Which of the following ions is the largest in size?

Which of the following has the smallest size?

Among the following oxides, the one which is most basic is

Which of the following has largest size?

Na+, Mg²+, Al³+ and Si4+ are isoelectronic. The order of their ionic size is

In the periodic table from left to right in a period,
the atomic volume

Which electronic configuration of an element has abnormally high difference between second and third ionization energy?

One of the characteristic properties of non-metals is
that they

Which one of the following has minimum value of cation/anion ratio?

The dissociation constant of a weak acid is 1 x 10 -4
In order to prepare a buffer solution with a pH = 5,
the [Salt]/[Acid] ratio should be

Buffer solutions have constant acidity and alkalinity because

A buffer solution is prepared in which the
concentration of NH3is 0.30 M and the
concentration of NH4+ is 0.20 M. If the equilibrium constant, Kb for NH3 equals 1.8 x 10 -5 what is the pH of this solution? (log 2.7 = 0.43)

In a buffer solution containing equal concentration
of B- and HB, the Kb for B- is 10 -10, The pH of buffer

Which of the following pairs constitutes a buffer?

On electrolysis of dil. sulphuric acid using platinum
(Pt) electrode, the product obtained at anode will be

The number of Faradays (F) required to produce
20 g of calcium from molten CaCl, (Atomic mass of
Ca = 40 g mol) is

During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas usinga current of 3 amperes is (in min)

The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge on electron = 1.60 x 10-19 C)

When 0.1 mol MnO4 -2 is oxidised, the quantity of electricity required to completely oxidise MnO4 -2to
MnO4 - is