Hydrogen and its Compounds
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Questions and Answers

What is the ionic radius of H⁻ ion in picometers?

  • 250
  • 180
  • 170
  • 210 (correct)

    • What is the minimum temperature required to dissociate dihydrogen into hydrogen atoms?

  • 2000 K (correct)
  • 2500 K
  • 1500 K
  • 1800 K

    • What is the purpose of passing dihydrogen through vegetable oils at about 473 K?

  • To form solid fats (correct)
  • To form hydrogen gas
  • To form hydrogen chloride
  • To form hydrogen peroxide

    • What is the electron affinity of hydrogen in kJ mol⁻¹?

    <p>72.8</p> Signup and view all the answers

    What is the use of dihydrogen in the oxy-hydrogen torch?

    <p>To produce a high temperature of 2500°C</p> Signup and view all the answers

    What is the product formed when dihydrogen reacts with calcium?

    <p>CaH₂</p> Signup and view all the answers

    What is the systematic name of water?

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

    Which of the following metals react with water at room temperature to produce hydrogen?

    <p>Na, K</p> Signup and view all the answers

    What is the product of the reaction between sodium hydride and water?

    <p>Sodium hydroxide and hydrogen</p> Signup and view all the answers

    What is the catalyst used in the Bosch process for the production of dihydrogen?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is a characteristic of hydrogen similar to halogens?

    <p>It forms an anion by gaining one electron</p> Signup and view all the answers

    What is the oxidation state of hydrogen in its compounds?

    <p>-1</p> Signup and view all the answers

    What is the byproduct of the reaction between metal hydride and water?

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

    Which of the following pairs of hydrogen isotopes are harmless?

    <p>Ortho hydrogen and para hydrogen</p> Signup and view all the answers

    What is the role of hydrogen peroxide in the production of spong rubber?

    <p>As an aerating agent</p> Signup and view all the answers

    What is the application of hydrogen peroxide in the detection of certain metal ions?

    <p>It forms peroxides of characteristic colors</p> Signup and view all the answers

    What is the use of hydrogen peroxide in pollution control?

    <p>To restore aerobic conditions of sewage waste</p> Signup and view all the answers

    What is the application of hydrogen peroxide in the synthesis of certain compounds?

    <p>All of the above</p> Signup and view all the answers

    What is the primary characteristic of water that enables it to form hydrates with metal salts?

    <p>Its ability to act as a Lewis base</p> Signup and view all the answers

    What is the term for water molecules that occupy interstitial sites in the crystal lattice of a compound?

    <p>Interstitial water</p> Signup and view all the answers

    What is the value of the ionization constant of water at 25°C?

    <p>1.008 × 10^(-14)</p> Signup and view all the answers

    What is the primary difference between hard and soft water?

    <p>Their concentration of calcium and magnesium ions</p> Signup and view all the answers

    What is a characteristic of water's chemical properties that allows it to act as both an acid and a base?

    <p>Its amphoteric nature</p> Signup and view all the answers

    What is the term for the heat required to change the state of water from liquid to gas at 373K?

    <p>Heat of vaporization</p> Signup and view all the answers

    What is the temperature at which water has maximum density?

    <p>277 K</p> Signup and view all the answers

    Which of the following compounds can be prepared using heavy water (D2O)?

    <p>Deuteriosulphuric acid</p> Signup and view all the answers

    What is the nature of water's chemical reactions?

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

    What is the result of water's hydrolytic reaction with metal oxides?

    <p>Formation of acid and base</p> Signup and view all the answers

    What is the term for the point at which water is in equilibrium with ice and vapour?

    <p>Triple point</p> Signup and view all the answers

    What is the molecular mass of heavy water (D2O)?

    <p>20.028</p> Signup and view all the answers

    What is the primary reason for the high bond dissociation energy of dihydrogen?

    <p>Due to its high ionisation energy</p> Signup and view all the answers

    What is the characteristic of dihydrogen that allows it to react with transition metals?

    <p>Its ability to form interstitial hydrides</p> Signup and view all the answers

    What is the significance of the temperature of 2000 K in the context of dihydrogen?

    <p>It is the temperature at which dihydrogen dissociates into hydrogen atoms</p> Signup and view all the answers

    What is the application of the process of passing dihydrogen through vegetable oils at about 473 K?

    <p>To prepare solid fats</p> Signup and view all the answers

    What is the significance of the ionisation energy of hydrogen?

    <p>It determines its bond dissociation energy</p> Signup and view all the answers

    What is the characteristic of dihydrogen that makes it a useful reducing agent?

    <p>Its high ionisation energy</p> Signup and view all the answers

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