Measurement of Matter — Practice Quiz
Maharashtra Board · Class 9 · Science
Try a 4-question quiz on Measurement of Matter for Maharashtra Board Class 9 Science: tap an answer to check it and see why.
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Quick Quiz: Measurement of Matter
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According to the law of conservation of matter, what happens to the total mass during a chemical reaction?
What is the molecular mass of water (H₂O)? (Given: H = 1u, O = 16u)
What is Avogadro's number?
The valency of sodium (Na) is:
Sample Questions
Which of the following are basic radicals?
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Na⁺, Ca²⁺, NH₄⁺
Basic radicals are positively charged ions (cations). Na⁺, Ca²⁺, and NH₄⁺ are all positively charged, while Cl⁻, SO₄²⁻, and OH⁻ are negatively charged acidic radicals.
Which scientist is known as the father of modern chemistry?
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Antoine Lavoisier
Antoine Lavoisier is known as the father of modern chemistry. He discovered the law of conservation of mass and made significant contributions to chemical nomenclature.
Which of the following represent compounds?
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H₂O, NaCl, CO₂
Compounds are formed by chemical combination of different elements. H₂O, NaCl, and CO₂ contain different elements, while O₂ and N₂ are molecules of the same element.
How many grams make one mole of carbon dioxide (CO₂)? (Given: C = 12u, O = 16u)
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44 g
Molecular mass of CO₂ = 12 + (2 × 16) = 12 + 32 = 44 u. One mole of any substance has mass in grams equal to its molecular mass in u.
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