Chemistry Practice

Chapter-wise Chemistry practice for Class 12th.

Practice original NCERT-style chemistry examples with short solutions across solution chemistry, electrochemistry, and organic basics.

Back to Class 12th Physics Chemistry Biology
Chapter-wise Practice

Chemistry example questions with answers

These are original chapter-wise practice questions inspired by Class 12th NCERT-style learning goals, not copied textbook examples.

Solutions

Question 1

Find the molarity of a solution made by dissolving 9.8 g of H2SO4 in water to make 500 mL of solution.

Answer:

Molar mass of H2SO4 = 98 g/mol. Moles = 9.8 / 98 = 0.1 mol. Volume = 0.5 L. Molarity = 0.1 / 0.5 = 0.2 M.

Question 2

What happens to boiling point when a non-volatile solute is added to a solvent?

Answer:

The boiling point increases because the vapour pressure of the solution decreases.

Electrochemistry

Question 1

What is oxidation in terms of electrons?

Answer:

Oxidation is the loss of electrons.

Question 2

Why is a salt bridge used in an electrochemical cell?

Answer:

It maintains electrical neutrality by allowing ions to move between the two half-cells.

Haloalkanes and Haloarenes

Question 1

What is the difference between a haloalkane and a haloarene?

Answer:

In a haloalkane, the halogen is attached to an alkyl carbon. In a haloarene, the halogen is directly attached to an aromatic ring.

Question 2

Why are haloarenes less reactive toward nucleophilic substitution than haloalkanes?

Answer:

The carbon-halogen bond in haloarenes has partial double-bond character due to resonance, making it harder to break.

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