Q.8.Chlorine water loses its yellow colour on standing because:
(a) HCl gas is produced.due to the action of sunlight.
(b) a mixture of HOCl and HCl is produced in presence of sunlight .
(c)HOCl and Hydrogen gas is produced .
(d)a mixture of HCl and `ClO_3` is produced due to the action of sunlight.

Which of the following statements are correct? a) The electrolysis of aquious NaCl produces hydrogen gas at cathode and chlorine gas at anode, b) The electrolysis of a CuSO_(4) solution using Pt electrodes causes the liberation of O_(2) at the anode and the deposition of copper at the cathode. c) Oxygen and hydrogen are produced at the anode and cathode during the electrolysis of dilute aqueous solution of H_(2)SO_(4) d) All electrolytic reactions are redox reactions

A Student carries out the decomposition reaction of lead nitrate to form three simpler substances. One of the substances formed during this reaction is a brown coloured gas wheras another substance formed is a yellow coloured solid. (a) what is the colour of lead nitrate ? (b) How is the decomposition reaction of lead nitrate carried out ? (c) name the brown coloured gas produced in this reaction. (d) name the yellow solid formed in the reaction.

An inorganic Compound (A) has garnet red prismatic crystals. (A) is modertely soluble in water and dissolved in cold concentrated H_(2)SO_(4) to yield red crystal (B) . In presence of dilute H_(2)SO_(4) it converts a pungent gas (C ) into yellow turbidity (D) and converts a Suffocating gas (E) into a green solution (F) . the gas (C ) and (E) also combine to produced the yellow turbidity (D) . With KI and starch in presence of dilute. H_(2)SO_(4) (A) and concentrated H_(2)SO_(4) Mixture used as a cleansing agent for glassware in the laboratory . identify (A) and explain the reactions.

When a piece of limestone reacts with dilute HCl , a gas X is produced. When gas X is passed through lime water then a white precipitate Y is formed. On passing excess of gas X, the white precipitate dissolves forming a soluble compound Z. (a). What are X, Y and Z? (b). Write equations for the reactions which take place: (i). When limestone reacts with dilute HCl (ii). When gas X reacts with lime water to form white precipitate Y (iii). When excess of gas X dissolves white precipitate Y to form a soluble compound Z.