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HESI Chemistry Questions and Answers | Latest Version | 2025/2026 | Correct & Verified

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HESI Chemistry Questions and Answers | Latest Version | 2025/2026 | Correct & Verified What is the lightest alkali metal? Lithium What is the chemical symbol for phosphorus? P What is the oxidation state of chlorine in NaCl? -1 What element is used in matchstick heads for ignition? Phosphorus What gas smells like rotten eggs? Hydrogen sulfide 2 What element is found in both water and most acids? Hydrogen What is the only liquid metal at room temperature? Mercury What gas makes up about 78% of Earth’s atmosphere? Nitrogen What is the heaviest naturally occurring halogen? Iodine What is the formula of hydrochloric acid? HCl What alkali metal reacts most violently with water? Francium 3 What is the formula of carbon dioxide? CO2 What transition metal is used in stainless steel? Chromium What is the common name for Ca(OH)2? Slaked lime What gas turns limewater milky? Carbon dioxide What compound is formed when sulfur burns in oxygen? Sulfur dioxide What is the oxidation state of sodium in Na2O? +1 4 What is the color of chlorine gas? Yellow-green What gas is produced when zinc reacts with hydrochloric acid? Hydrogen What element has the symbol K? Potassium What is the oxidation state of iron in Fe2O3?

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HESI Chemistry Questions and
Answers | Latest Version | 2025/2026 |
Correct & Verified

What is the lightest alkali metal?


✔✔Lithium




What is the chemical symbol for phosphorus?


✔✔P




What is the oxidation state of chlorine in NaCl?


✔✔-1




What element is used in matchstick heads for ignition?


✔✔Phosphorus




What gas smells like rotten eggs?


✔✔Hydrogen sulfide



1

, What element is found in both water and most acids?


✔✔Hydrogen




What is the only liquid metal at room temperature?


✔✔Mercury




What gas makes up about 78% of Earth’s atmosphere?


✔✔Nitrogen




What is the heaviest naturally occurring halogen?


✔✔Iodine




What is the formula of hydrochloric acid?


✔✔HCl




What alkali metal reacts most violently with water?


✔✔Francium

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