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Magazine Problem 58
The first ionisation enthalpies of four consecutive elements present in the second period of the periodic table are \(8.3\), 11.3, \(14.5\) and \(13.6 \mathrm{eV}\) respectively. Which one of the following is the first ionisation enthalpy of nitrogen? |E,A,M,C.E.T. (Med,) 2004] (a) \(13.6\) \(\square\) (b) \(14.5\) (c) \(11.3\) \(\square\) (d) \(8.3\)
Problem 59
Lowest ionisation enthalpy in periods is shown by: (a) inert gases \(\square\) (b) halogens \(\square\) (c) alkali metals \(\square\) (d) alkaline earth metals \(\square\)
Problem 62
The elements with atomic numbers \(10,18,36,54\) and 86 are all: (a) light metals \(\square\) (b) inert gases \(\square\) (c) halogens \(\square\) (d) rare-earths .
Problem 63
The elements on the right side of the periodic table are: (a) non-metals \(\square\) (b) metals (c) transition elements \(\square\) (d) metalloids -
Problem 64
The elements on the right side of the periodic table are: (a) non-metals \(\square\) (b) metals (c) transition elements \(\square\) (d) metalloids -
Problem 65
Which of the following atoms has the largest atomic radius? (a) \(\mathrm{Cs}\) \(\square\) (b) Ba (c) \(\mathrm{Pb}\) \(\square\) (d) \(\mathrm{Cu}\)
Problem 66
Which of the following is the weakest acid? (a) HF \(\square\) (b) \(\mathrm{HCl}\) (c) \(\mathrm{HBr}\) \(\square\) (d) HI
Problem 67
The correct order of relative stability of half filled and completely filled
shells is :
(a) \(p^{3} Problem 68 The electronic configuration of an element \(A\) is \(1 s^{2}, 2 s^{2} 2 p^{5}\).
The formula of substance containing only \(A\) will be:
(a) \(A\)
\(\square\) (b) \(A_{2}\) [
(c) \(A_{5}\)
\(\square\) (d) \(A_{7}\) \(-\) Problem 69 The electronic configuration of element \(A\) is \(1 s^{2}, 2 s^{2} 2 p^{6}\), \(3
s^{2}\) while of the element \(B\) is \(1 s^{2}, 2 s^{2} 2 p^{5}\). The formula of
the compound containing \(A\) and \(B\) will be:
(a) \(A B\)
\(\square\) (b) \(A_{2} B\)
(c) \(A B_{2}\)
\(\square\) (d) \(A_{2} B_{6}\)
