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

 

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