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WorksheetsChemical Reactions Quiz
Total questions: 18
Worksheet time: 9mins
An example for chemical change among the following is
Dissolving salt in water
Tearing of paper
Rusting of iron
Boiling of water
This is not a property of a chemical reaction among the following.
Change in colour
Release of heat
Change in shape
Release of gas
Fe2O3 + 2Al → Al2O3 +2Fe The above chemical reaction is an example for
Combination reaction
Decomposition reaction
Displacement reaction
Double displacement reaction
The group of reactants among the following which react with each other to exchange ions and form a precipitate is
BaCl2 and Na2SO4
Al2O3 and HCl
NaOH and H2SO4
Na2O and CO2
The evolution of Oxygen and Hydrogen gases in the electrolysis of water is
Double displacement reaction
Exothermic reaction
Displacement reaction
Decomposition reaction
The chemical reaction that takes place when reactants exchange their ions mutually is
Double displacement reaction
Dissociation reaction
Dissociation reaction
Combination reaction
CuO + H2 → Cu+ H2O In this reaction, the reactants that undergo oxidation and reduction respectively are
CuO + H2
H2 + CuO
Cu + H2O
H2O+ Cu
Silver nitrate turns into grey colour in the presence of sunlight because
Silver chloride decomposes to form silver.
Silver chloride decomposes to form chlorine.
Silver chloride undergoes oxidation.
Silver chloride undergoes reduction.
The ratio of hydrogen and oxygen gases released in the electrolysis of water is
Hydrogen : Oxygen:: 1 : 2
Oxygen : Hydrogen:: 2 : 3
Hydrogen : Oxygen :: 2 : 1
Oxygen : Hydrogen:: 3 : 2
The conversion of vegetable waste into compost is an example for
Reduction reaction
Endothermic reaction
Exothermic reaction
Redox reaction
The gas released at the cathode in the electrolysis of water is
Oxygen
Chlorine
Identify the chemical equation in which the chemical reaction takes place in the following
FeSO4 + Pb → PbSO4 +Fe
ZnSO4 + Fe → FeSO4 +Zn
2AgNO3 + Cu → Cu(NO3)2 + Ag
PbCl2+ Cu → CuCl2 + Pb
When dilute hydrochloric acid is added to iron fillings
Hydrogen gas and Iron chloride are produced
Chlorine gas and ferric hydroxide are produced.
No reaction takes place
Ferrous salt and water are produced.
The metal that displaces copper from copper sulphate
Gold
Silver
Copper
Iron
Ferrous sulphate crystals lose their green colour when heated because this compound
Breaks down into simpler compounds
Loses water molecules
Releases sulphur dioxide gas
Produces brown smoke
Chip manufacturers flush bags of chips with nitrogen gas because,
To prevent corrosion
To prevent oxidation
To cause corrosion.
To prevent reduction.
The chemical reaction in which iron undergoes corrosion is
combination and redox reaction.
displacement and redox reaction.
redox and oxidation reaction.
displacement and oxidation reaction.
MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂; Oxidized and reduced compounds in this reaction respectively are,
MnO₂ and HCl
HCl and MnO₂
MnO₂ and H₂O
MnO₂ and Cl₂
