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Questions and Answers
What is the atomic number of hydrogen?
What is the atomic number of hydrogen?
How does hydrogen react with metal oxides?
How does hydrogen react with metal oxides?
What is the main product when sulphuric acid reacts with zinc in a laboratory?
What is the main product when sulphuric acid reacts with zinc in a laboratory?
Which gas is produced when hydrogen reacts with chlorine?
Which gas is produced when hydrogen reacts with chlorine?
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What sound is heard when hydrogen burns with oxygen?
What sound is heard when hydrogen burns with oxygen?
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In terms of reactivity, which metal gives hydrogen with water?
In terms of reactivity, which metal gives hydrogen with water?
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Which statement regarding hydrogen is true?
Which statement regarding hydrogen is true?
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What causes the pop sound when hydrogen is burnt?
What causes the pop sound when hydrogen is burnt?
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Why is nitric acid not used for the preparation of hydrogen gas?
Why is nitric acid not used for the preparation of hydrogen gas?
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Which of the following is a correct balanced chemical equation for the reaction of zinc with hydrochloric acid?
Which of the following is a correct balanced chemical equation for the reaction of zinc with hydrochloric acid?
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Which metal liberates hydrogen only when steam is passed over red hot metal?
Which metal liberates hydrogen only when steam is passed over red hot metal?
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Why has helium replaced hydrogen in weather observation balloons?
Why has helium replaced hydrogen in weather observation balloons?
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Study Notes
Hydrogen Properties
- Hydrogen has an atomic number of 1.
- Hydrogen can react with metal oxides to produce metal and water.
Reactions of Hydrogen
- When sulphuric acid reacts with zinc, the main product is hydrogen gas.
- Hydrogen reacts with chlorine to produce hydrogen chloride gas.
Hydrogen Combustion
- When hydrogen burns with oxygen, a popping sound is heard due to the rapid expansion of gases during combustion.
Reactivity of Metals with Hydrogen
- Sodium, Potassium, Calcium, and Barium react with cold water to produce hydrogen gas.
- Iron reacts with steam to produce hydrogen gas.
Hydrogen Facts
- Hydrogen is the most abundant element in the universe.
- Hydrogen is a colorless, odorless, and tasteless gas.
- Hydrogen is a highly flammable gas.
Reasons for Hydrogen's Use
- Hydrogen is used as a fuel for rockets and spacecraft.
- Hydrogen is used in the production of ammonia and methanol.
Reasons for Helium's Use
- Helium has replaced hydrogen in weather observation balloons due to its non-flammable nature.
Reactions of Acids with Zinc
- Zinc reacts with hydrochloric acid to produce zinc chloride and hydrogen gas, the balanced chemical equation is: Zn + 2HCl → ZnCl2 + H2
Nitric Acid
- Nitric acid is not used for the preparation of hydrogen gas because it is an oxidizing agent and reacts with hydrogen to form nitrogen oxides.
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Description
Test your knowledge on Chapter 7 - Hydrogen from Class 8 Chemistry with Selina solutions. Enhance your understanding of the periodic table's first element, Hydrogen, known for being the lightest element. Explore comprehensive study materials and expertly-prepared solutions from BYJU’S.
