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Chemical Bonds for Dummies. We covered all the Chemical Bonds for Dummies mcq in this post for free so that you can practice well for the exam.
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mcq on Chemicals Bonds for Dummies for Students
Which gases can be used to preserve oil samples for extended periods?
(a) Carbon dioxide or oxygen
(b) Nitrogen or oxygen
(c) Carbon dioxide or helium
(d) Helium or nitrogen
Option d – Helium or nitrogen
When calcium oxide is combined with water, calcium hydroxide forms along with Heat. This process is known as lime slaking. The solution formed is called lime water. Which of the following statements are accurate? A. It is an endothermic reaction B. It is an exothermic reaction C. The pH of the solution formed is above seven D. The pH of the solution formed is below seven
(a) A and B
(b) B and C
(c) A and D
(d) C and D
Option b – B and C
What type of reaction is shown by the equation: Mg(s) + 2HCl (aq) → MgCl₂(aq) + H₂(g)?
(a) Combination reaction
(b) Neutralisation reaction
(c) Displacement reaction
(d) Decomposition reaction
Option c – Displacement reaction
Based on the characteristics below, identify the correct type of reaction:A. A compound splits into simpler substances B. Electrolysis of water represents this kind of reaction
(a) Electrolytic decomposition
(b) Thermal decomposition
(c) Photochemical decomposition
(d) Catalytic decomposition
Option a – Electrolytic decomposition
Which reaction type is indicated by the following features? A. Takes place during rusting B. Happens during the process of Respiration
(a) Combustion reaction
(b) Redox reaction
(c) Oxidation reaction
(d) Exothermic reaction
Option b – Redox reaction
When calcium carbonate is heated, it releases a colourless gas. This is an example of:
(a) Decomposition reaction
(b) Displacement reaction
(c) Double decomposition reaction
(d) Double displacement reaction
Option a – Decomposition reaction
Which of the following statements is accurate?
(a) Ammonia and hydrogen chloride produce ammonium hydroxide
(b) Loss of hydrogen from a compound is a type of reduction
(c) FeS reacting with H₂SO₄ is a double displacement reaction
(d) A matchstick ignites when placed in a blue candle flame
Option c – FeS reacting with H₂SO₄ is a double displacement reaction
Hydrogen combines with oxygen to produce water. The equation is: O₂(g) + H₂(g) → H₂O(g) Which statements are applicable? A. Hydrogen undergoes oxidation B. Oxygen undergoes reduction C. Hydrogen undergoes reduction D. It is a redox reaction
(a) A, B and C
(b) B, C and D
(c) A, C and D
(d) A, B and D
Option d – A, B and D
Consider the following and choose the correct option: Assertion: A chemical reaction becomes faster at elevated temperatures Reason: Molecules move more rapidly at higher temperatures
(a) Both assertion and reason are true, and reason explains the assertion
(b) Both are true, but reason does not explain the assertion
(c) Assertion is true, reason is false
(d) Assertion is false, reason is true
Option a – Both assertion and reason are true, and reason explains the assertion
Which reaction below is not balanced correctly?
(a) Mg + H₂O → Mg(OH)₂ + H₂
(b) 2AlCl₃ + 3Ca(OH)₂ → 2Al(OH)₃ + 3CaCl₂
(c) 2KClO₃ → 2KCl + 3O₂
(d) 2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
Option a – Mg + H₂O → Mg(OH)₂ + H₂
Identify the balanced reaction that also involves combustion:
(a) C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
(b) 6CO₂ + 12H₂O₂ → C₆H₁₂O₆ + 6O₂ + 6H₂O
(c) C₃H₆ + 4O₂ → 3CO₂ + 3H₂O
(d) 2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
Option a – C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Which reaction best represents the process of rust formation?
(a) 4Fe + 3O₂ + xH₂O → 2Fe₂O₃·xH₂O
(b) Fe + H₂SO₄ → FeSO₄ + H₂
(c) 2Fe₃O₄ + H₂O → 3Fe₂O₃ + H₂
(d) 2FeSO₄ → Fe₂O₃ + SO₂ + SO₃
Option a – 4Fe + 3O₂ + xH₂O → 2Fe₂O₃·xH₂O
Which of these contains only reducing agents?
(a) LiAlH₄, KMnO₄
(b) LiAlH₄, NaBH₄
(c) K₂Cr₂O₇, NaBH₄
(d) LiAlH₄, K₂Cr₂O₇
Option b – LiAlH₄, NaBH₄
Converting grapes into wine through fermentation is an example of:
(a) Displacement reaction
(b) Decomposition reaction
(c) Double displacement reaction
(d) Combination reaction
Option b – Decomposition reaction
Choose the correct order of reactivity with Acids for the Metals Zn, H₂, Pt, Sn, and Cd:
(a) Pt < H₂ < Sn < Cd < Zn
(b) Pt < H₂ < Cd < Sn < Zn
(c) Pt < H₂ < Cd < Zn < Sn
(d) H₂ < Pt < Cd < Sn < Zn
Option a – Pt < H₂ < Sn < Cd < Zn
A substance that provides ……… is called an oxidizing agent, while one that removes ………. is termed a reducing agent.
(a) Oxygen, hydrogen
(b) Oxygen, oxygen
(c) Hydrogen, oxygen
(d) Oxygen, hydrogen peroxide
Option b – Oxygen, oxygen
Two test tubes labeled A and B contain potassium iodide and lead nitrate solutions, respectively. When combined, they produce substances X and Y. What are X and Y?
(a) Yellow precipitate, yellow solution
(b) Yellow precipitate, colourless solution
(c) White precipitate, yellow solution
(d) White precipitate, colourless solution
Option b – Yellow precipitate, colourless solution
Hydrogen sulphide (H₂S) acts as a strong reducing agent. Which reaction below demonstrates this property?
(a) Cd(NO₃)₂ + H₂S → CDS + 2HNO₃
(b) CuSO₄ + H₂S → CuS + H₂SO₄
(c) 2FeCl₃ + H₂S → 2FeCl₂ + 2HCl + S
(d) Pb(NO₃)₂ + H₂S → PbS + 2CH₃COOH
Option c – 2FeCl₃ + H₂S → 2FeCl₂ + 2HCl + S
Washing soda reacts with hydrochloric Acid to release a colourless gas with effervescence. The gas is:
(a) Carbon dioxide
(b) Oxygen
(c) Carbon monoxide
(d) Chlorine
Option a – Carbon dioxide
When copper comes in contact with moist air and carbon dioxide, it forms a green layer composed of:
(a) Basic copper carbonate
(b) Copper sulphate
(c) Copper carbonate
(d) Copper nitrate
Option a – Basic copper carbonate
Silver chloride breaks down under certain conditions. What triggers this decomposition?
(a) Electricity
(b) Sunlight
(c) Heat
(d) Water
Option b – Sunlight
Which of the following reactions is a compound-compound type combination reaction?
(a) Water reacting with calcium oxide
(b) Iodine reacting with white phosphorus
(c) Iron reacting with sulphur
(d) Electrolysis of water
Option a – Water reacting with calcium oxide
Choose the correct statement regarding the reaction: 10HNO₃ + I₂ → 2HIO₃ + 10NO₂ + 4H₂O
(a) I₂ acts as an oxidizing agent
(b) I₂ undergoes reduction
(c) HNO₃ gets oxidized
(d) HNO₃ gets reduced
Option d – HNO₃ gets reduced
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