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

The chemical formula of gypsum is:

<p>$CaSO_4.2H_2O$ (D)</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 (A)</p> Signup and view all the answers

The chemical name of common salt is:

<p>Sodium chloride (A)</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+ (D)</p> Signup and view all the answers

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

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

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

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

Identify the antibiotic drug amongst the following:

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

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

<p>2 (A)</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 (C)</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 (C)</p> Signup and view all the answers

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