In the lab three students were asked to prepare a colloidal solution. Student A .: Added starch powder into hot water. Student B : Added a small amount of ferric chlorideInto freshlyprepared ferric hydroxide. Student C : Added soap In to water.Name the process adopted by student B.

In the lab three students were asked to prepare a colloidal solution. Student A .: Added starch powder into hot water. Student B : Added a small amount of ferric chlorideInto freshlyprepared ferric hydroxide. Student C : Added soap In to water. Identify amacromolecular colloid and an associated colloid from the three colloids prepared.

In the lab three students were asked to prepare a colloidal solution. Student A .: Added starch powder into hot water. Student B : Added a small amount of ferric chlorideInto freshly prepared ferric hydroxide. Student C : Added soap In to water.Which type of colloid was prepared by student A, lyophoblc sol or lyophillcsol ?

Raju and Ramu were asked to prepare a colloidal solution each. Raju added starch powder into water while Ramu added saturated FeCl_3 solution ito excess boiling water. What type of colloid did Raju and Ramu prepare?

In an attempt to prepare ferric hydroxide sol by adding small amount of ferric chloride to water, one person got a precipitate of ferric hydroxide. How can you help him to convert Fe(OH)_3 precipitate to Fe(OH)_3 sol?

Ferric hydroxide sol can be prepared from freshly prepared ferric hydroxide precipitate. It can also be prepared by adding ferric chloride solution to boiling water. In both cases the sol particles are positively charged. What happenswhen an electric pot ential is applied across two platinum electrodes dipping in" ferric hydroxide sol? Explain.

Ferric hydroxide sol can be prepared from freshly perpared ferric hydroxide precipitate. It can also be prepared by adding ferric chloride solution to boilling water. In both cases the sol particles are positively charged. Name the above two methods of preparation of ferric hydroxide sol.

In a lab work, a teacher has given zinc salt solution for systematic analysis to two students studetn I added NH_4Cl followed by NH_4OH and student II added NH_4OH followed by NH_4Cl for the analyse of group III cations. Predict the observation of each student. Give reasons for difference in observation in any.

A study tour of secondary class students team visited a tissue culture laboratory noticed a chemical labelled as " agar-agar" is adding to the culture medium. The same team visited an icecream factory happened to see the same material adding in the icecream mix. They asked the following questions to the teacher. (a) what is agar- agar? (b) Is it poisonous (c) What is the common purpose to using this? (d) How are they synthesized? Imagine that you are the teacher who is facing these queastions. Clarify the doubts of the students.

i. A student treated CaC_2 with water and the gas formed is passed through a red hot tube. What will be the product? ii. You are provided with the following substances. a. CH_3 Cl , sodium and dry ether b. Benzene, CH_3 Cl and AlCl_3 i. Name the products formed in each case. ii. Name the reactions.