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Chemistry Board Exam February 2020
15 Questions
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Chemistry Board Exam February 2020

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Questions and Answers

Which of the following hydrides is NOT a reducing agent?

  • $H_2Te$
  • $H_2Se$
  • $H_2O$ (correct)
  • $H_2S$
  • The gas evolved when calcium reacts with water is:

  • Hydrogen (correct)
  • Oxygen
  • Carbon dioxide
  • Nitrogen
  • Which of the following is a synthetic polymer?

  • Terylene (correct)
  • Linen
  • Silk
  • Jute
  • During oxidation of ferrous sulphate using a dilute mixture of nitric and sulphuric acids, the product formed is:

    <p>Ferric sulphate</p> Signup and view all the answers

    The chemical formula of gypsum is:

    <p>$CaSO_4.2H_2O$</p> Signup and view all the answers

    In the reaction of H2SO4 and potassium dichromate, the oxidation state of chromium changes from _______.

    <p>+6 to +2</p> Signup and view all the answers

    The chemical name of common salt is:

    <p>Sodium chloride</p> Signup and view all the answers

    Identify the complex ion in which the effective atomic number of the central metal ion is 35.

    <p>[Zn(NH3)4]2+</p> Signup and view all the answers

    The conversion of methyl chloride into methyl fluoride is known as _______.

    <p>Swarts reaction</p> Signup and view all the answers

    How many moles of methyl iodide are required to prepare tetramethyl ammonium iodide from 1 mole of methyl amine?

    <p>4</p> Signup and view all the answers

    Which reagent, when reacted with glucose, confirms the presence of five hydroxyl groups?

    <p>Acetic anhydride</p> Signup and view all the answers

    Identify the antibiotic drug amongst the following:

    <p>Penicillin</p> Signup and view all the answers

    How many atoms are there per unit cell of a body-centered cube?

    <p>2</p> Signup and view all the answers

    Calculate the work done during the reactions represented by the following thermochemical equation at 300 K: CH4 + 2O2 CO2 + 2H2O (g)(g)(g)(l) (R = 8.314 JK–1 mol–1)

    <p>+4.988 kJ</p> Signup and view all the answers

    What is the concentration of dissolved oxygen at 50ï‚°C under a pressure of one atmosphere if the partial pressure of oxygen at 50ï‚°C is 0.14 atm?

    <p>1.08 x 10^-3 mol dm^-3</p> Signup and view all the answers

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