Chemistry Mcqs 03
Atomic mass of hydrogen is:12 3 4 A) 1: Hydrogen’s atomic mass is 1.
Which of these is a base?HClNaOHH2SO4CH3COOH B) NaOH Sodium hydroxide (NaOH) is a strong base.
Which of these metals is most malleable? ZincGold Iron Lead B) Gold Gold is highly malleable and ductile.
Which of these elements is non-metal?IronCopperSulphurSilver C) Sulphur Sulphur is a non-metal.
Which gas is essential for respiration?Oxygen Hydrogen Nitrogen HeliumA) Oxygen Oxygen is needed for cellular respiration.
The formula of methane is:CH4 C2H6C2H4C3H8A) CH4Methane’s formula is CH4.
The process of solid changing directly into gas is:Condensation Sublimation EvaporationMelting B) Sublimation Sublimation is solid → gas directly.
Which of these is an alloy? Brass Iron Silver GoldA) Brass Brass is an alloy of copper and zinc.
Which is known as the universal solvent? Alcohol WaterAcetone EtherB) Water Water can dissolve many substances.
Chemical formula of baking soda is:Na2CO3NaHCO3CaCO3 NaOH B) NaHCO3 Baking soda is sodium bicarbonate.
Which process converts sugar to alcohol?Distillation Fermentation) Filtration SublimationB) Fermentation Fermentation converts sugar to alcohol
The atomic number of helium is:1 2 34 B) 2 Helium has 2 protons.
The green coating on copper is: Copper oxide Copper sulphide Copper carbonate Copper nitrateC) Copper carbonate It forms due to exposure to air and moisture.
Which gas is used for artificial ripening of fruits? Acetylene Ethylene Methane Propane B) Ethylene Ethylene accelerates ripening.
The lightest metal is: AluminumLithiumSodiumMagnesiumB) Lithium Lithium is the lightest metal.