p-Block Elements (Group 13 & 14) · Question 3

Consider the following reactions Na2B4O7 2X + Y CuSO4 + Y Non-luminous flame Z + SO3 2Z + 2X + Carbon Luminous flame 2Q + Na2B4O7 + CO The oxidation states of Cu in Z and Q, respectively are :

1. +2 and +1
2. +1 and +1
3. +1 and +2
4. +2 and +2

Choose the INCORRECT statement

1. Carbon exhibits negative oxidation states along with +4 and +2.
2. Carbon cannot exceed its covalency more than four.
3. Among the isotopes of carbon, 13C is a radioactive isotope.
4. CO2 is the most acidic oxide among the dioxides of group 14 elements.

The correct statements from the following are : Choose the correct answer from the options given below :

1. B and D Only
2. C and D Only
3. A and D Only
4. A and C Only

It is noticed that Pb2+ is more stable than Pb4+ but Sn2+ is less stable than Sn4+. Observe the following reactions. PbO2 + Pb 2PbO; rG (1) SnO2 + Sn 2SnO; rG (2) Identify the correct set from the following

1. rG (1) > 0; rG (2) < 0
2. rG (1) < 0; rG (2) > 0
3. rG (1) < 0; rG (2) < 0
4. rG (1) > 0; rG (2) > 0

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Both Statement I and Statement II are false
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are true
4. Statement I is true but Statement II is false

The group 14 elements A and B have the first ionisation enthalpy values of 708 and 715 kJ mol-1 respectively. The above values are lowest among their group members. The nature of their ions A2+ and B4+ respectively is

1. both reducing
2. oxidising and reducing
3. both oxidising
4. reducing and oxidising

The correct statements from the following are : Choose the correct answer from the options given below :

1. A, B, D and E only
2. A, C and D only
3. A, B, C and E
4. B, D and E only

Given below are the pairs of group 13 elements showing their relation in terms of atomic radius. (B < Al), (Al < Ga), (Ga < In) and (In < Tl). Identify the elements present in the incorrect pair and in that pair find out the element (X) that has higher ionic radius (M3+) than the other one. The atomic number of the element (X) is

1. 49
2. 81
3. 31
4. 13

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

1. Statement I is correct but Statement II is incorrect
2. Both Statement I and Statement II are incorrect
3. Statement I is incorrect but Statement II is correct
4. Both Statement I and Statement II are correct

The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively :

1. B & Tl
2. Tl & B
3. B & In
4. B & Ga