To Access the full content, Please Purchase
What is the effect of catalyst on:
(i) Gibbs energy (ΔG) and
(ii) activation energy of a reaction?Marks:1
(i) There will be no effect of catalyst on Gibbs energy (ΔG) of a reaction.
(ii) A catalyst reduces the activation energy by providing alternate path for reaction to proceed.
Write one similarity between Physisorption and Chemisorption.Marks:1
Both physisorption and chemisorption depend on the surface area of the adsorbent and both increase with increase of surface area of the adsorbent.
Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number.Marks:1
The group number of Manganese (Mn) is 7. Therefore, the formula of an oxo-anion of manganese (Mn) in which it shows the oxidation state 7 is MnO4–. Oxidation state of Mn in MnO4– can be calculated as follows:
Mn + (-2 x 4) = –1
Mn – 8 = –1
Mn = –1 + 8
Mn = +7
It shows that the oxidation of Mn in MnO4– is +7 which is equal to its group number which is 7.
Write the structure of 3-Bromo-2-methylprop-1-ene.Marks:1
Write IUPAC name of the following compound:Marks:1
The IUPAC name of the compound is:
Write the reactions involved in the following reactions:
(i) Clemmensen reduction
(ii) Cannizzaro reactionMarks:2
(i) Clemmensen reduction: When aldehydes or ketones are treated with zinc-amalgam and concentrated HCl, they are reduced to the corresponding hydrocarbons.
(ii) Cannizzaro reaction: Aldehydes that do not have an a-hydrogen atom undergo self oxidation and reduction on treatment with a concentrated alkali.
Draw the structures of the following:
Define the following terms:
(i) Abnormal molar mass
(ii) van’t Hoff factorMarks:2
(i) Abnormal molar mass: Due to association or dissociation of molecules, the molar mass of a substance calculated from its colligative property is either lower or higher than the expected or normal value. Such molar mass is known as abnormal molar mass.
(ii) van’t Hoff factor : The extent of dissociation or association of molecules was determined by van’t Hoff. He introduced a factor called van’t Hoff factor (i).
van’t Hoff factor is the ratio of the observed (experimental) value of a colligative property to the normal (calculated) value of the same property.