Study of the First Element - Hydrogen
ICSE · Class 9 · Chemistry
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What is the atomic number of hydrogen?
What happens when sodium reacts with cold water?
Which metal is preferred for laboratory preparation of hydrogen from acids?
What is the molecular formula of hydrogen gas?
Sample Questions
Which groups does hydrogen resemble due to its dual nature?
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Group IA (Alkali metals), Group VIIA (Halogens)
Hydrogen shows dual nature - it resembles alkali metals (Group IA) because both have one valence electron, and halogens (Group VIIA) because both need one electron to complete their outer shell.
Hydrogen burns with a 'pop' sound when mixed with air.
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True
When hydrogen mixed with air (oxygen) is ignited, it burns explosively with a characteristic 'pop' sound. This is the test for hydrogen gas.
Arrange the following in order of increasing reactivity with water: Iron, Sodium, Zinc, Potassium
Which acids can be used for laboratory preparation of hydrogen? (Select all correct)
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Dilute hydrochloric acid, Dilute sulphuric acid
Only dilute HCl and dilute H₂SO₄ are used. Nitric acid is not used because it's a strong oxidizing agent and oxidizes the hydrogen produced back to water.
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