In Van der Waals equation of state of the gas law, the constant ‘b’ is a measure of

Which one of the following has the minimum boiling point?

The coordination number of central metal atom in a complex is determined by :

Among the properties (a) reducing (b) oxidising (c) complexing, the set of properties shown by CN– ion towards metal species is :

The correct order of magnetic moments (spin only values in B.M.) among is : (Atomic numbers: Mn = 25; Fe = 26, Co =27)

Which one the following has largest number of isomers? (R = alkyl group, en = ethylenediamine)

Coordination compound have great importance in biological systems. In this context which of the following statements is incorrect?

Which one of the following complexes in an outer orbital complex?

The conjugate base of H2PO4- is :

The molar solubility (in ol L-1) of a sparingly soluble salt MX4 is "s". The corresponding solubility product is Ksp. 's' is given in term of Ksp by the relation :

Which of the following sets of quantum numbers is correct for an electron in 4f orbital?

Consider the ground state of Cr atom (Z = 24). The number of electrons with the azimuthal quantum numbers, l = 1 and 2 are respectively

The wavelength of the radiation emitted when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1.097 $$\times$$ 107 m-1)

Which one of the following sets of ions represents the collection of isoelectronic species? (Atomic nos. : F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)

Which one of the following ions has the highest value of ionic radius?

Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is

The formation of the oxide ion O2-(g) requires first an exothermic and then an endothermic step as shown below O(g) + e- = $$O_{(g)}^{-}$$ $$\Delta$$Ho = -142 kJmol-1 $$O_{(g)}^{-}$$ + e- = $$O_{(g)}^{2-}$$ $$\Delta$$Ho = 844 kJmol-1 This because

What type of crystal defect is indicated in the diagram below?

The compound formed on heating chlorobenzene with chloral in the presence concentrated sulphuric acid is

In a first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is