GATE CY 2011 Question Paper (13-Feb-2011) (Shift-2)

For a 1 molal aqueous NaCl solution, the mean ionic activity coefficient (${\gamma }_{\pm }$) and the Debye- Hückel Limiting Law constant (A) are related as

For the concentration cell

M | M${}^{+}$ (aq, 0.01 mol dm${}^{-3}$) || M${}^{+}$ (aq, 0.1 mol dm${}^{-3}$) | M

the EMF (E) of the cell at a temperature (T) equals

A hypothetical molecule XY has the following properties

Reduced mass: $2\times 10^{-26}$ kg

X-Y bond length: 100 pm

Force constant of the bond: $8\times 10^2$ N.m${}^{-1}$

A hypothetical molecule XY has the following properties

Reduced mass: $2\times 10^{-26}$ kg

X-Y bond length: 100 pm

Force constant of the bond: $8\times 10^2$ N.m${}^{-1}$

Na${}_2$ HPO${}_4$ and NaH${}_2$ PO${}_4$ on heating at high temperature produce a chain sodium pentaphosphate quantitatively.