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

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