Which of the following statements is INCORRECT ?A. Generally the radius trend and the ionization energy trend across a period are opposites.B. metallic and covalent radii of potassium are `2.3A` and `2.03A` respectively.C. Amongst `Li^(-),Be^(-)` and `C^(-),Li^(-)` is least stable ion.D. Atomic and ionic radii of Niobium and Tantalum are almost same

Which of the following statements is INCORRECT ?A. Generally the radiu

1.	Which of the following statements is INCORRECT ?A. Generally the radius trend and the ionization energy trend across a period are opposites.B. metallic and covalent radii of potassium are `2.3A` and `2.03A` respectively.C. Amongst `Li^(-),Be^(-)` and `C^(-),Li^(-)` is least stable ion.D. Atomic and ionic radii of Niobium and Tantalum are almost same
Answer» Correct Answer - 3 `(1)` Across the period, size decreases as electrons are added in the same shell and nuclear charge increases by one unit for additon of each successive element. In contrary , the ionization energy increases as size of atom decreases and nuclear charge increases. `(2) r_("metallic")gtr_("covalent")(` covalent bond formation involves the overlapping of orbitals). `(3)._(3)Li^(-)-1s^(2)2s^(2)` completely filled stable configuration , so more stable. `._(4)Be^(-)-1s^(2)2s^(2)2p^(1)` `._(5)B^(-)-1s^(2)2s^(2)2p^(2)` `._(6)C^(-)-1s^(2)2p^(3)` half filled stalbe stable configuration , so more stable. `(4)` Due to lanthanide contraction.

Discussion

No Comment Found

Related InterviewSolutions

Choose the correct ordera). `Si lt P lt Cl lt S ` (2nd ionisation energy)b)`F lt O lt N lt C` (2nd ionsiation energy)c)`F gt C gt Br gt I` (electronegativity)d)`Be^(2+) lt Li^(+) lt Na^(+) lt K^(+)` (Mobility of ion in aqueous solution )A. `Si lt P lt Cl lt S ` (2nd ionisation energy)B. `F lt O lt N lt C` (2nd ionsiation energy)C. `F gt C gt Br gt I` (electronegativity)D. `Be^(2+) lt Li^(+) lt Na^(+) lt K^(+)` (Mobility of ion in aqueous solution )
S-1:- `Na_(2)O lt MgO lt ZnO lt P_(4)O_(10)` : acidic property S-2:- `Na lt Si gt Mg gt Al` : First ionisation potential S-3:- `F gt Cl gt Br` : Electron affinity. S-:- `Te^(2-) gt I^(-) gt Cs^(+) gt Ba^(2+)` : Ionic sizeA. TTTTB. TTFTC. TFFTD. TFTT
Which of the following is/are correct order regarding radius ?a)`Al^(3+) lt Mg^(2+) lt Na^(+)`b)`B^(3+) lt Ga^(3+) lt Al^(3+)`c)`Be^(2+) lt B^(3+) lt Li^(+)`d)`Cl^(-) lt S^(2) lt P^(3-)`A. `Al^(3+) lt Mg^(2+) lt Na^(+)`B. `B^(3+) lt Ga^(3+) lt Al^(3+)`C. `Be^(2+) lt B^(3+) lt Li^(+)`D. `Cl^(-) lt S^(2) lt P^(3-)`
Which of the following statements (s) is/are not true about the diagonal relationship of `Be` and `Al`?A. Both reacts with alkali to liberate hydrogenB. Their oxides are basicC. They are made passive by nitric acidD. Their carbides give acetylene on treatment with water .
Which of the following are correct ?A. The configuration of Mo`(Z = 42)` is [Kr] `4d^(5) 5s^(1)`B. The configuration of Mo(Z= 42) is [Kr] `4d^(4) 5s^(2)`C. The configurtion of Ag(Z = 47) is [Kr] `4d^(10) 5s^(1)`D. The configurationof Ag (Z= 47) is [Kr] `4d^(10) 5s^(2)`
Which of the following is / are the correct order of mobility in aqueous solutions ?a)`Li^(+) lt Na^(+) lt K^(+)`b)`Na^(+) lt Mg^(2+) lt Al^(3+)`c)`Al^(3+) lt Mg^(2+) lt Na^(+)`d)`Li^(+) gt Na^(+) gt K^(+)`A. `Li^(+) lt Na^(+) lt K^(+)`B. `Na^(+) lt Mg^(2+) lt Al^(3+)`C. `Al^(3+) lt Mg^(2+) lt Na^(+)`D. `Li^(+) gt Na^(+) gt K^(+)`
Which of the following is / are the correct order of mobility in aqueous solutions ?A. `Li^(+) lt Na^(+) lt K^(+)`B. `Na^(+) lt Mg^(2+) lt Al^(3+)`C. `Al^(3+) lt Mg^(2+) lt Na^(+)`D. `Li^(+) gt Na^(+) gt K^(+)`
In most of the lanthanides, the penultimate shell contains __________electrons in __________ orbitals.
Which of the following has the same number of electrons in its outermost shell and penultimate shell ?A. `AI^(3+)`B. `Ca^(2+)`C. `F^(-)`D. `N^(3-)`
Which group of elements is analogous to the lanthanides?A. HalidesB. ActinidesC. ChalcogenidesD. Borides

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment