First three ionisation energies (in kJ/mol) of three representative elements are given below:
Element
P 495.8 4562 6910
Q 737.7 1451 7733
R 577.5 1817 2745
Then incorrect option is :
1. Q: Alkaline earth metal.
2. P: Alkali metal.
3. R: s-block element.
4. All three: P,Q & R belong to the same period.
If the ionization enthalpy and negative electron gain enthalpy of an element are 275 and 86 kcal respectively, then the electronegativity of the element on the Pauling scale is:
1. 2.8
2. 0.0
3. 4.0
4. 2.6
The incorrect statement is:
(1) The second ionisation energy of Se is greater than that of second ionisation energy of As
(2) The first ionisation energy of ion is greater than that of first ionisation energy of ion
(3) The third ionisation energy of F is greater than that of third ionisation energy of O
(4) Helogens have highest I.E. in respective period
Consider the following ionisation reactions :
I.E. (kJ )
If monovalent positive ion of A, divalent positive ion of B and trivalent positive ion of C have zero electron. Then incorrect order of corresponding I.E. is :
(1)
(2)
(3)
(4)
The incorrect match among the following options is :
1.
2.
3.
4.
Which of the following order is correct for the property mentioned in brackets?
(Ionisation energy)
(2nd Ionisation energy)
(Electronegativity)
(Ionic radius)
and for Mg are 178 Kcal mol–1 and 348 Kcal , respectively. The energy required for the reaction, will be:
1. +170 Kcal
2. +526 Kcal
3. –170 Kcal
4. –526 Kcal
Incorrect statement about characteristics regarding halogens is :
1. Ionization energy decreases with increase in atomic number.
2. Electronegativity decreases with increase in atomic number.
3. Electron affinity decreases with increase in atomic number.
4. Enthalpy of fusion increases with increase in atomic number.
The process requiring the absorption of energy is :
1.
2.
3.
4.
Consider the following statements:
(I) Rutherford name was associated with the development of periodic table.
(II) A metal M having electronic configuration is d-block element.
(III) Diamond is an element.
(IV) The electronic configuration of the most electronegative elements is
and select the correct one from the given codes.
(A) I, II, IV (B) I, II, III, IV
(C) II, IV (D) I, III, IV