The d-and f-Block Elements — Chemistry STD 12 Science — Question

In a reaction, 2A → Products, the concentration of A decreases from 0.5 mol L^–1 to 0.4 mol L^–1 in 10 minutes. Calculate the rate during this interval?

Write the structures of the following organic halogen compound.
1,4-Dibromobut-2-ene.

Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

1. Assertion and reason both are correct statements and reason is correct explanation for assertion.
2. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
3. Assertion is correct statement but reason is wrong statement.
4. Assertion and reason both are incorrect statements.
5. Assertion is wrong statement but reason is correct statement.

Assertion: Molarity of a solution in liquid state changes with temperature.
Reason: The volume of a solution changes with change in temperature.

On the basis of Lanthanoid contraction, explain the following:
Stability of the complexes of lanthanoids.

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

What is the order of dehydration of primary, secondary and tertiary alcohols?

Draw the structure of the following compound.
p, p’-Dihydroxybenzophenone.

Why is it not possible to measure the single electrode potential?