The correct order of decreasing length of the bond as indicated by the arrow in the following structures is
I >II > III
II > I > III
III > II > I
I > III > II
An atomic nucleus having low n/p ratio tries to find stability by
the emission of an -particle
the emission of a positron
capturing an orbital electron (K-electron capture)
emission of a -particle
are example of
isotopes and isobars
isobars and isotones
isotones and isotopes
isobars and isotopes
B.
isobars and isotones
have the same mass number but different atomic number, so they are isobars.
Number of neutrons,
in
in
Because of the presence of same number of neutrons, 14Si30 and 16S32 are called isotones.
98Cf246 was formed along with a neutron when an unknown radioactive substance was bombarded with 6C12. The unknown substance was
91Pa234
90Th234
92U235
92U238
The values of H and S of a certain reaction are -400 kJ mol-1 and -20 kJ mol-1K-1 respectively. The temperature below which the reaction is spontaneous, is
100 K
20C
20 K
120C
The correct statement regarding the following energy diagrams is
Reaction M is faster and less exothermic than reaction N
Reaction M is slower and less exothermic than reaction N
Reaction M is faster and more exothermic than reaction N
Reaction M is slower and more exothermic than reaction N
The enthalpy of vaporisation of a certain liquid at its boiling point of 35°C is 24.64 kJ mol-1. The value of change in entropy for the process is
704 JK -1mol-1
80 JK -1mol-1
24.64 JK -1mol-1
7.04 JK-1mol-1
In case of heteronuclear diatomics of the type AB, where A is more electronegative than B, bonding molecular orbital resembles the character of A more than that of B. The statement
is false
is true
cannot be evaluated since data is not sufficient
is true only for certain systems