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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KNO3
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KH2PO4
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FeSO4
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MgSO4.7H2O
B
Correct answer
Explanation
Sach's medium does not contain KH2PO4.
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Charcoal
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Alum
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Sand
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Mud
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Sugar
B
Correct answer
Explanation
Minute quantities of alum are added to facilitate sedimentation.
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carbon dioxide is released
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limewater turns milky
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calcium carbonate is formed
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Both 1 and 2
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1, 2 and 3
E
Correct answer
Explanation
Yes, on blowing air in a glass full of limewater through a drinking straw, it is observed that the limewater turns milky. This shows that carbon dioxide is released during exhalation.
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It is a solution containing sugar and salt.
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It is pure mineral water.
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It is a glucose solution.
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It is an energy drink containing minerals and vitamins.
A
Correct answer
Explanation
Yes, it is correct. ORS is a solution of 6 tsp of sugar and 1/2 tsp of salt in 1 litre of water. It is given to diarrhoea patient to compensate for the loss of fluids in the body.
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Graphite
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Magnesium sulphate
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Sodium thiosulphate
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None of these
A
Correct answer
Explanation
Graphite is a non-metal which conducts electricity. Because of this reason, a graphite is used in electrodes of a dry cell.
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potassium
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sodium
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both sodium and potassium
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cobalt, sodium and potassium
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Both (A) and (R) are true and (R) is the correct explanation of (A)
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Both (A) and (R) are true but (R) is not the correct explanation of (A).
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(A) is true but (R) is false.
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(A) is false but (R) is true.
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Air
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Copper sulphate
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Sodium chloride
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Water
A
Correct answer
Explanation
A mixture is a material, which consists of two or more pure substances (elements or compounds) which are not chemically combined but physically mixed in any proportion. The mixture shows the properties of all its constituents and it can be separated into its constituents by using physical method. Air is a homogeneous mixture of many gases like nitrogen (78%), oxygen (21%), carbon dioxide, inert gases and water vapours.
Copper suphate, sodium chloride and water are compounds as they are made up of two or more elements chemically combined in a fixed ratio by mass. Therefore, they have definite compositions.
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Calcium hydroxide
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Calcium sulphate
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Calcium oxychloride
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Slaked lime
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None of these
C
Correct answer
Explanation
Bleaching powder (CaOCl2) is calcium oxychloride. So the given option is correct.
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CaSO4.2H2O
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2CaSO4.H2O
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CuSO4.5H2O
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CuSO4
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None of these
B
Correct answer
Explanation
This is the correct option as molecular formula of Plaster of Paris is 2CaSO4.H2O.
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Plastic
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Car batteries
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Dyes
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TNT (Tri-Nitro Toluene)
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All of the above
E
Correct answer
Explanation
This is the correct option because all of the above are manufactured by mineral acid. Mineral acid is used in the manufacture of TNT (Tri-Nitro Toluene), dyes, car batteries and plastic.
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CuSO4.5H2O
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Na2CO3.10H2O
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CaSO4.2H2O
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FeSO4.7H2O
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None of these
E
Correct answer
Explanation
This is the correct option as all of the above are hydrated salts.
B
Correct answer
Explanation
CaSO4 +4C→CaS+4CO
So, this is a product formed.
CaSO4 +4C→CaS+4CO
So, this is a product formed.
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increases, decrease
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increases, increase
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decreases, decrease
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decreases, increase
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None of these
C
Correct answer
Explanation
Solubility of sulphates of alkaline earth metals decreases down the group due to decrease of hydration energy down the group as increase in cation size down the group is seen.
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Ca2SiO3
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Na2SiO3
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NaAIO3
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AI2O3
B
Correct answer
Explanation
Chemical formula for water glass is Na2SiO3.