100 mL of 0.1 M HCl is taken in a beaker and to it 100 mL of 0.1 M NaOH is added in steps of 2 mL and the pH is continuously measured. Which of the following graphs correctly depicts the change in pH?

For the following Assertion and Reason, the correct option is Assertion (A): When Cu (II) and sulphide ions are mixed, they react together extremely quickly to give a solid. Reason (R): The equilibrium constant of Cu2+(aq) + S2–(aq) ⇌ CuS(s) is high because the solubility product is low.

The solubility product of Cr(OH)3 at 298 K is 6.0 × 10–31. The concentration of hydroxide ions in a saturated solution of Cr(OH)3 will be :

The Ksp for the following dissociation is 1.6 × 10–5 $$PbC{l}_{2(s)}\leftrightharpoons P{b}_{(aq)}^{2+}+2C{l}_{(aq)}^{-}$$ Which of the following choices is correct for a mixture of 300 mL 0.134 M Pb(NO3)2 and 100 mL 0.4 M NaCl ?

For the following Assertion and Reason, the correct option is : Assertion : The pH of water increases with increase in temperature. Reason : The dissociation of water into H+ and OH– is an exothermic reaction.

The strength of an aqueous NaOH solution is most accurately determined by titrating : (Note : consider that an appropriate indicator is used)

The stoichiometry and solubility product of a salt with the solubility curve given below is, respectively :

The number of subshells associated with n = 4 and m = –2 quantum numbers is

The correct statement about probability density (except at infinite distance from nucleus) is :

The difference between the radii of 3rd and 4th orbits of Li2+ is R1 . The difference between the radii of 3rd and 4th orbits of He+ is $$\Delta$$R2 . Ratio $$\Delta$$R1 : $$\Delta$$R2 is :

The shortest wavelength of H atom in the Lyman series is $$\lambda$$1. The longest wavelength in the Balmar series of He+ is :

The region in the electromagnetic spectrum where the Balmar series lines appear is :

Consider the hypothetical situation where the azimuthal quantum number, $$l$$, takes values 0, 1, 2, ....., n + 1, where n is the principal quantum number. Then, the element with atomic number :

The figure that is not a direct manifestation of the quantum nature of atoms is :

The de Broglie wavelength of an electron in the 4th Bohr orbit is :

Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x), (y) and (z), the sum of (x), (y) an (z) is :

The radius of the second Bohr orbit, in terms of the Bohr radius, a0, in Li2+ is :

For the Balmer series in the spectrum of H atom, \overline \nu = {R_H}\left\{ {{1 \over {n_1^2}} - {1 \over {n_2^2}}} \right\}, the correct statements among (I) to (IV) are : (I) As wavelength decreases, the lines in the series converge (II) The integer n1 is equal to 2 (III) The lines of longest wavelength corresponds to n2 = 3 (IV) The ionization energy of hydrogen can be calculated from wave number of these lines

The number of orbitals associated with quantum number n = 5, ms = +{1 \over 2} is :

The correct order of the ionic radii of O2–, N3–, F– , Mg2+, Na+ and Al3+ is :