Union Public Service Commission (UPSC) conducts a competitive examination for recruitment and selection of eligible candidates to the post of Geologist, Geophysicist and Chemist Group ‘A’ in GSI and Junior Hydro-geologist (Scientist ‘B’), Group ‘A’ for Central Ground Water Board. Also Read - Inspiring! Meerut Woman Who Left Home To Avoid Forced Marriage Returns As PCS Officer 7 Years Later

Candidates who are preparing for the UPSC Combined Geo-Scientist & Geologists Exam in the forthcoming year, can find out what kind of questions were asked in this exam in the year 2014. Some questions from Chemistry Paper I of UPSC Combined Geo-Scientist & Geologists Exam 2014 are as follows: Also Read - Before Reporting For Duty, This Bengaluru Cop Teaches Children of Migrant Workers Everyday For An Hour

Q.1. Answer all of the following: Also Read - Ready to Send Children Back to School? 78% Parents Say No, Willing to Let Kids Repeat An Academic Year

(a) Discuss the radius ratio rule for predicting structure of ionic crystals.
(b) Discuss the effect of solvent on relative strengths of acids and bases.
(c) Explain why square planar Ni(II) organometallic complexes are stable though they do not obey the 18-electron rule.
(d) What do you mean by packing fraction? Explain how it indicates stability of elements.
(e) Lithium has the highest ionization potential among alkali metals, yet it is the most powerful reducing agent. Explain.
(f) What are the important consequences of lanthanide contraction?

Q.2.(a) The radius of a cation is invariably smaller and that of an anion is invariably larger than that of corresponding atom. Justify with examples.

Q.2.(b) Discuss electronegativity according to Pauling’s approach and Mulliken’s approach.

Q.3.(a) Explain the causes of recurrence of properties of elements at regular interval of atomic numbers, with suitable examples.

Q.3.(b) Explain how atomic orbitals combine to form bonding and anti-bonding molecular orbitals. What are the limitations to such combinations?

Q.3.(c) Discuss the factors influencing electronegativity.

Click here to go through the entire question paper on official website of UPSC.

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