Acids, Bases and Salts — Science STD 10 — Question

What is black gold and how is it formed?

Write the structural formula of ethanol. What happens when it is heated with excess of conc. H₂SO₄ at 443 K? Write the chemical equation for the reaction stating the role of conc. H₂SO₄ in this reaction.

Write the equations for the reactions of:

1. Iron with steam.
2. Calcium with water.
3. Potassium with water.

When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire. Identify X, Y and Z and also write the reaction involved.

Define the term ‘structural isomerism’. Explain why propane cannot exhibit this property. Draw the structures of possible isomers of butane, C₄H₁₀.

Explain giving equation, what happens when:

1. ZnCO₃ is heated in the absence of air?
2. A mixture of CU₂O and CU₂S is heated?

A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of the chemical reaction?

State some of the uses of mineral acids in industry.

Explain the nature of the covalent bond using the bond formation in CH₃Cl.