Class 11 - Chemistry
Chapter 9 : Hydrogen
Very Short Questions Answers
Q1: Name the first element of periodic element. What is its electronic configuration?
Answer: Hydrogen is the first element in the periodic table and also the lightest element known. Electronic configuration of Hydrogen is 1s¹.
Q2: Name the three isotopes of hydrogen.
Answer:
(i) Protium (¹H₁)
(ii) Deuterium ( ¹H₂ or ¹D₂)
(iii) Tritium ( ¹H₃ or ¹T₃)
Q3: Which isotope of hydrogen is radioactive?
Answer: Tritium
Q4: How is dihydrogen prepared commercially?
Answer: By electrolysis of acidified water.
Q5: What is the importance of heavy water with regard to nuclear power generation?
Answer: It is used as a moderator and helps to control the nuclear reaction.
Q6: Name the compound whose electrolysis in aqueous state, give high purity (99.95%) dihydrogen.
Answer: aq Ba(OH)₂ solution
Q7: Name the element used in fuel cell for generating electricity.
Answer: H (H₂ gas is used).
Q8: What is a zeolite?
Answer: It is hydrated sodium aluminium silicate, Na₂Al₂Si₂O₈.xH₂O
Q9: Name the hydrides which have high potential for hydrogen storage.
Answer: Metallic hydrides
Q10: Give an example of electron deficient covalent hydride.
Answer: B₂H₆
Q11: Write two uses of interstitial hydrides.
Answer:
(i) In the storage of H₂.
(ii) Catalyst for hydrogenation reaction.
Q12: What type of elements form interstitial hydrides?
Answer: d-block and f-block elements.
Q13: Name the groups in d-block elements which do not form metallic hydrides.
Answer: 7, 8 and 9 group.
Q14: What is perhydrol?
Answer: Perhydrol is the trade name of H₂O₂(hydrogen peroxide) . It is used as an antiseptic.
Q15: Which isotope of hydrogen does not have neutron?
Answer: Protium (¹H₁) does not have neutron.
Q16: What is the use of hydrogen in the manufacture of Vanaspati Ghee?
Answer: H₂ gas is used as reducing agent to convert vegetable oil into vegetable ghee. It is also called hydrogenation.
Q17: Name the phenomenon of adsorption of hydrogen on metal surface.
Answer: Occlusion
Q18: List the uses of dihydrogen?
Answer:
(i) For synthesis of Ammonia (NH₃)
(ii) For production of Methanol (CH₃OH)
(iii) In oxyhydrogen torches
(iv) In a fuel cell.
