Write down the name of brown precipitate formed during the reaction of `FeCl_3` solution and `NH_4OH` solution.

Write down the name of the solvent used in the oxymercuration reaction of propene.

Write down the reactions involved during the formation of photochemical smog.

Write down the formula of the black precipitate formed when H_2S gas is passed through an aqueous solution of lead nitrate?

Write the dissociation reaction of HCl in aqueous solution?

A solution of KMnO_(4) on reduction yields either a colourless solution or a brown precipitate or a green solution depending on pH of the solution. What different stages of the reduction do these represent and how are they carried out ?

Write the units of reaction-rate for reactions occurring in solutions and in gaseous medium.

Red precipitate formed in Cu_2Cl_2 + NH_4 OH soft when

Writ down the balanced chemcial equation for the reaction of H_2S with aqueous solution of SO_2 and write the roles (oxidant/reductant) of the reactants in the reaction.

Write down the full forms of T_3 and T_4 hormones.

Aqueous solution of sodium hydroxide is added drop wise to solution of gallium chloride in water. A precipitate is initially formed. The precipitate dissolves on furthur addition of NaOH solution. Explain the observation using suitable chemical reactions.