Chemistry Test ...

If the anions (A) form hexagonal close packing and cations (B) occupy only 2/3^rd octahedral voids in it, then the general formula of the compound is :

In an ionic solid r₍₊₎  = 1.6 Å and r₍₊₎ = 1.864 Å. Use the radius ratio rule to determine the edge length of the cubic unit cell in Å.

Three lines are drawn from a single corner of an FCC unit cell to meet the other corner such that they are found to pass through exactly only 1 octahedral void, no voids of any type and exactly 2 tetrahedral voids with 1 octahedral void. Identify the line in the same order.

Platinum crystallises in a face centered cube crystal with a unit cell length of 3.9231 Å. The density and atomic radius of platinum are respectively. [Atomic mass of Pt = 195]

A 0.2 molal aqueous solution of a weak acid (HX) is 20 percent ionised. The freezing point of this solution is (Given k_f = 1.86º C kg mol^–1 for water) :

The vapour pressure of the solution of two liquids A(pº = 80 mm) and B(pº = 120 mm) is found to be 100 mm when x_A = 0.4. The result shows that :

A 0.004 M solution of Na₂SO₄ is isotonic with 0.010 M solution of glucose at same temperature. The apparent percentage dissociation of Na₂SO₄ is :

Consider equimolal aqueous solutions of NaHSO₄ and NaCI with ΔT_b and ΔT'_b as their respective boiling point elevations. The value of 

The reduction potential of hydrogen half cell will be negative if (T = 298 K) :

Aqueous solution of Na₂SO₄ containing a small amount of Phenolphthalein is electrolysed using Pt-electrodes. The colour of the solution after some time will