Name the phenomenon/process involved i) mixing of hydrated ferric oxide ( +ve sol) and arsenious sulphide ( -ve sol) ii) An impure sol is purified by removing dissolved particles using suitable membrane iii) Movement of dispersion medium is observed in an electric field.

Name the organic product formed when chloroalkane is heated with concentrated solution of sodium iodide (Nal) in acetone.

Name the phenomenon responsible for (i) advance of sunrise (ii) colour of water in deep sea (iii) twinkling of stars and (iv) reddish appearance of the sun at the time of sunrise and sunset.

Name the phenomenon responsible for (i) advance of sunrise (ii) colour of water in deep sea (iii) twinkling of stars and (iv) reddish appearance of the sun at the time of sunrise and sunset.

(a) (i) Name the organic product formed when chloroalkane is heated with concentrated solution of sodium iodide (Nal) in acetone? (ii) Write the chemical equation for the above reaction (iii) Name the above reaction. (b) Explain Fittig's reaction with an equation.

(a) Crystals of a substance their colour on heating in a closed test tube but regained it after sometime when they were allowed to cool down. Name the substance and write its formula and explain the phenomenon involved. (b) name the acid and base that would be used to prepare the following salts: (i) Potassium sulphate (ii) Ammonium chloride.

Write the equation for the reaction between benzaldehyde and concentrated NaOH solution. Name the reaction.

Write the equation for the reaction between benzaldehyde and concentrated NaOH solution. Name the reaction.

Two coils of insulated copper wire are wound over a non conducting cylinder as shown. Coil I has larger number of turns. (i) Write your observations when, (a) key K is dosed, (b) key K is opened, (ii) Give reason for your observations. (iii) Mention the name of the phenomenon involved and define it. (iv) Name of two coils used ln this experimenl (v) State the rule which gives the direction of induced current