyst in a catalysed reaction?
Lowers the activation energy
Increases the activation energy
Affects the free energy change
Affects the enthalpy change