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Q. The set representing the correct order of ionic radius is ?(1) $\mathrm{Li}^{+}>\mathrm{Na}^{+}>\mathrm{Mg}^{2+}>\mathrm{Be}^{2+}$(2) $\mathrm{Mg}^{2+}>\mathrm{Be}^{2+}>\mathrm{Li}^{+}>\mathrm{Na}^{+}$(3) $\mathrm{Li}^{+}>\mathrm{Be}^{2+}>\mathrm{Na}^{+}>\mathrm{Mg}^{2+}$(4) $\mathrm{Na}^{+}>\mathrm{Li}^{+}>\mathrm{Mg}^{2+}>\mathrm{Be}^{2+}$ [AIEEE 2009]
Q. The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I, having atomic number 9, 17, 35 and 53 respectively, is ?(1) I > Br > Cl > F(2) F > Cl > Br > I(3) Cl > F > Br > I(4) Br > Cl > I > F [AIEEE 2011]
Q. The increasing order of the ionic radii of the given isoelectronic species is ?(1) $\mathrm{K}^{+}, \mathrm{S}^{2-}, \mathrm{Ca}^{2+}, \mathrm{Cl}^{-}$(2) $\mathrm{Cl}^{-}, \mathrm{Ca}^{2+}, \mathrm{K}^{+}, \mathrm{S}^{2-}$(3) $\mathrm{S}^{2-}, \mathrm{Cl}^{-}, \mathrm{Ca}^{2+}, \mathrm{K}^{+}$(4) $\mathrm{Ca}^{2+}, \mathrm{K}^{+}, \mathrm{Cl}^{-}, \mathrm{S}^{2-}$ [AIEEE 2012]
Q. Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar ?(1) Ca < S < Ba < Se < Ar(2) S < Se < Ca < Ba < Ar(3) Ba < Ca < Se < S < Ar(4) Ca < Ba S < Se < Ar [JEE-Main 2013]
Q. The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of $\mathrm{Na}^{+}$ will be?(1) – 2.55 eV(2) – 5.1 eV(3) – 10.2 eV(4) + 2.55 eV [JEE-Main 2013]
Q. Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to:(1) Smaller size of chlorine atom(2) Bigger size of 2p orbital of fluorine(3) High ionization enthalpy ol fluorine(4) Smaller size of fluorine atom [JEE-MAIN 2013 (OnLine)]
Q. The order of increasing sizes of atomic radii among the elements O, S, Se and As is ?(1) As < S < O < Se(2) O < S < As < Se(3) Se < S < As < O(4) O < S < Se < As [JEE-MAIN 2013 (OnLine)]
Q. Which is the correct order of second ionization potential of C, N, O and F in the following?(1) O > F > N > C(2) O > N > F > C(3) C > N > O > F(4) F > O > N > C [JEE-MAIN 2013 (OnLine)]
Q. Which of the following series correctly represents relations between the elements from X to Y ?
[JEE-MAIN 2014 (OnLine)]
[JEE-MAIN 2014 (OnLine)]
Q. Which of the following atoms has the highest first ionization energy ?(1) Sc(2) Rb(3) Na(4) K [JEE-MAIN 2016]
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Sol. (1)Due to poor shielding of d-electrons in Sc, $Z_{\mathrm{eff}}$ of Sc becomes more so that ionisation energy of Sc is more than Na, K and Rb.
Q. The group having isoelectronic species is :-(1) $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$(2) $\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{+}$(3) $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{2+}$(4) $\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$ [JEE-MAIN 2017]
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