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SREE SARAVANA NIKETAN MATRIC HR .SEC,, SCHOOL NERINJIPETTAI, ERODE (DT), CLASS: XI- STD SUBJECT: CHEMISTRY, Answer all the questions, PART -I 5x2 =10, , 1. Distinguish between oxidation and, reduction., , 2. Give the electronic configuration of Mn?*, (Z=25)and Cr°*(Z=24), , 3. State Heisenberg’s uncertainty principle., , 4. Why is covalent radius shorter than the, actual atomic radius?, , 5. Mention the uses of plaster of Paris., PART - Il 5x3=15, , 6. State ( n+l ) rule., , 7. Electron affinity of Be(Z=4) and N(Z=7) have, zero. Give reason., , 8. Discuss briefly the similarities between, lithium and Magnesium., , 9. State and explain Pauli’s exclusion principle., , 10. What are limiting agent and excess agent?