11th Class Chemistry Hydrogen & Its Compounds / हाइड्रोजन और इसके यौगिक Question Bank

done 11th CBSE Chemistry Hydrogen & Its Compounds Total Questions - 24

• question_answer1)
  Hydrogen is regarded as a rogue element in the periodic table. Explain.
  View Solution play_arrow

• question_answer2)
  Elemental hydrogen reacts with other substances only slowly at room temperature. Why?
  View Solution play_arrow

• question_answer3)
  Give one example of a reaction in which dihydrogen acts as a reducing agent and an oxidising agent.
  View Solution play_arrow

• question_answer4)
  Why is dihydrogen gas not preferred in balloons?
  View Solution play_arrow

• question_answer5)
  Account for the following in the preparation of \[{{H}_{2}}{{O}_{2}}\] from barium peroxide \[(Ba{{O}_{2}})\] and dilute \[{{H}_{2}}S{{O}_{4}}\]. (a) A thin paste of hydrated barium peroxide is used instead of anhydrous peroxide. (b) The temperature of the reaction mixture is kept at 0°C. (c) The final solution must be kept slightly acidic.
  View Solution play_arrow

• question_answer6)
  Presence of water is avoided in the preparation of \[{{H}_{2}}{{O}_{2}}\] from \[N{{a}_{2}}{{O}_{2}}\]. Assign reason.
  View Solution play_arrow

• question_answer7)
  Explain the following : (i) Temporary hard water becomes soft on boiling. (ii) Water can extinguish most fires but not petrol fire. (iii) Hard water is softened before being used in boilers.
  View Solution play_arrow

• question_answer8)
  Hydrogen peroxide is used to restore the colour of old oil paintings containing lead oxide. Explain.
  View Solution play_arrow

• question_answer9)
  Why are the melting and boiling points of heavy water more than those of ordinary water?
  View Solution play_arrow

• question_answer10)
  A mixture of hydrazine, hydrogen peroxide and Cu(II) catalyst is used as rocket fuel. Why?
  View Solution play_arrow

• question_answer11)
  Is it possible to remove completely the temporary hardness due to \[Mg{{(HC{{O}_{3}})}_{2}}\] by boiling?
  View Solution play_arrow

• question_answer12)
  Is it correct to say that hydrogen can behave as metal? State the condition under which such behaviour is possible.
  View Solution play_arrow

• question_answer13)
  Elements with atomic numbers 17 and 20 form compounds with hydrogen. Write the formulae of the two compounds and compare their chemical behaviour in water.
  View Solution play_arrow

• question_answer14)
  Compare the chemical properties of\[{{H}_{2}}O\]  and\[{{H}_{2}}{{O}_{2}}\].
  View Solution play_arrow

• question_answer15)
  What are the advantages of using hydrogen as a fuel?
  View Solution play_arrow

• question_answer16)
  Why is ice less dense than water? What types of attractive forces must be overcome to melt ice?
  View Solution play_arrow

• question_answer17)
  Explain why phosphoric acid is preferred to sulphuric acid in the preparation of \[{{H}_{2}}{{O}_{2}}\] from hydrated barium peroxide.
  View Solution play_arrow

• question_answer18)
  Hydrogen peroxide acts both as an oxidising agent and as reducing agent in alkaline solution towards certain first row transition metal ions. Illustrate both these properties of \[{{H}_{2}}{{O}_{2}}\] using chemical equation.
  View Solution play_arrow

• question_answer19)
  Why cannot water be used to extinguish petrol fire?
  View Solution play_arrow

• question_answer20)
  Which isotope of hydrogen is used as a tracer in organic reactions.
  View Solution play_arrow

• question_answer21)
  Name one example of a reaction in which dihydrogen acts (i) as an oxidising agent and (ii) as a reducing agent.
  View Solution play_arrow

• question_answer22)
  Name one reaction in which water acts (i) as an oxidising agent and (ii) as a reducing agent.
  View Solution play_arrow

• question_answer23)
  When \[{{H}_{2}}{{O}_{2}}\] is added to blood, rapid evolution of a gas occurs. Explain.
  View Solution play_arrow

• question_answer24)
  Presence of water is avoided in the preparation of \[{{H}_{2}}{{O}_{2}}\] from \[N{{a}_{2}}{{O}_{2}}\]. Explain.
  View Solution play_arrow