Which of the following is the correct increasing bond order for the given diatomic species?
C.
Bond order=
Thus, the correct order of bond order is,
The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is .
The value of n, will be
[R=Rydberg constant]
1
2
3
4
The first ionisation enthalpy of boron is less than beryllium because:
Boron has high nuclear charge
The size of boron atom is more than beryllium atom
p-subshell of boron has only one electron
The size cit boron atom is less than beryllium atom
As the temperature is raised from 20°C to 40C, the average kinetic energy of neon atoms changes by a factor:
2
The dipole moment of HBr is 2.60 x 10-30 Cm and the interatomic spacing is 1.41 .The percent ionic character of HBr is:
11.5%
10.1%
8.2%
4.1%
For an electron whose x-positional uncertainity is 1x 10-10 m, the uncertainity in the x-component of the velocity in ms-1 will be of the order of:
106
103
1012
1015
Which of the following statement(s) is/are correct regarding shielding effect?
The magnitude of screening effect do not depends upon the number of inner electrons
The magnitude of effective nuclear charge decreases in a period.
Greater the shielding effect, lower will be the atomic radii
For a given 'orbit' the shielding effect of electron belonging to different subshell decrease in the order s > p > d >f
When NaNO3 is heated in a closed vessel oxygen is liberated and NaNO3 is left behind,
At equilibrium:
addition of NaNO2 favours reverse reaction
addition of NaNO3 favours reverse reaction
increasing temperature favours forward reaction
decreasing temperature favours backward reaction
:
CaO does not react to CO2 to give CaCO3
backward reaction is very low
CO2 formed escapes out
None of the above