The correct order of electronegativity is
1.Cl > F > O > Br
2. F > O > Cl > Br
3. F > Cl > Br > O
4. O > F > Cl > Br
Posted Date:-2021-03-08 07:20:37
Find the successive elements of the periodic table with ionisation energies, 2372, 520 and 890 kJ per mol respectively
1. Li, Be, B
2.H, He, Li
3.B, C, N
4.He, Li, Be
Posted Date:-2021-03-08 07:20:37
For the same value of n, the penetration power of orbital follows the order
1.s = p = d = f
2. p > s > d > f
3. f < d < p < s
4.s < p < d < f
Posted Date:-2021-03-08 07:20:37
In the modern periodic table, the number of period of the element is the same as
1. principal quantum number
2.atomic number
3.azimuthal quantum number
4.atomic mass
Posted Date:-2021-03-08 07:20:37
The correct order for the size of I, I+, I– is
1. I > I– > I+
2. I > I+ > I–
3. I– > I > I+
4. I+ > I– > I
Posted Date:-2021-03-08 07:20:37
Two different beakers contain M1-O-H, and M2-O-H solutions separately. Find the nature of the two solutions if the electronegativity of M1 = 3.4, M2 = 1.2, O = 3.5, H = 2.1
1. acidic, acidic
2.basic, acidic
3. basic, basic
4.acidic, basic
Posted Date:-2021-03-08 07:20:37
Which of the following statements is incorrect?
1.I.E.1 of O is lower than that of N but I.E.2 O is higher than that of N
2.The enthalpy of N to gain an electron is almost zero but of P is 74.3 kJ mol-1
3.isoelectronic ions belong to the same period
4.The covalent radius of iodine is less than its Van der Waal’s radius
Posted Date:-2021-03-08 07:20:37
Which of the reactions will need the maximum amount of energy?
1.Na → Na+ + e–
2. Ca+ → Ca++ + e–
3.K+ → K+ ++ e–
4.C2+ → C3+ + e–
Posted Date:-2021-03-08 07:20:37
Which one is the most acidic among these?
1. MgO
2.CaO
3.Al2O3
4.Na2O
Posted Date:-2021-03-08 07:20:37
Which one will have the highest 2nd ionisation energy?
1.1s2 2s2 2p6 3s1
2. 1s2 2s2 2p4
3.1s2 2s2 2p6
4.1s2 2s2 2p6 3s2
Posted Date:-2021-03-08 07:20:37