Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

What type of defect can arise when a solid is heated? Which physical property is affected by it and in what way?

What type of stoichiometric defect is shown by:

(i) ZnS 

(ii) AgBr

Vapour pressure of water at 293 K is 17.535 mm Hg. Calculate the vapour pressure of water at 293 K when 25 g of glucose is dissolved in 450 g of water.

In the button cells widely used in watches and other devices, the following reaction takes place:

\[\ce{Zn_{(s)} + Ag2O_{(s)} + H2O_{(l)} -> Zn{^{2+}_{(aq)}} + 2Ag_{(s)} + 2OH^-_{ (aq)}}\]

Determine Δ_rG° and E° for the reaction.

Comment on the statement that “colloid is not a substance but a state of substance”.

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 Δ₀ decide the actual configuration of d orbitals in a coordination entity?

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.

An organic compound with the molecular formula C₉H₁₀O forms 2, 4-DNP derivative, reduces Tollens’ reagent and undergoes Cannizzaro reaction. On vigorous oxidation, it gives 1, 2-benzenedicarboxylic acid. Identify the compound.

Describe the following:

Cannizzaro reaction

How will you bring about the following conversion?

Benzene to biphenyl

How the following conversion can be carried out?

Benzene to diphenyl

Write the reactions involved in the following reactions: Clemmensen reduction

Write the product(s) in the following reactions

Write the product(s) in the following reactions

Give simple chemical tests to distinguish between the following pairs of compounds :

Propanol and 2-methylpropan-2-ol

Write the equation involved in the following reaction:

Etard reaction

Write the formula of the compound of iodine which is obtained when conc. HNO₃ oxidises I₂