Electrolysis Experiment with Water and Dilute Sulphuric Acid

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What are the products formed from the thermal decomposition of lead nitrate?

Lead oxide and nitrogen dioxide (correct)
Lead oxide and oxygen
Lead nitrate and oxygen
Calcium oxide and carbon dioxide

Which of the following statements is true about ferric oxide (Fe2O3) and the sulphur gases SO2 and SO3?

Ferric oxide is a gas, while SO2 and SO3 are solids.
Ferric oxide, SO2, and SO3 are all gases.
Ferric oxide, SO2, and SO3 are all solids.
Ferric oxide is a solid, while SO2 and SO3 are gases. (correct)

What are the products of decomposing calcium carbonate by heating (thermal decomposition)?

Calcium oxide (quick lime) and carbon dioxide (correct)
Calcium oxide (lime) and carbon monoxide
Calcium hydroxide and carbon dioxide
Calcium carbonate and oxygen gas

What do you observe when lead nitrate is heated, as described in Activity 1.6?

Emission of brown fumes of nitrogen dioxide (C) Signup and view all the answers

Which type of reaction occurs when a substance breaks down into simpler substances upon heating?

Decomposition reaction (D) Signup and view all the answers

What is another name for calcium oxide?

Quick lime (A) Signup and view all the answers

What is the purpose of adding a few drops of dilute sulphuric acid to water in the activity?

To increase the conductivity of water (B) Signup and view all the answers

What do the bubbles observed at both electrodes during the electrolysis of water signify?

Formation of oxygen gas (C) Signup and view all the answers

Why are test tubes filled with water and inverted over the carbon electrodes during the experiment?

To collect the gas produced during electrolysis (C) Signup and view all the answers

What is the color change that silver chloride undergoes when exposed to sunlight?

White to grey (C) Signup and view all the answers

What is the result of exposing silver chloride to sunlight according to the text?

Decomposition into silver and chlorine (D) Signup and view all the answers

Which gas is formed as a product when silver chloride decomposes in sunlight?

$Cl_2$ (chlorine gas) (A) Signup and view all the answers

What is the chemical formula of calcium carbonate?

CaCO3 (B) Signup and view all the answers

Which type of reaction is the formation of water from hydrogen and oxygen?

Combination reaction (A) Signup and view all the answers

What is the product of the reaction between methane (CH4) and oxygen (O2)?

CO2 + H2O (B) Signup and view all the answers

Which process releases heat along with the formation of products?

Exothermic process (C) Signup and view all the answers

What do rice, potatoes, and bread contain that provides energy to humans during digestion?

Carbohydrates (C) Signup and view all the answers

Which of the following reactions involves the burning of coal?

C(s) + O2(g) → CO2(g) (B) Signup and view all the answers

What is the reason for the iron nail becoming brownish in color?

It displaces copper from copper sulfate solution (C) Signup and view all the answers

What is the process called when a more reactive element displaces a less reactive element from its compound?

Displacement reaction (A) Signup and view all the answers

What is formed when sodium sulfate solution and barium chloride solution are mixed?

A white insoluble substance (C) Signup and view all the answers

Which element is more reactive than copper based on the displacement reactions given?

Zinc (C) Signup and view all the answers

In the reaction Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s), what is the role of iron?

It displaces copper from the solution (A) Signup and view all the answers

What happens when zinc reacts with copper sulfate according to the given displacement reaction?

Copper is displaced by zinc (D) Signup and view all the answers