Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Chemistry

Indicate the steps in the preparation of KMnO₄ from pyrolusite ore.

The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacyanoion contains only one unpaired electron. Explain using Crystal Field Theory.

Draw figure to show the splitting of d orbitals in an octahedral crystal field.

How does the magnitude of Δ_o decide the actual configuration of d orbitals in a coordination entity?

What are the monomeric repeating units of Nylon-6 and Nylon-6, 6?

What is a biodegradable polymer? Give an example of a biodegradable aliphatic polyester.

The melting points and solubility in water of amino acids are generally higher than those of the corresponding halo acids. Explain.

What are non-essential amino acids? Give two examples.

Account for the following:

Although the amino group is o, p-directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m-nitroaniline.

Write short notes on acetylation.

Give the IUPAC name of the following compound:

PhCH₂CH₂COOH

Give the IUPAC name of the following compound:

(CH₃)₂C=CHCOOH

Give the IUPAC name of the following compound:

Give the IUPAC name of the following compound:

How the following conversion can be carried out?

Benzene to 4-bromonitrobenzene

Complete the following reactions: C₂H₄ + O₂ →

Complete the following reactions:  4Al + 3O₂ →

Why is dioxygen a gas but sulphur a solid?

Why do noble gases have comparatively large atomic sizes?

Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number.