Preparation of Dihydrogen & H2 - Class 11 Chemistry MCQ

This set of Class 11 Chemistry Chapter 9 Multiple Choice Questions & Answers (MCQs) focuses on “Preparation of Dihydrogen & H₂”.

1. Which of the following mixture is known as water gas?
a) HCL
b) Oxygen and carbon dioxide
c) Hydrogen and deuterium
d) Carbon monoxide and hydrogen
View Answer

Answer: d
Explanation: The mixture of carbon monoxide and hydrogen produced by a synthetic gas is known as water gas. This is from the water gas shift reaction, which was created by a physicist from Italy. Water gas is made by blowing steam through white-hot coke.

2. What is the process of producing syngas from coal known as?
a) coal gasification
b) metal gasification
c) iron gasification
d) zinc gasification
View Answer

Answer: a
Explanation: As the mixture of carbon monoxide and hydrogen is used for the synthesis of methanol and a number of Hydrocarbons, it is called synthesis gas or syngas. The process of reducing syngas from coal is known as coal gasification.

3. What are the products in the water gas shift reaction?
a) carbon dioxide and hydrogen
b) water and carbon dioxide
c) carbon monoxide and hydrogen
d) water and carbon monoxide
View Answer

Answer: a
Explanation: At 773 Kelvin in the presence of ferric oxide and chromium oxide, the water gas (carbon monoxide and hydrogen) along with steam is transformed into carbon dioxide and hydrogen. This is also known as bosch process.

4. Pure zinc is not used in the production of hydrogen.
a) True
b) False
View Answer

Answer: a
Explanation: In the process of preparation of dihydrogen, pure zinc is not used because it reacts slowly. Some impurities presence increases the rate of reaction due to the formation of electrochemical couples.

5. What are the reactants and Lane’s process?
a) iron and oxygen
b) hydrogen and oxygen
c) oxygen and water
d) iron and steam
View Answer

Answer: d
Explanation: In Lane’s process from superheated steam, iron filings are passed over and heated to about 1023 to 1073 Kelvin when hydrogen is formed. The concerned reaction is 3Fe + 4H₂O → Fe₃O₄ + 4H₂ at 1023-1073 K.

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6. What is sodium zincate made of?
a) Sodium and oxygen
b) Sodium, zinc, and oxygen
c) Zinc and oxygen
d) Sodium and zinc
View Answer

Answer: b
Explanation: When zinc is reacted with sodium hydroxide in the presence of heat Sodium zincate and hydrogen are formed the chemical formula of sodium zincate is Na₂ZnO₂. Therefore Sodium Zincate is made of sodium, zinc, and oxygen.

7. The highly pure hydrogen is obtained when?
a) Water gas shift reaction occurs
b) Lane’s process
c) Electrolysed with barium hydroxide solution
d) Hydrogen sulfate is reacted with zinc
View Answer

Answer: c
Explanation: Highly pure dihydrogen (H₂) that is greater than 99.95% is obtained by electrolysis in warm aqueous barium hydroxide (BaOH_(aq)) solution between Nickel electrodes (Ni). This is one of the processes of commercial production of hydrogen.

8. Nickel and chromium actors a catalyst in case of hydrogen production from hydrocarbons.
a) true
b) false
View Answer

Answer: a
Explanation: The commercial production of hydrogen from hydrocarbons by partial oxidation occurs when Nickel and chromium act as a catalyst at 1270 Kelvin, the natural gas in steam is transformed into carbon monoxide and hydrogen.

9. What is a brine solution?
a) salt
b) salt water
c) sweet
d) sweet water
View Answer

Answer: b
Explanation: A Brine solution is nothing but water that has dissolved salt in it hydrogen is obtained as a byproduct in the manufacture of sodium hydroxide and chlorine by the electrolysis of brine solution (salt water).

10. Reduction occurs at the anode.
a) true
b) false
View Answer

Answer: b
Explanation: Reduction is a process of gain of electrons and oxidation is a process of loss of electrons. In the electrolysis of acidified water, the reduction occurs at the cathode and oxidation occurs at the anode, the overall process is regarded as ionization in electrolysis.

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