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question_answer1) The boiling point of Kr and Rn are \[~-\,152{}^\circ \,C\] and \[-\,62{}^\circ C\] respectively. Find the approximate boiling point of Xe.
question_answer2) How much energy in joules must be needed to convert all the atoms of sodium to sodium ions present in 2.3 mg of sodium vapours? Given: Ionisation energy of sodium is\[495\text{ }kJ\,mo{{l}^{-1}}\].
question_answer3) The ionization energy of lithium is \[520\text{ }kJ\text{ }mo{{l}^{-1}}.\] Find the amount of energy (in kJ) required to convert 70 mg of lithium atoms in gaseous state into \[L{{i}^{+}}\] ions.
question_answer4) The electron affinity of bromine (g) is 3.9 eV. How much energy in kJ is released when 10.0 g of bromine is converted completely to \[B{{r}^{-}}\] in gaseous state? [Given. Atomic mass of Br = 80; 1 eV =\[96.3\text{ }kJ\text{ }mo{{l}^{-1}}\]].
question_answer5) How many pairs are there in the following options in which first species has lower ionisation energy than second species? (i) N and O (ii) Br and K (iii) Be and B (iv) \[I\text{ }and\text{ }{{I}^{}}\] (iv) \[\,Li\text{ }and\,\,L{{i}^{+}}\] (v) O and S (vii) Ba and Sr
question_answer6) How many elements of the following are electropositive element(s)? Sodium, calcium, germanium and polonium and chlorine.
question_answer7) An element 'X' has its electronic configuration of 'K' shell \[(n-5){{s}^{2}}\]and the total number of electrons in its outer-most, penultimate and antepenultimate shell are 2, 8 and 25 respectively, then find out the total number of unpaired electrons in element 'X' in its ground state.
question_answer8) Find the total number of element(s) from the following which have only single oxidation state (other than zero) in their corresponding stable compounds Cs, Ba, F, Zn, Be, Al, Sr, Ga, Pb
question_answer9) Consider the following order: (i) \[\operatorname{HF} > HCl > HBr > HI\]: Lewis basic character (ii) \[C{{H}_{4}}<CC{{l}_{4}}<C{{F}_{4}}:\] Electronegativity of central ?C? - atom (iii) \[M{{g}^{2+}}<{{K}^{+}}<{{S}^{2-}}<S{{e}^{2-}}:\]Ionic radius (iv) \[Ni>Pd>Pt:\] Ionisation energy (v) \[A{{s}^{5+}}>S{{b}^{5+}}>B{{i}^{5+}}\]: Stable oxidation state (vi) \[LiF>NaF>KF>RbF:\] Lattice energy (vii) \[{{F}^{-}}\text{(}aq.\text{)}>C{{l}^{-}}\,\,\text{(}aq.\text{)}>B{{r}^{-}}\text{(}aq.\text{)}>{{I}^{-}}\text{(}aq.\text{)}\]: Electrical conductance (viii) \[L{{i}^{+}}<M{{g}^{2+}}<A{{l}^{3+}}\]: Hydration energy (ix) \[Cl>Br>F>I:\] Electron affinity (x) \[BeC{{l}_{2}}<AlC{{l}_{3}}<SiC{{l}_{4}}:\] Lewis acidic character. Then calculate value of (x - y), where x and y are correct and incorrect orders respectively.
question_answer10) Among the following, find the number of elements showing only one non-zero oxidation state O, Cl, F, N, P, Sn, Tl, Na, Ti
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