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Chem Bond Chemicals. We covered all the Chem Bond Chemicals in this post for free so that you can practice well for the exam.
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MCQ on Chem Bond Chemicals for Students
The reaction Fe₂O₃ + 2Al → Al₂O₃ + 2Fe is an example of:
(a) a combination reaction
(b) a double displacement reaction
(c) a decomposition reaction
(d) a simple displacement reaction
Option d – a simple displacement reaction
What is observed when dilute hydrochloric acid is added to iron filings?
(a) Hydrogen gas and iron chloride are formed
(b) Chlorine gas and iron chloride are formed
(c) No visible reaction takes place
(d) Iron salts and water are formed
Option a – Hydrogen gas and iron chloride are formed
What happens if a copper rod is placed in a solution of iron sulphate?
(a) Copper replaces iron in the solution
(b) The solution turns blue due to copper sulphate formation
(c) No chemical change occurs
(d) The reaction releases heat
Option c – No chemical change occurs
The reaction AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq) is:
(a) a precipitation reaction
(b) a double displacement reaction
(c) a combination reaction
(d) both (a) and (b)
Option d – both (a) and (b)
The reaction where two compounds switch ions and form new compounds is called:
(a) a displacement reaction
(b) a decomposition reaction
(c) an isomerization reaction
(d) a double displacement reaction
Option d – a double displacement reaction
In the reaction SO₂ + 2H₂S → 2H₂O + 3S, hydrogen sulphide functions as:
(a) an oxidising agent
(b) a reducing agent
(c) a dehydrating agent
(d) a catalyst
Option b – a reducing agent
A substance that gets oxidised itself while reducing others is termed as:
(a) oxidising agent
(b) reducing agent
(c) both of the above
(d) none of the above
Option b – reducing agent
In the chemical equation PbO + C → Pb + CO:
(a) PbO acts as a reducing agent
(b) Carbon behaves as an oxidising agent
(c) Carbon works as a reducing agent
(d) It is not a redox reaction
Option c – Carbon works as a reducing agent
The reaction CuO + H₂ → H₂O + Cu is an example of:
(a) redox reaction
(b) synthesis reaction
(c) neutralisation reaction
(d) analytical reaction
Option a – redox reaction
What is the mole ratio of hydrogen to oxygen gases produced during the electrolysis of water?
(a) 1:1
(b) 2:1
(c) 4:1
(d) 1:2
Option b – 2:1
What takes place when SO₂ gas is passed through a saturated H₂S solution?
(a) SO₂ + 2H₂S → 2H₂O + 3S
(b) SO₂ + 2H₂S → H₂O + 3S
(c) SO₂ + H₂S → H₂O + S
(d) SO₂ + H₂O → SO₃ + H₂
Option a – SO₂ + 2H₂S → 2H₂O + 3S
What are the products when iron filings react with dilute hydrochloric acid?
(a) Fe(III) chloride and water
(b) Fe(II) chloride and water
(c) Fe(II) chloride and hydrogen gas
(d) Fe(III) chloride and hydrogen gas
Option d – Fe(III) chloride and hydrogen gas
The reaction Pb + CuCl₂ → PbCl₂ + Cu is categorized as:
(a) combination reaction
(b) double displacement reaction
(c) decomposition reaction
(d) displacement reaction
Option d – displacement reaction
Which gases are ideal for storing food items?
(a) Carbon dioxide or oxygen
(b) Nitrogen or oxygen
(c) Carbon dioxide or helium
(d) Helium or nitrogen
Option d – Helium or nitrogen
When ferrous sulphate is gradually added to acidified potassium permanganate, the purple colour fades because:
(a) KMnO₄ acts as an oxidiser and reacts with FeSO₄
(b) FeSO₄ oxidises KMnO₄
(c) The solution becomes colourless due to dilution
(d) KMnO₄ decomposes into a colourless compound in FeSO₄’s presence
Option a – KMnO₄ acts as an oxidiser and reacts with FeSO₄
Which equation shows the correct physical states of reactants and products at reaction conditions?
(a) 2H₂(l) + O₂(l) → 2H₂O(g)
(b) 2H₂(g) + O₂(l) → 2H₂O(l)
(c) 2H₂(g) + O₂(g) → 2H₂O(l)
(d) 2H₂(g) + O₂(g) → 2H₂O(g)
Option d – 2H₂(g) + O₂(g) → 2H₂O(g)
A balanced chemical equation supports which scientific principle?
(a) Law of multiple proportions
(b) Law of conservation of mass
(c) Both (a) and (b)
(d) Neither (a) nor (b)
Option b – Law of conservation of mass
What defines a chemical change?
(a) An energy change occurs
(b) New substances are formed
(c) The process is irreversible
(d) All of the above
Option d – All of the above
Which of the following statements is accurate?
(a) Mass remains unchanged in chemical changes
(b) Chemical changes are permanent and irreversible
(c) Physical changes are temporary and reversible
(d) All statements are correct
Option d – All statements are correct
Which of the statements is inaccurate regarding a chemical equation?
(a) It tells us about the substances involved
(b) It provides symbols and formulas of all substances
(c) It gives details of atoms or molecules in reactants and products
(d) All of the above are accurate
Option d – All of the above are accurate
Which among the following is not a balanced equation?
(a) Fe + Cl₂ → FeCl₃
(b) Mg + CuSO₄ → MgSO₄ + Cu
(c) Zn + S → ZnS
(d) 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
Option a – Fe + Cl₂ → FeCl₃
What is the name of a substance added to fatty foods to prevent oxidation?
(a) Oxidant
(b) Rancid
(c) Coolant
(d) Antioxidant
Option d – Antioxidant
The condition caused by exposure of fats and oils to air, resulting in bad odour and taste, is known as:
(a) antioxidation
(b) reduction
(c) rancidity
(d) corrosion
Option c – rancidity
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