Question : Which among the following has the highest boiling point?
Option 1: NaCl
Option 2: CaO
Option 3: CaCl2
Option 4: LiCl
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Correct Answer: CaO
Solution : The correct option is CaO.
CaO (Calcium Oxide) has the highest boiling point at around 2,850 degrees Celsius. CaO exhibits a higher boiling point due to its strong ionic bond arising from a larger charge difference between Ca2+ and O2-, along with a cubic crystal lattice maximizing attractive forces. The boiling points for the others are NaCl (Sodium Chloride) at 1,413 degrees Celsius, CaCl2 (Calcium Chloride) at approximately 1,935 degrees Celsius, and LiCl (Lithium Chloride) at 1,382 degrees Celsius.
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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 : Stalactites and Stalagmites form due to the precipitation of:
Option 1: CaCO3
Option 2: CaCl2
Option 3: MgCl2
Option 4: MgCO3
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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