If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion
If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion
If Assertion is true but the Reason is false
If both Assertion and Reason are false
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The Correct Option isA
Solution and Explanation
Hybridisation is $sp^2$ here and therefore planar structure is expected.
$NH^3 : 1s^2 , 2s^2 , 2p^3$
Hybridisation is $sp^3$ , therefore tetrahedral structure is expected but there is pyramical structure as lone pair of electron occupy one of the corners of tetrahedral.
P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.