Class 11 Chemistry MCQ Chapter 9 Hydrogen
Are you preparing for your AHSEC Chemistry examination and searching for Class 11 Chemistry MCQ Chapter 9 Hydrogen English Medium? Then this article is the perfect place to practice important multiple-choice questions and improve your understanding of the chapter.
The chapter Hydrogen introduces students to the properties, preparation, uses, and importance of hydrogen, the lightest and most abundant element in the universe. It covers topics such as the position of hydrogen in the periodic table, isotopes of hydrogen, hydrides, water, hydrogen peroxide, and the role of hydrogen as a clean source of energy. These concepts are important for both theoretical and objective examinations.
All MCQs are prepared according to the latest AHSEC syllabus and examination pattern. The questions are designed to help students revise important facts, understand key concepts, and gain confidence before examinations. Regular practice can improve accuracy and make revision faster and more effective.
Whether you are preparing for school tests, annual exams, or the AHSEC HS First Year Final Examination, these MCQ solutions will help you strengthen your Chemistry preparation and achieve better results.
Part II
Class 11 Chemistry MCQ Chapter 9 Hydrogen
Selected VSA & MCQ
I. Very Short Answer Questions (VSA)
Q: Which is the lightest element in the periodic table?
Ans: Hydrogen is the lightest element in the periodic table.
Q: Why is hydrogen placed separately in the periodic table?
Ans: Hydrogen shows similarities with both alkali metals and halogens, so it is placed
separately in the periodic table.
Q: Name the isotopes of hydrogen.
Ans: The isotopes of hydrogen are protium, deuterium and tritium.
Q: Which isotope of hydrogen does not contain neutron?
Ans: Protium does not contain any neutron.
Q: Which isotope of hydrogen is radioactive?
Ans: Tritium is radioactive.
Q: What is hydride?
Ans: Hydrides are binary compounds of hydrogen with other elements.
Q: Name the three types of hydrides.
Ans: The three types of hydrides are ionic hydrides, covalent hydrides and metallic
hydrides.
Q: What are ionic hydrides?
Ans: Ionic hydrides are compounds formed between hydrogen and highly electropositive
metals.
Q: Give one example of an ionic hydride.
Ans: Sodium hydride ((NaH)) is an example of an ionic hydride.
Q: What are covalent hydrides?
Ans: Covalent hydrides are compounds in which hydrogen forms covalent bonds with
non-metals.
Q: What are metallic hydrides?
Ans: Metallic hydrides are compounds formed by hydrogen with transition metals and
inner transition metals.
Q: Why is hydrogen called a clean fuel?
Ans: Hydrogen is called a clean fuel because it produces only water on combustion.
Q: What is water gas?
Ans: Water gas is a mixture of carbon monoxide and hydrogen.
Q: What is the composition of water gas?
Ans: Water gas contains carbon monoxide and hydrogen in approximately equal
proportions.
Q: What is syngas?
Ans: Syngas is a mixture of carbon monoxide and hydrogen used in industrial processes.
Q: What is the use of hydrogen in the Haber process?
Ans: Hydrogen is used for the manufacture of ammonia in the Haber process.
Q: What is the use of hydrogen in hydrogenation of oils?
Ans: Hydrogen is used to convert unsaturated vegetable oils into saturated fats.
Q: State one use of heavy water.
Ans: Heavy water is used as a moderator in nuclear reactors.
Q: Why does ice float on water?
Ans: Ice floats on water because its density is lower than that of liquid water.
Q: What is hydrogen bonding?
Ans: Hydrogen bonding is the weak attractive force between hydrogen atom and highly
electronegative atoms like oxygen, nitrogen or fluorine.
Q: Why does water have high boiling point?
Ans: Water has high boiling point due to the presence of intermolecular hydrogen
bonding.
Q: What is hard water?
Ans: Hard water is water that does not produce lather easily with soap due to dissolved
salts of calcium and magnesium.
Q: What is temporary hardness of water?
Ans: Temporary hardness is caused by the bicarbonates of calcium and magnesium
dissolved in water.
Q: What is permanent hardness of water?
Ans: Permanent hardness is caused by chlorides and sulphates of calcium and
magnesium dissolved in water.
Q: How can temporary hardness of water be removed?
Ans: Temporary hardness can be removed by boiling the water.
Q: Name one method for removing permanent hardness of water.
Ans: Permanent hardness can be removed by ion-exchange method.
Q: What is the role of hydrogen in fuel cells?
Ans: Hydrogen is used as a fuel in fuel cells to produce electricity.
Q: Why is hydrogen considered an important future fuel?
Ans: Hydrogen is considered an important future fuel because it is non-polluting and has
high calorific value.
Q: What is nascent hydrogen?
Ans: Nascent hydrogen is the freshly liberated atomic hydrogen having high reactivity.
Q: Name one reducing property of hydrogen.
Ans: Hydrogen reduces metal oxides to metals.
Q: Give one industrial use of hydrogen.
Ans: Hydrogen is used in the manufacture of ammonia.
Q: Which gas is evolved when metals react with dilute acids?
Ans: Hydrogen gas is evolved when metals react with dilute acids.
Q: Why is hydrogen not placed in Group 1 permanently?
Ans: Hydrogen differs from alkali metals in many physical and chemical properties, so it
is not placed permanently in Group 1.
II. Multiple Choice Questions (MCQs)
Q: Which is the lightest element in the periodic table?
(a) Helium
(b) Lithium
(c) Hydrogen
(d) Oxygen
Ans: (c) Hydrogen
Q: Hydrogen resembles alkali metals because it —
(a) Gains one electron
(b) Has one electron in outermost shell
(c) Has two electrons
(d) Is a noble gas
Ans: (b) Has one electron in outermost shell
Q: Which isotope of hydrogen has no neutron?
(a) Deuterium
(b) Tritium
(c) Protium
(d) Hydronium
Ans: (c) Protium
Q: Which isotope of hydrogen is radioactive?
(a) Protium
(b) Deuterium
(c) Tritium
(d) Hydride
Ans: (c) Tritium
Q: Heavy hydrogen is known as —
(a) Tritium
(b) Protium
(c) Deuterium
(d) Hydronium
Ans: (c) Deuterium
Q: Hydrides are compounds of hydrogen with —
(a) Metals only
(b) Non-metals only
(c) Noble gases only
(d) Other elements
Ans: (d) Other elements
Q: Heavy water is used as —
(a) Fertiliser
(b) Catalyst
(c) Moderator in nuclear reactors
(d) Oxidising agent
Ans: (c) Moderator in nuclear reactors
Q: Hydrogen is called a clean fuel because it produces —
(a) Carbon dioxide
(b) Sulphur dioxide
(c) Water
(d) Nitrogen dioxide
Ans: (c) Water
Q: Water gas is a mixture of —
(a) Hydrogen and oxygen
(b) Carbon monoxide and hydrogen
(c) Carbon dioxide and methane
(d) Nitrogen and hydrogen
Ans: (b) Carbon monoxide and hydrogen
Q: Hydrogen is used in Haber process for the manufacture of —
(a) Nitric acid
(b) Sulphuric acid
(c) Ammonia
(d) Methane
Ans: (c) Ammonia
Q: Vegetable oils are hydrogenated to form —
(a) Alcohols
(b) Saturated fats
(c) Sugars
(d) Acids
Ans: (b) Saturated fats
Q: Which property of water is due to hydrogen bonding?
(a) Low boiling point
(b) Low density
(c) High boiling point
(d) High conductivity
Ans: (c) High boiling point
Q: Ice floats on water because —
(a) Ice is heavier
(b) Ice has lower density
(c) Water freezes rapidly
(d) Ice contains air
Ans: (b) Ice has lower density
Q: Hard water contains salts of —
(a) Sodium and potassium
(b) Calcium and magnesium
(c) Iron and copper
(d) Zinc and lead
Ans: (b) Calcium and magnesium
Q: Temporary hardness of water is caused by —
(a) Chlorides of calcium and magnesium
(b) Sulphates of calcium and magnesium
(c) Bicarbonates of calcium and magnesium
(d) Nitrates of sodium and potassium
Ans: (c) Bicarbonates of calcium and magnesium
Q: Permanent hardness of water is caused by —
(a) Bicarbonates
(b) Carbonates
(c) Chlorides and sulphates
(d) Hydroxides
Ans: (c) Chlorides and sulphates
Q: Temporary hardness can be removed by —
(a) Filtration
(b) Distillation
(c) Boiling
(d) Sublimation
Ans: (c) Boiling
Q: Which method is used to remove permanent hardness of water?
(a) Boiling
(b) Sedimentation
(c) Ion-exchange method
(d) Filtration
Ans: (c) Ion-exchange method
Q: Which gas is evolved when zinc reacts with dilute hydrochloric acid?
(a) Oxygen
(b) Chlorine
(c) Hydrogen
(d) Nitrogen
Ans: (c) Hydrogen
Q: Hydrogen reacts with chlorine to form —
(a) Water
(b) Hydrogen peroxide
(c) Hydrogen chloride
(d) Sodium chloride
Ans: (c) Hydrogen chloride
Q: Nascent hydrogen is —
(a) Molecular hydrogen
(b) Freshly liberated atomic hydrogen
(c) Liquid hydrogen
(d) Heavy hydrogen
Ans: (b) Freshly liberated atomic hydrogen
Q: Which of the following is a reducing property of hydrogen?
(a) Formation of acids
(b) Reduction of metal oxides
(c) Formation of salts
(d) Production of oxygen
Ans: (b) Reduction of metal oxides
Q: Hydrogen bonding occurs when hydrogen is attached to —
(a) Electropositive atoms
(b) Noble gases
(c) Highly electronegative atoms
(d) Metals only
Ans: (c) Highly electronegative atoms
Q: Which of the following is used in fuel cells?
(a) Oxygen only
(b) Nitrogen only
(c) Hydrogen
(d) Chlorine
Ans: (c) Hydrogen
Q: Assertion (A): Hydrogen is placed separately in the periodic table.
Reason (R): Hydrogen shows similarities with both alkali metals and halogens.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Ans: (a) Both A and R are true and R is the correct explanation of A
Q: Assertion (A): Tritium is radioactive.
Reason (R): Tritium contains two neutrons in its nucleus.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Ans: (a) Both A and R are true and R is the correct explanation of A
Q: Assertion (A): Water has unusually high boiling point.
Reason (R): Water molecules are associated through hydrogen bonding.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Ans: (a) Both A and R are true and R is the correct explanation of A
Q: Assertion (A): Ice floats on water.
Reason (R): Density of ice is lower than that of water.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Ans: (a) Both A and R are true and R is the correct explanation of A
Q: Assertion (A): Temporary hardness of water can be removed by boiling.
Reason (R): Temporary hardness is caused by bicarbonates of calcium and magnesium.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Ans: (a) Both A and R are true and R is the correct explanation of A
Q: Assertion (A): Hydrogen is called a clean fuel.
Reason (R): Combustion of hydrogen produces water.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Ans: (a) Both A and R are true and R is the correct explanation of A
Q: Assertion (A): Heavy water is represented by (D_2O).
Reason (R): Heavy water contains deuterium instead of ordinary hydrogen.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Ans: (a) Both A and R are true and R is the correct explanation of A. 0 0 0
