Chemistry Mcqs 06
Which element is used in making semiconductors? Iron SiliconAluminum CopperB) Silicon Silicon is widely used in semiconductors.
Which gas is produced when metals react with acid? Oxygen Hydrogen Carbon dioxideNitrogenB) Hydrogen Metals + acid → salt + hydrogen gas.
The main component of natural gas is:MethanePropaneButaneEthaneA) MethaneNatural gas is mainly methane.
Which of these is a reducing agent?OxygenHydrogen Carbon dioxideNitrogenB) Hydrogen Hydrogen reduces other substances.
Which gas is used in electric bulbs? Neon ArgonHydrogen HeliumB) ArgonArgon prevents filament oxidation.
Which is the main component of glass? Silicon dioxide Calcium carbonate Sodium chloride Magnesium oxideA) Silicon dioxideGlass is made from silica.
Which element burns with a dazzling white flame? MagnesiumCopper Zinc IronA) MagnesiumMagnesium burns bright white.
Which is the hardest metal? GoldIron TungstenSilverC) TungstenTungsten has the highest hardness and melting point.
The chemical name of laughing gas is:Nitrous oxideNitric oxideNitrogen dioxideNitrogen pentoxideA) Nitrous oxide N2O is laughing gas.
Which gas turns moist red litmus blue?Ammonia HydrogenOxygenCarbon dioxide A) AmmoniaAmmonia is alkaline and turns red litmus blue.
Which metal is liquid at room temperature?Mercury Lead ZincAluminum A) MercuryMercury is the only metal that is liquid at room temperature.
What is the chemical formula of baking soda? NaCl NaOH NaHCO3Na2CO3C) NaHCO3 Baking soda is sodium bicarbonate (NaHCO3).
Which acid is present in vinegar? Formic acid Citric acidAcetic acidHydrochloric acidC) Acetic acid: Vinegar contains acetic acid.
Which metal is used in thermometers? IronMercury Copper Lead: B) Mercury Mercury is used because it expands uniformly with temperature.
Which element is known as quicksilver? Silver Platinum MercuryLeadC) Mercury Mercury is also called quicksilver.