Classification of Elements and Periodicity in Properties

In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively.

1. lowest and lowest
2. highest and lowest
3. lowest and highest
4. highest and highest

The 1st ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the 2nd ionization enthalpy of Mg is .

1. −906 kJ/mol
2. −856 kJ/mol
3. +1450 kJ/mol
4. +590 kJ/mol

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

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

The correct order of C, N, O and F in terms of second ionisation potential is

1. C < N < F < O
2. C < F < N < O
3. F < N < C < O
4. C < O < N < F

The correct trend in the first ionization enthalpies of the elements in the 3rd period of periodic table is :

1. Si < S < Al < P < Cl
2. Al < Si < S < P < Cl
3. S < Si < Al < P < Cl
4. Al < S < P < Si < Cl

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

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

A 'p'-block element (E) and hydrogen form a binary cation (EHx)+, while EH3 on treatment with K2HgI4 in alkaline medium gives a precipitate of basic mercury(II) amido-iodine. Given below are first ionisation enthalpy values ( kJ mol-1) for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E.

1. 1402
2. 1086
3. 801
4. 1312

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

Which of the following represents the correct trend for the mentioned property? Choose the correct answer from the options given below :

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

The atomic number of the element from the following with lowest 1st ionisation enthalpy is :

1. 32
2. 35
3. 19
4. 87