CBSE Class 11 Chemistry Hydrogen MCQs

Question: Hydrogen molecules differs from chlorine molecule in the following respect

• a) Hydrogen molecule cannot participate in coordination bond formation but chlorine molecule can
• b) Hydrogen molecule can form intermolecular hydrogen bonds but chlorine molecule does not
• c) Hydrogen molecule is polar while chlorine molecule is non-polar
• d) Hydrogen molecule is non-polar but chlorine molecule is polar

Answer: Hydrogen molecule cannot participate in coordination bond formation but chlorine molecule can

Question: Hydrogen can behave as a metal

• a) at very high pressure
• b) at very low pressure
• c) at very low temperature
• d) at very high temperature

Answer: at very high pressure

Question: The property of hydrogen which distinguishes it from alkali metals is

• a) its non-metallic character
• b) its reducing character
• c) its affinity for non metal
• d) its electropositive character

Answer: its non-metallic character

Question: 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: 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: 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: 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: 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: 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: 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

More Questions............................

Question: 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: 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: Which of the following metal evolves hydrogen on reacting with cold dilute HNO₃ ?

• a) Mg
• b) Al
• c) Fe
• d) Cu

Answer: Mg

Question: Hydrogen is evolved by the action of cold dil. HNO₃ on

• a) Mn
• b) Al
• c) Fe
• d) Cu

Answer: Mn

Question: In Bosch’s process which gas is utilised for the production of hydrogen gas ?

• a) Water gas
• b) None of these
• c) Producer gas
• d) Coal gas

Answer: Water gas

Question: Hydrogen is not obtained when zinc reacts with

• a) Cold water
• b) dil. HCl
• c) Both
• d) None of these

Answer: Cold water

Question: 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: 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

Question: Which of the following is formed on reaction of carbon monoxide gas with dihydrogen in presence of cobalt as a catalyst?

• a) Methanol
• b) Formic acid
• c) Methanal
• d) Methane

Answer: Methanol

Question: Which of the following is not a use of dihydrogen ?

• a) It used in the synthesis of hydroquinone and tartaric acid
• b) None of these
• c) Atomic hydrogen and oxy-hydrogen torches are used for cutting and welding purposes
• d) It used in fuel cells for generating electrical energy

Answer: It used in the synthesis of hydroquinone and tartaric acid