Tuesday, 13 November 2018

CBSE Class 11 - Chemistry Chapter 9 - Hydrogen - Very Short Questions Answers (VSQA) (#cbsenotes)(#eduvictors)

Class 11 - Chemistry 

Chapter 9 : Hydrogen 

Very Short Questions Answers 

CBSE Class 11 - Chemistry Chapter 9 - Hydrogen - Very Short Questions Answers (VSQA) (#cbsenotes)(#eduvictors)

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.

(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.

(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?

(i)  For synthesis of Ammonia (NH₃)
(ii) For production of Methanol (CH₃OH)
(iii) In oxyhydrogen torches
(iv) In a fuel cell.