In This Post we are providing Chapter-2 Hydrogen NCERT MCQ for Class 11 Chemistry which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.
NCERT MCQ ON HYDROGEN
Question 1: Hydrogen accepts an electron to form inert gas configuration. In this it resembles
- a) halogen
- b) chalcogens
- c) alkali metals
- d) alkaline earth metals
Answer: halogen
Question 2: Which of the following statements is correct ?
- a) It has oxidation number of –1 and +1
- b) It will not be liberated at anode
- c) Hydrogen has same electronegativity as halogens
- d) Hydrogen has same IP as alkali metals
Answer: It has oxidation number of –1 and +1
Question 3: Why does H+ ion always get associated with other atoms or molecules?
- a) Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to small size it cannot exist free.
- b) It resembles both alkali metals and halogens
- c) Its reactivity is similar to halogens
- d) Ionisation enthalpy of hydrogen resembles that of alkali metals
Answer: Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to small size it cannot exist free.
Question 4: Which one of the following is not an isotope of hydrogen ?
- a) Ortho hydrogen
- b) Deuterium
- c) None of these
- d) Tritium
Answer: Ortho hydrogen
Question 5: Number of neutrons in three isotopes of hydrogen, protium, deuterium and tritium respectively is
- a) 0, 1, 2
- b) 2, 1, 0
- c) 2, 0, 1
- d) 1, 1,1
Answer: 0, 1, 2
Question 6: Hydrogen bond energy is equal to
- a) 3-10 kcals
- b) 3-7 cals
- c) 30-70 cals
- d) 30-70 kcals
Answer: 3-10 kcals
Question 7: Which of the following is formed when zinc reacts with sodium hydroxide?
- a) Both
- b) Sodium zincate
- c) Hydrogen gas
- d) None of these
Answer: Both
Question 8: Why is water gas (mixture of CO and H2) also called ‘syn gas’?
- a) Because it is used in the synthesis of methanol and a number of hydrocarbons
- b) None of these
- c) Because it is synthesised from methane gas
- d) Because it is synthesised from sewage, saw – dust, scrap wood etc.
Answer: Because it is used in the synthesis of methanol and a number of hydrocarbons
Question 9: Which one of the following pairs of substances on reaction will not evolve H2 gas?
- a) Copper and HCl (aqueous)
- b) Sodium and ethyl alcohol
- c) Iron and steam
- d) Iron and H2SO4 (aqueous)
Answer: Copper and HCl (aqueous)
Question 10: Which of the following metal evolves hydrogen on reacting with cold dilute HNO3 ?
- a) Mg
- b) Al
- c) Fe
- d) Cu
Answer: Mg
Question 11: Hydrogen is evolved by the action of cold dil. HNO3 on
- a) Mn
- b) Al
- c) Fe
- d) Cu
Answer: Mn
Question 12: In Bosch’s process which gas is utilized for the production of hydrogen gas ?
- a) Water gas
- b) None of these
- c) Producer gas
- d) Coal gas
Answer: Water gas
Question 13: Hydrogen is not obtained when zinc reacts with
- a) Cold water
- b) dil. HCl
- c) Both
- d) None of these
Answer: Cold water
Question 14: Which one of the following pairs of substances will not produce hydrogen when reacted together?
- a) Copper and conc. nitric acid
- b) Ethanol and metallic sodium
- c) Magnesium and steam
- d) Phenol and metallic sodium
Answer: Copper and conc. nitric acid
Question 15: Very pure hydrogen (99.9) can be made by which of the following processes ?
- a) Reaction of salts like hydrides with water
- b) Electrolysis of water
- c) Mixing natural hydrocarbons of high molecular weight
- d) Reaction of methane with steam
Answer: Reaction of salts like hydrides with water