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

Name the type of cell which was used in Apollo space programme for providing electrical power.

Define the following term as related to proteins:

Primary structure

Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state.

Which stoichiometric defect does not change the density of the crystal?

Define terms: Fuel cell

Which stoichiometric defect decreases the density of the crystal?

Define the following terms: Secondary batteries

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”.

What are the different oxidation states exhibited by the lanthanoids?

Compare the chemistry of actinoids with that of lanthanoids with special reference to electronic configuration.

Compare the chemistry of actinoids with that of the lanthanoids with special reference to oxidation state.

Compare the chemistry of actinoids with that of the lanthanoids with special reference to atomic and ionic sizes.

Compare the chemistry of actinoids with that of the lanthanoids with special reference to chemical reactivity.

The chemistry of the actinoid elements is not so smooth as that of the Lanthanoids. Justify this statement by giving some examples from the oxidation state of these elements.

Name the members of the lanthanoid series which exhibit +4 oxidation state and those which exhibit +2 oxidation state. Try to correlate this type of behavior with the electronic configurations of these elements.

Write the electronic configurations of the element with the atomic number 61.