From the given cells:

Lead storage cell, Mercury cell, Fuel cell and Dry cell

Answer the following:

A. Which cell is used in hearing aids?

B. Which cell was used in Apollo Space Programmed?

C. Which cell is used in automobiles and inverters?

D. Which cell does not have long life?

Write the IUPAC name of the given compound:

Write the main reason for the stability of colloidal sols.

When chromite ore is fused with NaOH in presence of air, a yellow coloured compound (A) is obtained which on acidification with dilute sulphuric acid gives a compound (B). Compound (B) on reaction with KCl forms a orange coloured crystalline compound (C).

A. Write the formulae of the compounds (A), (B) and (C)

B. Write one use of compound (C).

Complete the following chemical equations:

A.

B.