Which of the following are wrong? a)Nobl...

Which of the following are wrong? a)Noble gases have highest IE in respective periods b)ZnO is amphoteric oxide c)Ionic radius is inversely proportional to effective nuclear charge d)Zn, Cd, Hg have high boiling points among d-block elements

Noble gases have highest IE in respective periods

ZnO is amphoteric oxide

Ionic radius is inversely proportional to effective nuclear charge

Zn, Cd, Hg have high boiling points among d-block elements

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If vec a and vec b are two collinear vectors, then which of the following are incorrect:(A) vec b=lambda vec a , for some scalar lambda (B) vec a=+- vec b (C) the respective components of vec a and vec b are proportional (D) both the vectors vec a and vec b have same direction, but different magnitudes.

Pauling give method to calculate univalent ion radii by assuming that (i) In ionic crystal (let M^(+)X^(-)) cations and anions are is contact of eac other and sum of their radii is equal to interionic distance, i.e., d_((M^(+)-X^(-))) = r_(M^(+) +r_(X^(-)) (ii) The radius of an ion having noble gas configuration is inversely proportional to the effective nuclear charge felt at the periphery of the ion, i.e., r_((M^(+))) = (C)/(Z_(eff(M^(+)))) and r_((X^(-))) = (C)/(Z_(eff(X^(-)))) Here C is constant of proportionality whose value depends on electronic configuration of ion. Thus, d_((M^(+)-X^(-))) =(C)/(Z_(eff(M^(+)))) +(C)/(Z_(eff(X^(-)))) pm Z_(eff) is the effective nuclear charge whose value can be calculated by the formula: Z_(eff) = Z - sigma . Here sigma is shielding constant and for neon, the value of sigma when calculate by Slater's rule is found to be 4.5 The value of 'C' for Na^(+), Mg^(2+) and Al^(3+) will be in the order:

Pauling give method to calculate univalent ion radii by assuming that (i) In ionic crystal (let M^(+)X^(-)) cations and anions are is contact of eac other and sum of their radii is equal to interionic distance, i.e., d_((M^(+)-X^(-)) = r_(M^(+) +r_(X^(-)) (ii) The radius of an ion having noble gas configuration is inversely proportional to the effective nuclear charge felt at the periphery of the ion, i.e., r_((M^(+))) = (C)/(Z_(eff(M^(+)))) and r_((X^(-))) = (C)/(Z_(eff(X^(-)))) Here C is constant of proportionality whose value depends on electronic configuration of ion. Thus, d_((M^(+)-X^(-))) =(C)/(Z_(eff(M^(+)))) +(C)/(Z_(eff(X^(-)))) pm Z_(eff) is the effective nuclear charge whose value can be calculated by the formula: Z_(eff) = Z - sigma . Here sigma is shielding constant and for neon, the value of sigma when calculate by Slater's rule is found to be 4.5 The value of univalent radii for F^(-) as calculated by Pauling method is (given that interionic distance of NaF = 231 pm):

.Which of the following statements is/are wrong? (a) van der Waal's radius of iodine is more than its covalent radius (b) All isoelectronic ions belong to same period of the periodic table (c) \(I.E._{1}\) of "N" is higher than that of "O" while \(I.E._{2}\) of "O" is higher than that of "N (d) The electron affinity "N" is almost zero while that of "P" is \(74.3kJmol^{-1}\)

Wxplain the following giving suitable reson. (a). Transitin metals of 3d-series doe not react readily with dilute acids to liberate hydrogen although they have high negative reduction potential values. Explain. (b). The atomic radii of the elements in a transition series do not vary much while they do vary in the case of s and p-block elements. Explain. (c). The second and third members in each group of the transition elements group of the transition elements have similar atomic radii. Explain.

A liquid possessing which of the following characteristics will be most suitable for determining the molecular mass of a compound by cryoscopic measurements? a.That having low freezing point and small enthalpy of fusion b.That having high freezing point and small enthalpy of fusion c.That having hifh freezing point and small enthalpy of vapourization d.That having large surface tension

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