Chemistry: Magnesium Oxide and Lead Nitrates

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Questions and Answers

The shiny finish of a wall after white wash is because of:

Calcium carbonate (correct)

Calcium oxide

Calcium hydroxide

Calcium phosphate

The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:

1:1

2:1 (correct)

4:1

1:2

Which of the following statements about the reaction 3Fe(s) + 4H2O(g) -> Fe2O3(s) + 4H2(g) are correct?

(i), (ii) and (iv) (correct)

(i), (ii) and (iii)

(ii) and (iv)

(iii) and (iv)

In order to prevent the spoilage of potato chips, they are packed in plastic bags containing the gas:

N2 Signup and view all the answers

The process of respiration is:

An oxidation reaction which is exothermic Signup and view all the answers

Give an example of a double displacement reaction.

2KI + Pb(NO3)2 -> PbI2 + 2KNO3 Signup and view all the answers

Name the reducing agent in the reaction 3MnO2 + 4Al -> 3Mn + 2Al2O3.

Aluminum (Al) Signup and view all the answers

What is the brown colored gas evolved when lead nitrate crystals are heated?

Nitrogen dioxide (NO2) Signup and view all the answers

Explain why silver chloride is stored in dark colored bottles.

To prevent it from turning grey on exposure to sunlight. Signup and view all the answers

Why does a copper vessel lose its shine when exposed to air?

Copper oxidizes in the presence of air. Signup and view all the answers

Why does iron displace copper from copper sulfate solution?

Iron is more reactive than copper. Signup and view all the answers

Identify the following reactions as combination, decomposition, displacement, or double displacement:

ZnCO3(s) -> ZnO(s) + CO2(g) = Decomposition Pb(s) + CuCl2 -> PbCl2(aq) + Cu(s) = Displacement H2(g) + Cl2(g) -> 2HCl = Combination CaCO3(s) -> CaO(s) + CO2(g) = Decomposition NaCl(g) + AgNO3(aq) -> AgCl + NaNO3 = Double Displacement 3H2(g) + N2(g) -> 2NH3(g) = Combination Fe2O3 + Al -> Al2O3 + 2Fe = Displacement Signup and view all the answers

When an aqueous solution of sodium sulfate and barium chloride is mixed together, it becomes:

Forms a white precipitate Signup and view all the answers

The color of ferrous sulfate crystal is:

Light green Signup and view all the answers

A student took solid quick lime in a china dish and added a small amount of water to it. He would hear:

Hissing sound Signup and view all the answers

When an iron nail is placed in copper sulfate solution, the observations are as follows:

Both 'a' and 'b' Signup and view all the answers

Study Notes

Chemical Reactions

Decomposition Reaction
- Example: Heating lead nitrate (2Pb(NO3)2) produces lead oxide (2PbO), nitrogen dioxide (4NO2), and oxygen (O2).
Precipitation Reaction
- Formation of barium sulfate (BaSO4) from barium chloride and sodium sulfate results in a white precipitate.

Light and Chemical Changes

Silver chloride (AgCl) undergoes a photochemical change, turning grey upon exposure to sunlight.

Double Displacement Reactions

Reaction of potassium iodide (2KI) with lead nitrate (Pb(NO3)2) yields lead iodide (PbI2), a yellow precipitate, and potassium nitrate (2KNO3).
Reaction of potassium bromide (2KBr) with barium iodide (BaI2) results in the formation of potassium iodide (2KI) and barium bromide (BaBr2).

Quiz Questions and Answers

Wall finish shiny due to calcium carbonate (c).
Electrolysis of water produces hydrogen and oxygen in a 2:1 mole ratio (b).
In the reaction involving iron and water, iron is oxidized, water is reduced, and acts as an oxidizing agent (c).
Potato chips are packed in nitrogen gas (c) to prevent spoilage.
Respiration is an exothermic oxidation reaction (d).

Examples of Chemical Reactions

Double Displacement Examples
- Aqueous sodium sulfate reacts with barium chloride, forming a white precipitate (b).
Color of Ferrous Sulfate
- Ferrous sulfate crystals are light green (b).
Reactions Involving Quick Lime
- Mixing quick lime with water produces a hissing sound (c).
Iron and Copper Sulfate Reaction
- Placing an iron nail in copper sulfate results in a light green solution and a brown deposit on the nail (c).

Classifications of Reactions

Reactions Identified
- ZnCO3(s) decomposes into ZnO(s) + CO2(g) - Decomposition
- Pb(s) + CuCl2 → PbCl2(aq) + Cu(s) - Displacement
- H2(g) + Cl2(g) → 2HCl - Combination
- CaCO3(s) decomposes to CaO(s) + CO2(g) - Decomposition
- NaCl(g) + AgNO3(aq) → AgCl + NaNO3 - Double Displacement
- 3H2(g) + N2(g) → 2NH3(g) - Combination
- Fe2O3 + Al → Al2O3 + 2Fe - Displacement

Additional Notes

Chemical reactions can be classified based on their characteristics and interactions, such as combination, decomposition, displacement, and double displacement.
Understanding the behavior of substances under different conditions is crucial in predicting the outcomes of chemical reactions.

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Description

Explore the chemical reactions involving magnesium oxide and lead nitrate in this quiz. Test your knowledge on the conversion of lead nitrate to lead oxide and other products. Ideal for chemistry students seeking to deepen their understanding.