MCQ
Which of the following is not representative element ?
- ATellurium
- ✓Tantalum
- CThallium
- DAstatine
Metallic character decreases
Non-metallic character increases
$\Rightarrow$ It is due to increase in ionization enthalpy and increase in electron gain enthalpy.
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Assertion $A:$- Butylated hydroxyl anisole when added to butter increases its shelf life.
Reason $R:$- Butylated hydroxyl anisole is more reactive towards oxygen than food.
In the light of the above statements, choose the most appropriate answer from the options given below :-
$(a)$ Electron density in the $XY$ plane in $3d_x^2 - 3d_y^2$ orbital is zero
$(b)$ Electron density in the $XY$ plane in $3d_z^2$ orbital is zero
$(c)$ $2s$ orbital has one nodal surface
$(d)$ For $2pz$ orbital $YZ$ is the nodal plane.
Specify True or False.
(Given $\ln 10=2.3, R =8.3 JK ^{-1} mol ^{-1}, \log 2=0.30$ )