1.

What is the effect of temperature on chemisorption?

What is the role of zinc metal in the extraction of silver?

What is the basicity of H₃PO₃?

Identify the chiral molecule in the following pair:

An element with density 2.8 g cm−3 forms of the f.c.c. unit cell with edge length 4 X10⁻⁸ cm. Calculate the molar mass of the element.
(Given: NA = 6.022 X 10²³ mol ⁻¹)

(i) What type of non-stoichiometric point defect is responsible for the pink colour of LiCl?
(ii) What type of stoichiometric defect is shown by NaCl?

OR
How will you distinguish between the following pairs of terms:
(i) Tetrahedral and octahedral voids
(ii) Crystal lattice and unit cell.

State Kohlrausch's law of independent migration of ions. Why does the conductivity of a solution decrease with dilution?

For a chemical reaction R → P, the variation in the concentration (R) vs. time (t) plot is given as,


(i) Predict the order of the reaction.
(ii) What is the slope of the curve?

Explain the principle of the method of electrolytic refining of metals. Give one example.

Complete the following equations:

(i) P₄ + H₂O →
(ii) XeF₄ + O₂F₂ →