The Present Book On Quantum Mechanics Is Basically Meant For Undergraduate And Post-Graduate Students. The Book Has Been Divided Into Two Parts. The Part I Deal With Theoretical Concepts In Quantum Mechanics While Part Ii Deals With Problems Based On Quantum Mechanics. Most Of The Problems Have Been Taken From Various University Examinations. Si Units Have Been Used. However, At Some Places Old Units Have Been Used So That The Students May Become Familiar With Old As Well As New Units. Throughout This Book, It Is Assumed That The Student Understands The Fundamental Concepts In Physical Chemistry.Written In Simple Language And Coherent Style, This Book Will Prove Vade Mecum To Students And Teachers Alike.