Chemical Science Test Booklet Form

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Questions and Answers

What is the duration of the exam?

  • 3 hours
  • 2 hours (correct)
  • 4 hours
  • 1 hour

How many objective type questions are there in the paper?

  • 100 (correct)
  • 75
  • 125
  • 50

What should students do in the first 5 minutes of the examination?

  • Start answering the questions immediately
  • Ask for additional answer sheets
  • Examine the booklet for any discrepancies (correct)
  • Leave the examination hall

What should students do if they find a faulty booklet during their examination?

<p>Immediately report it to the invigilator (D)</p> Signup and view all the answers

What must students tear off before accessing the question booklet?

<p>Sticker-seal on the edge of the cover page (C)</p> Signup and view all the answers

What happens if a student accepts a booklet without a sticker-seal?

<p>They are given a new booklet immediately (D)</p> Signup and view all the answers

What will happen if a candidate marks their responses anywhere other than the circle on the OMR Sheet?

<p>The responses will not be evaluated (C)</p> Signup and view all the answers

What should be done at the end of the booklet for rough work?

<p>Do rough work at the end of the booklet (D)</p> Signup and view all the answers

What is the consequence of disclosing identity information on the OMR Sheet?

<p>The candidate may get disqualified (C)</p> Signup and view all the answers

What should a candidate do with the original OMR Sheet at the end of the examination?

<p>Return it to the invigilator (D)</p> Signup and view all the answers

What color pen should a candidate use to mark their responses?

<p>Blue/Black ballpoint pen (A)</p> Signup and view all the answers

What is prohibited during the examination in terms of tools or materials?

<p>Use of calculator or log table (B)</p> Signup and view all the answers

Which factor contributes to the magnetic moment besides the spin-only value?

<p>Orbital contribution to the magnetic moment (C)</p> Signup and view all the answers

What is the oxidation-reduction reaction that identifies biological nitrification?

<p>[NH4]+ + 2O2 → [NO3]– + H2O + 2H+ (C)</p> Signup and view all the answers

In an octahedral geometry, what is the Pairing Energy (P) contribution to the Crystal Field Stabilization Energy (CFSE) of a high spin d7 ion?

<p>P (D)</p> Signup and view all the answers

How many Electron Paramagnetic Resonance (EPR) lines are observed in the p-dinitro benzene radical anion?

<p>5 (C)</p> Signup and view all the answers

In which ligand environment is the formation of [Zn–OH]+ more facile at the active site of hydrolytic enzymes?

<p>(B) (A)</p> Signup and view all the answers

What is the order of Crystal Field Splitting Parameter (Δ) from highest to lowest among the given coordination complexes?

<p>[CoF6]3– &gt; [CoF6]4– &gt; [Co(H2O)6]2+ (D)</p> Signup and view all the answers

Which statement is true about the reactivities of chlorine species based on the given Frost diagram?

<p>ClO4– is a stronger oxidizing agent in basic than in acidic medium (B)</p> Signup and view all the answers

Which reaction type is exemplified by 3CH3Li + SbCl3 → (CH3)3Sb + 3LiCl?

<p>Metal-halogen exchange (D)</p> Signup and view all the answers

Which oxides historically were used to prepare oxygen by decomposition?

<p>KO2, BaO2, Na2O (A)</p> Signup and view all the answers

In the context of Pauling's electronegativity scale, which element can hydrogen oxidize?

<p>Carbon (B)</p> Signup and view all the answers

Which molecule does not possess Td symmetry?

<p>$P_4$ (B)</p> Signup and view all the answers

For a copper analysis yielding 42.50% instead of the true 42.92%, what could be the possible reason?

<p>Presence of impurities affecting results (C)</p> Signup and view all the answers

Which compound shows peaks at 234, 236, 238 m/e with intensity (1:2:1) in the mass spectrometry spectrum?

<p>2-Methyl-1,3-butadiene (C)</p> Signup and view all the answers

Which compound exhibits an absorption at 1815 cm^(-1) in the infrared spectrum?

<p>Cyclopropane (B)</p> Signup and view all the answers

In which compound is there only one singlet at 3.7 in the 1H – NMR spectrum?

<p>1,4-Dibromobenzene (D)</p> Signup and view all the answers

What would be the major product of the reaction involving 2-Methyl-1,3-butadiene?

<p>(C) (B)</p> Signup and view all the answers

For which chemical conversion would Dimethyldioxirane (DMDO) in CH2Cl2 be the most suitable reagent/condition?

<p>Dimethyldioxirane (DMDO); CH2Cl2 (C)</p> Signup and view all the answers

Which reagents are correct for the conversion involving Vinylmagnesium?

<p>Vinylmagnesium; (A)</p> Signup and view all the answers

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