The Language of Chemistry — Important Questions
ICSE · Class 9 · Chemistry
44 important questions from The Language of Chemistry for ICSE Class 9 Chemistry, with answers. Part of the ICSE Class 9 Chemistry syllabus.
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Important Questions from The Language of Chemistry
Which of the following are correct chemical symbols? (Select all that apply)
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Fe for Iron, Au for Gold, Ag for Silver, Ca for Calcium
Fe (from Latin Ferrum), Au (from Latin Aurum), Ag (from Latin Argentum), and Ca are all correct element symbols. Co represents the element Cobalt, not carbon monoxide (which is CO).
The valency of hydrogen is always 1.
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True
Hydrogen has a valency of 1 because it has one electron in its outer shell and can lose, gain, or share one electron during chemical bonding.
Which of the following represent radicals? (Select all that apply)
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NH₄⁺ (Ammonium), SO₄²⁻ (Sulfate), Na⁺ (Sodium), OH⁻ (Hydroxide)
Radicals are atoms or groups of atoms with positive or negative charges. NH₄⁺, SO₄²⁻, Na⁺, and OH⁻ are all charged radicals. H₂O is a neutral molecule, not a radical.
What does a chemical formula represent?
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The molecular composition of a substance
A chemical formula shows the types and numbers of atoms present in a molecule of a compound. It represents the molecular composition and ratios of elements.
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