Topic Question Set
Q 1
:
Given below are two statements :
Statement I : The boiling point of hydrides of group 16 elements follow the order
Statement II : On the basis of molecular mass is expected to have lower boiling point than the other members of the group but due to the presence of extensive H-bonding in , it has higher boiling point.
In the light of the above statements, choose correct answer from the options given below : [2024]
Both Statement I and Statement II are true.
Both Statement I and Statement II are false.
Statement I is true but Statement II is false.
Statement I is false but Statement II is true.
(1)
has higher boiling point due to extensive hydrogen bonding.
B.pt.: 373 K 269 K 232 K 213 K
Hence, both statements I and II are correct.
Q 2
:
Among group 16 elements, which one does not show –2 oxidation state? [2024]
O
Se
Te
Po
(4)
Going down the group, electronegative character increases, thus tendency to show –2 oxidation state decreases from sulphur to polonium. Hence, Po does not show –2 oxidation state.
Q 3
:
Given below are two statements:
Statement-I : The boiling points of the following hydrides of group 16 elements increases in the order:
Statement-II : The boiling points of these hydrides increase with increase in molecular mass.
In the light of the above statements, choose the most appropriate answer from the options given below: [2022]
Both statement-I and statement-II are correct.
Both statement-I and statement-II are incorrect.
Statement-I is correct but statement-II is incorrect.
Statement-I is incorrect but statement-II is correct.
(2)
Q 4
:
Which is the correct thermal stability order for (E = O, S, Se, Te and Po)? [2019]
(4)
The thermal stability of hydrides decreases from to . This is because as the size of atom E in increases, the bond H–E becomes weaker and thus, breaks on heating. Therefore, the correct order of thermal stability is
Q 5
:
Acidity of diprotic acids in aqueous solutions increases in the order [2014]
(1)
As the atomic size increases down the group, the bond length increases and the bond strength decreases and the cleavage of E–H bond becomes easier thus, more will be the acidity. Thus, the correct order is: .
