Among the following, the pair in which the two species are not isostructural, is
SiF4 and SF4
IO and XeO3
BH
PF and SF6
The helical structure of protein is stabilized by
dipeptide bond
hydrogen bonds
ether bonds
peptide bonds
The dipole moment of HBr is 1.6 × 10-30 cm and inter-atomic spacing is 1 Å. The % ionic character of HBr is
7
10
15
27
Valence bond theory of metallic bond was given by
Dalton
Drudel
Fajan
Pauling
D.
Pauling
Valence bond theory (Resonance theory) of metallic bond was given by pualing (1937). According to this theory, the metallic bonding is essentially covalent in origin and metallic structure exhibits resonance of electro-pair bonds between each atom and its nearest neighbors. In other words, there is a resonance of a large number of canonical forms.
Consider the following ions:
(i) Ni2+ (ii) Co2+ (iii) Cr2+ (iv) Fe3+
(Given, at. no. Cr = 24, Fe = 26, Co = 27, Ni = 28)
The correct order of magnetic moment of these ions is
(i) < (ii) < (iii) < (iv)
(iv) < (ii) < (iii) < (i)
(i) < (iii) < (ii) < (iv)
(iii) < (iv) < (ii) < (i)