If Ksp of Ag2CO3 is 8 $$\times$$ 10–12, the molar solubility of Ag2CO3 in 0.1 M AgNO3 is -

A mixture of 100 m mol of Ca(OH)2 and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100 mL. The mass of calcium sulphate formed and the concentration of OH– in resulting solution, respectively, are : (Molar mass of Ca (OH)2, Na2SO4 and CaSO4 are 74, 143 and 136 g mol–1 , respectively; Ksp of Ca(OH)2 is 5.5 × 10–6 )

The pH of rain water, is approximately :

In an acid-base titration, 0.1 M HCl solution was added to the NaOH solution of unknown strength. Which of the following correctly shows the change of pH of the titraction mixture in this experiment?

The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:

The electrons are more likely to be found :

The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are :

The graph between $${\left|\psi \right|}^2$$ and r (radial distance) is shown below. This represents :

The isoelectronic set of ions is :

Which one of the following about an electron occupying the 1s orbital in a hydrogen atom is incorrect ? (The Bohr radius is represented by a0)

For any given series of spectral lines of atomic hydrogen, let $$\Delta \stackrel{\_}{v}=$$ $$\Delta {\overline{v}}_{\max }-\Delta {\overline{v}}_{\min }$$ be the difference in maximum and minimum frequencies in cm–1. The ratio Lyman Balmer {{\Delta {{\overline v }_{Lyman}}} \over {\Delta {{\overline v }_{Balmer}}}} is :

If p is the momentum of the fastest electron ejected from a metal surface after the irradiation of light having wavelength $$\lambda$$, then for 1.5 p momentum of the photoelectron, the wavelength of the light should be: (Assume kinetic energy of ejected photoelectron to be very high in comparison to work function)

The quantum number of four electrons are given below : n = 4, l = 2, ml =–2, ms = –1/2 n = 3, l = 2, ml = 1, ms = +1/2 n = 4, l = 1, ml = 0, ms = +1/2 n = 3, l = 1, ml = 1, ms = –1/2 The correct order of their increasing enegies will be :

If the de Broglie wavelength of the electron in nth Bohr orbit in a hydrogenic atom is equal to 1.5 $$\pi$$a0 (a0 is Bohr radius), then the value of n/z is -

The upper stratosphere consisting of the ozone layer protects us from sun's radiation that falls in the wavelength region of -

The highest value of the calculated spin only magnetic moment (in BM) among all the transition metal complexes is :

For emission line of atomic hydrogen from ni = 8 to nf = n, the plot of wave number $$\left(\overline{v}\right)$$ against \left( {{1 \over {{n^2}}}} \right) will be (The Rydberg constant, RH is in wave number unit)

Which of the following combination of statements is true regarding the interpretation of the atomic orbitals ? (a) An electron in an orbital of high angular momentum stays away from the nucleus than an electron in the orbital of lower angular momentum. (b) For a given value of the principal quantum number, the size of the orbit is inversely proportional to the azimuthal quantum number. (c) According to wave mechanics, the ground state angular momentum is equal to {h \over {2\pi }}. (d) The plot of $$\psi$$ vs r for various azimuthal quantum numbers, shows peak shifting towards higher r value.

Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface ?

Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H atom is suitable for this purpose? [RH = 1 $$\times$$ 105 cm–1, h = 6.6 $$\times$$ 10–34 Js, c = 3 $$\times$$ 108 ms–1]