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Chemical Equations with Solutions mcq for Students
Identify the white precipitate produced when sodium sulphate reacts with barium chloride
A) Sodium oxide
B) Barium hydroxide
C) Sodium chloride
D) Barium sulphate
Option d – Barium sulphate
Calcium hydroxide is the chemical name for which saturated aqueous solution?
A) Black water
B) Hard water
C) Limewater
D) Carbonated water
Option c – Limewater
Why do potato chip makers fill packets with nitrogen gas?
A) To make the packets appear larger for marketing purposes
B) To keep the chips from breaking during transportation
C) To stop the chips from becoming oxidised
D) To prevent bacterial decomposition of the chips
Option c – To stop the chips from becoming oxidised
Select the compound that is NOT formed during the thermal decomposition of lead nitrate.
A) Oxygen
B) Lead oxide
C) Nitrogen dioxide
D) Nitrogen
Option d – Nitrogen
Which of these statements about rusting is accurate?
A) Zinc oxide is a type of rust.
B) Rust is chemically hydrated ferric oxide.
C) Rust is chemically non-hydrated ferric oxide.
D) Copper forms rust when hydrated.
Option b – Rust is chemically hydrated ferric oxide.
Mercury(I) chloride, used as a lab reagent and in dry batteries as a depolarizer, is commonly known as
A) Phosgene
B) Calomel
C) Galena
D) Saltpetre
Option b – Calomel
When an iron nail is immersed in a copper sulphate solution, the colour changes to
A) Blue, green
B) Green, blue
C) Blue, yellow
D) Yellow, blue
Option a – Blue, green
The reaction of calcium carbonate with water and carbon dioxide yields
A) Calcium oxide
B) Calcium hydroxide
C) Calcium hydrogen carbonate
D) Hydrochloric Acid
Option c – Calcium hydrogen carbonate
Choose the correctly matched ion and symbol.
A) Ammonia – OH⁻
B) Cyanide ion – CN⁻
C) Bromide ion – F⁻
D) Fluoride ion – Cl⁻
Option b – Cyanide ion – CN⁻
Which of the following does NOT involve a chemical change?
A) Cleaning clothes with detergent
B) Ripening of mango
C) Colour change of turmeric with soap
D) Cooling effect from nail-polish remover
Option d – Cooling effect from nail-polish remover
Household bleaching agents containing phosphorus, sulphur, or chlorine are formed due to which reaction type?
A) Displacement reaction
B) Decomposition reaction
C) Disproportionation reaction
D) Combination reaction
Option c – Disproportionation reaction
Mixing vinegar and baking soda in a balloon releases which gas, inflating it?
A) Carbon dioxide
B) Oxygen
C) Nitrogen
D) Hydrogen
Option a – Carbon dioxide
Airbags inflate because of which chemical conversion that rapidly produces gas after impact?
A) Sodium azide decomposing to nitrogen gas
B) Solid carbon dioxide turning into gaseous carbon dioxide
C) Carbon dioxide converting to carbon monoxide
D) Sudden change of gaseous carbon dioxide to carbon monoxide
Option a – Sodium azide decomposing to nitrogen gas
Identify the endothermic reaction.
A) CaO(s) + H₂O(l) → Ca(OH)₂(aq)
B) CaCO₃(s) → CaO(s) + CO₂(g)
C) C(s) + O₂(g) → CO₂(g)
D) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l)
Option b – CaCO₃(s) → CaO(s) + CO₂(g)
The reaction of calcium oxide with water to form slaked lime represents a
A) Decomposition reaction
B) Combination reaction
C) Oxidation reaction
D) Addition reaction
Option b – Combination reaction
In the redox reaction 2Cu₂O(s) + Cu₂S(s) → 6Cu(s) + SO₂(g), identify the oxidant and reductant respectively.
A) Cu(I) and S in Cu₂S
B) Cu and S in SO₂
C) Cu and O in SO₂
D) Cu(I) and O in SO₂
Option a – Cu(I) and S in Cu₂S
Which process is an example of an endothermic change?
B) Burning carbon
C) Respiration
D) Photosynthesis
Option d – Photosynthesis
Slaked lime used for whitewashing reacts with a component of air to create a shiny layer. Name components (A) and (B).
A) A – O₂; B – CaCO₃
B) A – CO₂; B – Ca(OH)₂
C) A – O₂; B – Ca(H)₂
D) A – CO₂; B – CaCO₃
Option d – A – CO₂; B – CaCO₃
To examine the alimentary canal by X-ray, which metal Salt is given to the patient?
A) Barium sulphate
B) Barium chloride
C) Strontium sulphate
D) Magnesium chloride
Option a – Barium sulphate
Pick the process that is not an oxidation reaction
A) Butter turning rancid over time
B) Formation of a white precipitate when barium chloride is mixed with sodium sulphate
C) Formation of a reddish-brown coating on iron articles
D) Wine becoming sour
Option b – Formation of a white precipitate when barium chloride is mixed with sodium sulphate
Find the reaction that does not involve oxidation
A) Rusting of iron
B) Opening a soda bottle
C) Combustion
D) Rancidity
Option b – Opening a soda bottle
Burning magnesium ribbon in air produces which correct statements 1. White MgO powder forms 2. It is a combustion reaction 3. Heat and Light are released
A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 2 and 3
Option d – 1, 2 and 3
For the reaction CaO + H₂O → Ca(OH)₂ + Heat, which statements are correct 1. Quicklime is used for whitewashing walls 2. Slaked lime solution is used for whitewashing 3. CaO slowly forms a CaCO₃ layer when exposed to CO₂ 4. Slaked lime is an Inorganic compound
A) 1 and 4 only
B) 2 and 4
C) 2 and 3
D) 1, 3 and 4
Option b – 2 and 4
When lead nitrate is heated, which statements are true 1. Brown NO₂ fumes appear 2. Colorless O₂ gas is given off 3. It is an oxidation reaction 4. It is thermal decomposition producing gas
A) 1 and 2
B) 2, 3 and 4
C) 1, 3 and 4
D) 2 and 4 only
Option d – 2 and 4 only
The rate of an enzyme-catalyzed reaction depends on
A) Substrate concentration, temperature, and pH
B) Only substrate concentration and pH
C) Only pH and temperature
D) Only temperature
Option a – Substrate concentration, temperature, and pH
Select the correctly balanced chemical equation
A) Fe + H₂O → Fe₃O₄ + H₂
B) Fe₄H₀ → Fe₃O₄ + H₂
C) 3Fe + 4H₂O → Fe₃O₄ + 2H₂
D) 3Fe + 4H₂O → Fe₃O₄ + 4H₂
Option c – 3Fe + 4H₂O → Fe₃O₄ + 2H₂
The reaction of CaO with water to produce Ca(OH)₂ is an example of
A) Displacement reaction
B) Endothermic reaction
C) Decomposition reaction
D) Exothermic reaction
Option d – Exothermic reaction
Colour of the precipitate when CO₂ is bubbled through lime water
A) Green
B) Blue
C) White
D) Brown
Option c – White
Identify the process that is not a redox reaction
A) AlCl₃ + 3H₂O → Al(OH)₃ + 3HCl
B) 2NaH → 2Na + H₂
C) 4Fe + 3O₂ → 2Fe₂O₃
D) CuSO₄ + Zn → Cu + ZnSO₄
Option a – AlCl₃ + 3H₂O → Al(OH)₃ + 3HCl
Which of these represents a decomposition reaction
A) CH₄ + 2O₂ → CO₂ + 2H₂O
B) 2AgCl → 2Ag + Cl₂
C) CuO + H₂ → Cu + H₂O
D) Fe + CuSO₄ → FeSO₄ + Cu
Option b – 2AgCl → 2Ag + Cl₂
Compounds that undergo thermal decomposition include
A) Silver oxide and zinc oxide
B) Zinc oxide
C) Silver oxide
D) Magnesium oxide
Option c – Silver oxide
An iron nail turns brown when dipped in copper sulphate due to
A) Addition reaction
B) Decomposition reaction
C) Substitution reaction
D) Displacement reaction
Option d – Displacement reaction
Identify the process that involves a chemical reaction
A) Evaporation of petrol
B) Dissolving Salt in water
C) Storing oxygen gas under pressure
D) Burning magnesium ribbon in air
Option d – Burning magnesium ribbon in air
Which one is an example of oxidation
A) Freezing water
B) Dissolving sugar in water
C) Rusting of iron
D) Boiling petrol
Option c – Rusting of iron
Who introduced the 18th-century concept of combustion as a reaction with oxygen, overturning the phlogiston idea
A) Robert Boyle
B) Antoine Lavoisier
C) Johann Becher
D) Friedrich Wöhler
Option b – Antoine Lavoisier
Pick the chemical equation that is incorrectly balanced
A) 3CaCl₂ + 2Na₃PO₄ → Ca₃(PO₄)₂ + 6NaCl
B) 6HClO₄ + P₂O₅ → 4H₃PO₄ + 6Cl₂O
C) 10KClO₃ + 3P → 3P₂O₅ + 10KCl
D) 3Hg(OH)₂ + 2H₃PO₄ → Hg₃(PO₄)₂ + 6H₂O
Option b – 6HClO₄ + P₂O₅ → 4H₃PO₄ + 6Cl₂O
When an egg is boiled, why does the outside become opaque and white
A) Change in the crystal structure of the yolk
B) Heat alters the structure of egg proteins
C) Reaction of the egg with water makes it opaque
D) Denaturation of albumin causes hardening and whitening
Option d – Denaturation of albumin causes hardening and whitening
The process in which sugar turns into caramel syrup on heating is called
A) Caramelisation
B) Maillard reaction
C) Neutralisation
D) Precipitation
Option a – Caramelisation
In the reactions Zn + CuSO₄ → ZnSO₄ + Cu and Pb + CuCl₂ → PbCl₂ + Cu, copper is displaced because
A) Zinc and lead are unstable as elements
B) Zinc and lead are more reactive than copper
C) Copper compounds break down under pressure
D) Copper is more reactive than zinc and lead
Option b – Zinc and lead are more reactive than copper
The product formed when zinc reacts with sulphuric Acid is
A) Zinc sulphide
B) Zinc oxide
C) Zinc hydroxide
D) Zinc sulphate
Option a – Zinc sulphide
Dilute sulphuric Acid reacting with magnesium releases
A) Oxygen
B) Sulphur dioxide
C) Sulphur trioxide
D) Hydrogen
Option d – Hydrogen
Gas released when zinc reacts with sulphuric Acid is
A) Carbon dioxide
B) Hydrogen
C) Oxygen
D) Hydrogen sulphide
Option b – Hydrogen
A reaction whose rate is limited when the catalyst surface is saturated is termed
A) First-order reaction
B) Second-order reaction
C) Zero-order reaction
D) Third-order reaction
Option c – Zero-order reaction
Passing Electricity through water results in which chemical reaction
A) Combination
B) Displacement
C) Decomposition
D) Double displacement
Option c – Decomposition
Quicklime reacting with water gives
A) C + O₂ → CO₂
B) CH₄ + 2O₂ → CO₂ + 2H₂O
C) CaO + H₂O → Ca(OH)₂
D) CaO + H₂O → Ca + H₂
Option c – CaO + H₂O → Ca(OH)₂
If the temperature increases by 100 °C, the rate constant of a chemical reaction becomes roughly
A) Triple
B) Double
C) Half
D) One-fourth
Option b – Double
A reaction where the rate is directly proportional to the first power of reactant concentration is
A) First-order reaction
B) Second-order reaction
C) Zero-order reaction
D) Third-order reaction
Option a – First-order reaction
Which decomposition reaction is not a redox process
A) Decomposition of water
B) Decomposition of calcium carbonate
C) Decomposition of potassium chlorate
D) Decomposition of sodium hydride
Option b – Decomposition of calcium carbonate
For the balanced equation C₂H₅OH + O₂ → CO₂ + H₂O, the number of CO₂ and H₂O molecules formed respectively is
A) 2 and 3
B) 3 and 2
C) 3 and 6
D) 1 and 1
Option a – 2 and 3
Heating lead nitrate produces brown fumes of
A) Dinitrogen trioxide
B) Nitrous oxide
C) Nitrogen dioxide
D) Nitric oxide
Option c – Nitrogen dioxide
White silver chloride turns grey in sunlight because
A) Rusting of silver occurs in oxygen
B) A redox reaction takes place
C) Silver chloride decomposes into silver and chlorine in Light
D) Silver chloride is displaced to silver oxide
Option c – Silver chloride decomposes into silver and chlorine in Light
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