Unit 8: Hydrogen and its Compounds — Online MCQ Test
CHEMISTRY · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board
Practice Unit 8: Hydrogen and its Compounds with a free chapter-wise online MCQ test.
This chapter covers: This chapter covers isotopes position in periodic table preparation properties and uses of dihydrogen. Students examine water hardness heavy water structure preparation properties....
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Unit 8: Hydrogen and its Compounds — Important Questions & Answers
Which of the following is the most abundant isotope of hydrogen?
- A. Protium
- B. Deuterium
- C. Tritium
- D. Hydronium
Answer: A. Protium
Protium (¹H) is the most abundant isotope of hydrogen and contains one proton and no neutrons.
Protium (¹H) is the most abundant isotope of hydrogen and contains one proton and no neutrons.
Hydrogen is placed in the periodic table at which position?
- A. Group 1, Period 1
- B. Group 17, Period 2
- C. Group 18, Period 1
- D. Group 2, Period 1
Answer: A. Group 1, Period 1
Hydrogen is placed in Group 1 and Period 1 because it has one electron like alkali metals, though it also shows some unique properties.
Hydrogen is placed in Group 1 and Period 1 because it has one electron like alkali metals, though it also shows some unique properties.
Which of the following is a common use of dihydrogen?
- A. Fuel in rockets
- B. Making table salt
- C. Softening hard water
- D. Preparing limestone
Answer: A. Fuel in rockets
Dihydrogen is used as a rocket fuel because of its very high calorific value and clean combustion.
Dihydrogen is used as a rocket fuel because of its very high calorific value and clean combustion.
Why does hydrogen show anomalous behavior compared to alkali metals?
- A. It has two valence electrons
- B. It can lose, gain, or share an electron
- C. It is a metal in all its compounds
- D. It is always present as an ion in water
Answer: B. It can lose, gain, or share an electron
Hydrogen can behave like alkali metals by losing one electron, or like halogens by gaining one electron, and can also form covalent bonds.
Hydrogen can behave like alkali metals by losing one electron, or like halogens by gaining one electron, and can also form covalent bonds.
In the Solvay process, what is the role of hydrogen peroxide in bleaching?
- A. It acts as a reducing agent and removes color directly
- B. It decomposes to give oxygen, which bleaches by oxidation
- C. It forms a white precipitate with dyes
- D. It neutralizes acids in the colored matter
Answer: B. It decomposes to give oxygen, which bleaches by oxidation
Hydrogen peroxide bleaches by oxidation; it releases oxygen that oxidizes the colored substances to colorless products.
Hydrogen peroxide bleaches by oxidation; it releases oxygen that oxidizes the colored substances to colorless products.