Chemistry-1998-Set I

Q1) Write the MO electronic configuration of a diatomic molecule having a bond order of three? (Marks 1)
Ans.1) 1s2 *1s2 2s2 *2s2 2px2= 2py2 2pz2 (for example – N2)

Q2) What are non-stoichiometric compounds? (Marks 1)
Ans.2) Non-stoichiometric compounds are in which the ratio of the cation’s to the anions is different from that indicated by the chemical formula.

Q3) Complete the nuclear reaction expression? (Marks 1)
Ans.3) 27Co59 (d, p) 27Co60

Q4) Write the IUPAC name of : (Marks 1)

Ans4) 2 – Phenyl propanol.

Q5) Why do noble gases form compounds with fluorine and oxygen only? (Marks 1)
Ans5) Noble gases have very stable configuration and therefore only the most electronegative elements like fluorine and oxygen are able to oxidise them.

Q6) Why is hydrochloric acid not used to acidify a permanganate solution in volumetric estimations of Fe2+ or C2O42- ? (Marks 1)
Ans6) HCl is not used to acidify a permanganate solution is volumetric estimations of Fe2+ or C2O42- because HCl gets oxidised to Cl2 and some quantity of permanganate is used for this.

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