Classification of Elements and Periodicity in Properties questions
826 published questions with worked solutions.
- There are 4 diatomic compounds (AB) with electronegativity differences between them (X_A-X_B) of 1.9, 0.9, 0.7 and 0.4. The...
- How many of the following are non-metals? Boron, Aluminium, Phosphorus, Lead, Selenium, Thallium, Mercury
- The first and second ionization energies for K are 4.34 eV and 31.63 eV. What is the value (with the sign) of its electron gain...
- Consider the following steps: M(g) M^+(g) + e^-: H_1 = 50 eV M(g) M^ 2+ (g) + 2e^-: H_2 = 150 eV M(g) M^ 3+ (g) + 3e^-: H_3 = 750...
- The number of elements in the fifth period of the modern periodic table is ______.
- The atomic symbols of some elements are given below: Si, C, Al, S, F, B, Li, Mg, O The number of elements from the above having...
- Some periodic properties are given below. The number of properties that show a decrease in the general periodic trend down a...
- Some periodic properties are given below. The number of properties that show an increase in the general periodic trend down a...
- Among the following, the number of species that are isoelectronic with Ne is ______. N^ 3- , O^ 2- , Cl, F, F^-, O, Na^+, Mg^+,...
- How many sets among the following combinations contain only isoelectronic species? 1. P^ 3- ,S^ 2- ,Cl^-,Ar 2. N^ 3- ,O^ 2- ,C^...
- The electron affinity of iodine is 4.9 10^ -19 J/atom. The electron gain enthalpy of iodine in eV per atom is ______.
- How many of the following sets represent Döbereiner's triads? 1. P, As, Bi 2. Ca, Sr, Ba 3. Cl, Br, I 4. Li, Na, K
- The number of elements in the 2nd period of the modern periodic table is ______.
- The number of elements from the following which have valence electron(s) in the M-shell is ______. Si, C, N, Be, Al, S, F, B, Li,...
- Atomic numbers of some elements are given below. The number of elements from the following that will be placed in group 2 of the...
- For a diatomic molecule AB, the electronegativity difference between A and B=0.2028 [where = bond energy of AB minus the...
- One mole of magnesium in the vapour state absorbed 1200 KJ of energy. I.E._1=750 KJ/mol and I.E._2=1450 KJ/mol. In the final...
- The electronic configuration of deuterium is:
- The ionization energy of hydrogen is:
- Which of the following properties of lithium does not show diagonal relationship with magnesium? [Indraprastha CET 2009, CG PET...
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