Class 10 Science Chemical Reactions Quiz
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Questions and Answers

What is the effective water of crystallization for one CaSO4 unit according to the formula provided?

  • 0.5 molecules of water (correct)
  • 2 molecules of water
  • 1.5 molecules of water
  • 1 molecule of water

Why do ionic compounds not conduct electricity in the solid state?

  • Ions are strongly bound together (correct)
  • Ions are free to move
  • Ions do not exist in solid ionic compounds
  • Ions are too large to conduct electricity

What is X in the reaction 2Al + Fe2O3 → Al2O3 + 2Fe?

  • Iron
  • Zinc
  • Aluminum (correct)
  • Oxygen

What process involves heating the ore strongly in the absence or limited supply of air?

<p>Calcination (A)</p> Signup and view all the answers

Why can't zinc oxide be reduced by heating alone?

<p>Zinc oxide is moderately reactive (A)</p> Signup and view all the answers

What metals make up the alloy solder?

<p>Lead and Tin (D)</p> Signup and view all the answers

Why do covalent compounds have low melting and boiling points?

<p>Weak intramolecular forces between molecules (A)</p> Signup and view all the answers

What does the purple color of KMnO4 decolourize into?

<p>Ethanoic acid (D)</p> Signup and view all the answers

Flashcards

Effective Water of Crystallization

The number of water molecules associated with one formula unit of a compound in its crystalline form.

Why Ionic Compounds Don't Conduct Electricity in Solid Form?

Ionic compounds in solid state have a rigid structure where ions are held together by strong electrostatic forces. These forces restrict the movement of ions, preventing them from conducting electricity.

What is X in the Reaction 2Al + Fe2O3 → Al2O3 + 2Fe?

Aluminum (Al) is the chemical element represented by the symbol X in the given reaction. It acts as a reducing agent, taking oxygen from iron oxide.

Calcination

Calcination is a thermal treatment process used to remove volatile substances, such as water or carbon dioxide, from ores by heating in the absence or limited supply of air.

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Why Can't Zinc Oxide Be Reduced by Heating Alone?

Zinc oxide (ZnO) is a moderately reactive compound. It requires a stronger reducing agent than heat alone to break down its chemical bonds and extract zinc.

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Metals in Solder

Solder is a metal alloy primarily composed of lead (Pb) and tin (Sn). Its composition varies based on its intended use.

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Low Melting and Boiling Points in Covalent Compounds

Covalent compounds have weak intermolecular forces between molecules. These forces are overcome at relatively low temperatures, resulting in low melting and boiling points.

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Decolorization of KMnO4

The purple color of potassium permanganate (KMnO4) decolorizes into a colorless solution due to its reduction to manganese(II) ions by ethanoic acid (CH3COOH).

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