Chemistry · Science General
Common Chemical Compounds and Reactions
1,204 Questions
Common chemical compounds and reactions questions test your knowledge of everyday chemicals, their formulas, and their interactions. Topics include properties of acids and bases, hard water chemistry, and compounds like baking soda and plaster of paris. This section is essential for general science preparation.
Acids and basesPlaster of parisHard water chemistryCommon chemical formulasEveryday chemical reactions
Common Chemical Compounds and Reactions Questions
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Baking soda
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Washing soda
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Caustic soda
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None of these
B
Correct answer
Explanation
Washing soda (sodium carbonate decahydrate) is used in cleaning products and detergents for its ability to soften water and remove grease.
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NaOH
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Na2O
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Na2 CO3
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None of these
C
Correct answer
Explanation
Anhydrous sodium carbonate, often called soda ash, has the formula Na2CO3, lacking the water of crystallization found in washing soda.
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NaOH
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Na2O
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Na2 CO3.10H2O
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None of these
C
Correct answer
Explanation
Washing soda is the decahydrate form of sodium carbonate, represented as Na2CO3.10H2O.
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NaOH
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Na2O
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Na2 CO3
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None of these
A
Correct answer
Explanation
Sodium hydroxide is a strong base with the chemical formula NaOH.
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Baking soda
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Caustic soda
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Washing soda
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None of these
B
Correct answer
Explanation
Sodium hydroxide (NaOH) is commonly referred to as caustic soda due to its corrosive nature.
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Evaporation
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Crystallization
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Sublimation
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None of these
A
Correct answer
Explanation
Common salt is obtained from seawater primarily through the process of evaporation, where water is removed, leaving the salt behind.
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Sodium Carbonate
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Sodium Chloride
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Sodium Hydroxide
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None of these
B
Correct answer
Explanation
Common salt is chemically known as sodium chloride (NaCl).
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a, b, c and d
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a, b and c
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a, b and c
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a and b
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a and d
C
Correct answer
Explanation
This is the correct answer as common salt, magnesium and bromine are found in ocean water.
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NaCl
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KCl
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HCl
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None of these
C
Correct answer
Explanation
HCl reacts with crushed eggshell to give a gas which turns lime water milky.
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Calcium bicarbonate
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Calcium acetate
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Calcium gluconate
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Calcium hydroxide
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Calcium carbonate
E
Correct answer
Explanation
This is the correct option. When carbon dioxide is bubbled through limewater, calcium carbonate is formed.
Ca(OH)2 + CO2 --> CaCO3 + H2O
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Magnesium hydroxide
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Magnesium chloride
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Magnesium sulphate
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Magnesium acetate
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Magnesium bromide
A
Correct answer
Explanation
This is the correct option. When magnesium oxide is dissolved in water, magnesium hydroxide is formed.
MgO + H2O --> Mg(OH)2
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Sodium bicarbonate
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Sodium thiosulphate
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Sodium nitrate
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none of these
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calsium and magnesium ions present in hard water.
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potassium and sodium ions present in hard water.
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calcium and sodium ions present in hard water.
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magnesium and potassium ions present in hard water.
A
Correct answer
Explanation
Hard water contains calcium and magnesium ions. When soap is used with hard water, these ions react with soap to form insoluble calcium and magnesium salts of fatty acids, appearing as curdy white precipitates.
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vegetable oil.
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sodium hydroxide.
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sodium chloride.
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All of the above
D
Correct answer
Explanation
Soap is made by saponification, which requires vegetable oil (or animal fat) and a strong base like sodium hydroxide. Sodium chloride is used to salt out the soap from the solution.
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Sodium peroxide
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Sodium carbonate
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Sodium thiosulphate
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Sodium nitrate
D
Correct answer
Explanation
Sodium nitrate is the chemical compound. Sodium nitrate is used as a constituent of fertilizers.