Define : (a) Molality (b) Osmotic pressure Write any two' advantages two cubic faces namely face centered (FCC) and body centered (BCC) whose, unit cell edge lengths are 3*5Å and 3*0 Å respectively. Find the ratio of the densities of FCC and BCC. Arrange the following oxyacid or chlorine -HCIO HClO_(2), HClO_(3) and HClO_(4) with respect to : (a) Increases order of thermal stability. (b) Increasingorder of oxidising power.

Define : (a) Molality (b) Osmotic pressure Write any two' advantages

1.	Define : (a) Molality (b) Osmotic pressure Write any two' advantages two cubic faces namely face centered (FCC) and body centered (BCC) whose, unit cell edge lengths are 35Å and 30 Å respectively. Find the ratio of the densities of FCC and BCC. Arrange the following oxyacid or chlorine -HCIO HClO_(2), HClO_(3) and HClO_(4) with respect to : (a) Increases order of thermal stability. (b) Increasingorder of oxidising power.
Answer» Solution :(a) MOLALITY : It is defined as the number of moles of solute dissolvedin 1 kg of solvent. (b) Osmotic presure : The excess of pressure applied on the side of solution that stops the net flow of solvent into solution through sem-permeable MEMBRANE, is known as osmotic pressure. Advantage of calomel electrod : (i) It is easy to CONSTRUCT, transport and conveninent to HANDLE. (ii) The potential of the electrod is defiined, reproducible and remains constant. `d=(ZxxM)/(a^(3)xxN)` `(d_(fc c))/(d_(bc c))=(Z_(fc c))/(Z_(bc c))xx(a_(bc c^(3)))/(a_(fc c^(3)))` `=(4)/(2)xx(3^(3))/((3*5)^(3))` `2xx(27)/(43)=(54)/(43)` (a) Increasing order f THERMAL stability: `HCIO gt HCIO_(2) gt HCIO_(3) to HCIO_(4)`