Question : Stalactites and Stalagmites form due to the precipitation of:
Option 1: CaCO3
Option 2: CaCl2
Option 3: MgCl2
Option 4: MgCO3
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Correct Answer: CaCO3
Solution : The correct option is CaCO3.
Stalactites and stalagmites form in caves due to the precipitation of calcium carbonate (CaCO3). Rainwater, slightly acidic from absorbing carbon dioxide, dissolves calcium carbonate as it seeps through rocks. This dissolved mineral is deposited inside a cave when the water drips from the ceiling and forms stalactites. On the cave floor, the deposited mineral forms stalagmites as water droplets containing dissolved calcium carbonate evaporate and leave the mineral behind.
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Question : Which of the following metal salts is responsible for permanent hardness in water?
Option 1: KCl
Option 2: Nacl
Option 3: Ca(HCO3)2
Option 4: CaCl2
Question : Which among the following has the highest boiling point?
Option 1: NaCl
Option 2: CaO
Option 3: CaCl2
Option 4: LiCl
Question : The buffer action of blood is due to the presence of:
Option 1: HCl and NaCl
Option 2: Cl- and CO32-
Option 3: Cl- and HCO-3
Option 4: HCO3- and H2CO3
Question : The chemical formula of washing soda is
Option 1: Na2So4 .10H2O
Option 2: NaHCO3
Option 3: Na2CO3.10H2O
Option 4: Ca(OH)2
Question : The chemical formula of acetic acid is
Option 1: CH3COH
Option 2: CH3COOH
Option 3: CH3COCH3
Option 4: CH2COOH
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