Chemistry Mcqs 01
1. Which of the following is a noble gas?OxygenNitrogenArgonHydrogenC) Argon Argon is a noble gas found in Group 18 of the periodic table.
What is the chemical formula of water?H2OCO2NaCl CH4 A) H2OWater is composed of two hydrogen atoms and one oxygen atom.
Which acid is present in vinegar?Citric acidHydrochloric acidAcetic acidSulphuric acidC) Acetic acidVinegar is a dilute solution of acetic acid in water.
The atomic number of carbon is:268 12: B) 6 Carbon has 6 protons, defining its atomic number.
Which of the following is an alkali metal? CalciumSodium Aluminum Zinc: B) Sodium Sodium is in Group 1, the alkali metals.
Which element is liquid at room temperature? Mercury Iron CopperLeadA) MercuryMercury is the only metal that is liquid at room temperature.
What is the pH of pure water? 15 79C) 7Pure water is neutral with a pH of 7.
Which gas turns limewater milky?OxygenNitrogen Carbon dioxide Hydrogen C) Carbon dioxide Carbon dioxide reacts with limewater to form calcium carbonate, turning it milky.
Which of the following is a mixture?Water Carbon dioxide Air Glucose: C) Air Air is a mixture of various gases.
What is the symbol of Potassium? PoP PtKD) KThe symbol 'K' comes from the Latin name 'Kalium'.
Which bond is strongest? IonicCovalent Metallic Hydrogen B) CovalentCovalent bonds involve the sharing of electron pairs and are generally stronger.
Which element is used in pencils?Lead Graphite Carbon ZincB) GraphitePencils use graphite, a form of carbon.
Which gas is used in balloons?Helium Oxygen Hydrogen NitrogenA) Helium: Helium is safe and lighter than air, ideal for balloons.
What is the main ore of aluminum?BauxiteHematite Galena PyriteA) BauxiteBauxite is the primary source of aluminum.
What is the chemical formula of common salt?Na2CO3 NaCl KCl CaCl2B) NaCl Common salt is sodium chloride (NaCl).