Atomic structure.. Prev IIT ques

Ans 1...D..says Arihant 30 years IIT-JEE..reason given..Plus and Minus signs only indicate the rotation of electrons around its axis in opposite directions. Hence two quantum mechanical spin states which have no classical analogue..
FIITJEE Archive says C..no reason given...

Ans 2..Rutherford α scattering experiment lead to the conclusion that nucleus is deep buried inside the atom..but on seeing the option only B seems to be correct..

Ans 4 ..second statement is incorrect..coz Nucleides having odd no. of protons and neutrons exist in nature like ¹⁴N₇ ...but one can say that they are relatively less stable than nucleides containing even protons and even neutrons...

1. [3] MTG 32 yrs says C while BT says D

1. (D) Plus and minus only indicate the rotation of electrons around its axis in opp. directions. Hence two quantum mechanical spin states which have no classical analogue.
2. (B) electrons occupy space around nucleus.It is a fact.
3. (D) E=hv ( in form of particle and wave )
4. (C) A is correct since n/p ratio for ³⁰Al₁₃ is 1.307 that of ⁴⁰Ca₂₀ is 1.
But odd no. of protons and neutrons doesnot mean it is not stable, ²³Na₁₁, ²⁷Al₁₃, ⁴⁰Mg₁₈ are some of the examples of stability inspite of odd protons and neutrons numbers.