Rate determining step in nitration of benzene is
formation of NO2+
formation of carbocation
replacement of H atom
none of these.
The aqueous solution of which of the following salt will have the lowest pH ?
NaClO3
NaClO
NaClO4
NaClO2
Which ofthe following alkanes is optically active?
3-Methylhexane
Propane
2, 3, 4-Trimethylpentane
2-Methylbutane
Assertion : Na2SO4 is soluble in water while BaSO4 is not.
Reason : Lattice energy of BaSO4 exceeds its hydration energy.
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
If Assertion is true but Reason is false.
If Assertion is false but Reason is true.
Which of the following has highest second ionization energy?
Ni
V
Cr
Mn
C.
Cr
Electronic configuration for chromium is :
24Cr 1s2 2s2 2p6 3s2 3p6 3d5 4s1
After ionisation of 4s electron the next electron which will be ionised is from 3d orbital. As 3d5 electronic configuration, is stable, hence, the second ionisation of Cr will require much greater ionisation energy than the expected one.