KCl cryatalline in the same type of lattice as does NaCl. Given that `r_(Na^+)/r_(Cl^-)=0.55` and `r_K^+/r_(Cl^-)=0.74`, calculate the ratio of the side of the unit cell for KCl to that of NaCl.

KCl crystallizes int the same type of lattic as done NaCl . Given that r_(Na^(+))//r_(Cl^(-)) = 0.50 and r_(Na^(+))//r_(K^(+)) = 0.70 , Calcualte the ratio of the side of the unit cell for KCl to that for NaCl:

KCl and NaCl have fcc lattice. Calculate the ratio of density of NaCl to that of KCl if the ratio of the edge of NaCl to that of KCl is 0.875.

Calculate the radius of oxygen nucleus .Given that R_0 = 1.1 xx 10^(-15) m .

For a circular coil of radius R and N turns carrying current I, the magnitude of the magnetic field at a point on its axis at a distance x from its centre is given by, B= (mu_0IR^2N)/(2(x^2+R^2)^(3/2)) . Consider two parallel co-axial circular coils of equal radius R, and number of turns N, carrying equal currents in the same direction, and separated by a distance R. Show that the field on the axis around the mid-point between the coils is uniform over a distance that is small as compared to R, and is given by, B=0.72 (mu_0NI)/R approximately.

The resistance of a conductivity cell with 0.1 M KCl solution is found to be 200 ohm at 298K. When the same cell was filled with 0.02 M NaCl solution, the resistance at the same temperature is found to be 1100 ohm . Calculate: the molar conductivity of 0.02 M NaCl solution in S m^2 mol^-1 . Given: Conductivity of 0.1 M KCl solution at 298K = 1.29 S m^-1 .

The resistance of a conductivity cell with 0.1 M KCl solution is found to be 200 ohm at 298K. When the same cell was filled with 0.02 M NaCl solution, the resistance at the same temperature is found to be 1100 ohm . Calculate: the cell constant of the cell in m^-1 . Given conductivity of 0.lM KCl is 1.29 Sm^(-1) ]

The rate of reaction becomes four times when the temperature changes from 293 K to 313 K. Calculate the energy of activation (E _(a)) of the reacton assuming that it does not change with temperature. [ R = 8.314 J K ^(-1) mol ^(-1), log 4 = 0. 6021]

Enthalpy of neutralzation is defined as the enthalpy change when 1 mole of acid // base is completely neutralized by base // acid in dilute solution . For Strong acid and strong base neutralization net chemical change is H^(+) (aq)+OH^(-)(aq)to H_(2)O(l) Delta_(r)H^(@)=-55.84KJ//mol DeltaH_("ionization")^(@) of aqueous solution of strong acid and strong base is zero . when a dilute solution of weak acid or base is neutralized, the enthalpy of neutralization is somewhat less because of the absorption of heat in the ionzation of the because of the absorotion of heat in the ionization of the weak acid or base ,for weak acid /base DeltaH_("neutrlzation")^(@)=DeltaH_("ionization")^(@)+ Delta _(r)H^(@)(H^(+)+OH^(-)to H_(2)O) under same conditions ,how many mL of 0.1 m NaOH and 0.05 M H_(2)A (strong diprotic acid ) solution should be mixed for a total volume of 100mL to producce the hight rise in temperature ?

The radius ratio of an ionic solid r_+/r_- ions is 0.524. The coordination number of this type of structure is

A point R with x-coordinate 4 lies on the line segment joining the points P(2, -3, 4) and Q (8, 0, 10). Find the coordinates of the point R. [Hint Suppose R divides PQ in the ratio k :1. The coordinates of the point R are given by ((8k+2)/(k+1), (-3)/(k+1), (10k+4)/(k+1)) .