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Practice each question, then open the answer or worked solution.
Why is Fe(OH)3 colloid positively charged, when prepared by adding FeCl3 to hot water?
When FeCl3 is added to hot water, the hydrated ferric oxide is formed. This hydrated ferric oxide preferably adsorbs Fe3+ ions resulting in the positively-charged colloid.
Why do physisorption and chemisorption behave differently with rising in temperature?
In physisorption, with an increase in temperature, this bond between adsorbent and adsorbate weaker and the amount of adsorbate decrease whereas in chemisorption an amount of activation energy required for the formation of a bond between adsorbent and adsorbate which is achieved by increasing the temperature.
What happens when dialysis is prolonged?
If the dialysis continues for a long time, the traces of electrolyte present in blood also get completely removed and blood coagulation occurs.
Why does the white precipitate of silver halide become coloured in the presence of dye eosin?
The surface of silver halide acts as a good adsorbent. It can adsorb the pigments of eosin dye, which is coloured. Thus silver halide appears coloured.
What is the role of activated charcoal in a gas mask used in coal mines?
Activated charcoal acts as a good adsorbent as it is porous. In coal mines, the activated charcoal in a gas mask provides fresh air for inhaling.
Class 12 Chemistry NCERT Exemplar Problems on Surface ChemistryAfter studying the NCERT Exemplar for Class 12 Chemistry Chapter 5 PDF, you will be able to understand the topics completely from the exam point of view. You can also access the Surface Chemistry Class 12 NCERT Notes, which come in handy during the examination.
This solution has MCQs, match the following, fill in the blanks, true or false and numerical problems questions which are very important for the preparation of JEE, state board entrance exams, NEET, AIPMT, etc. To help students prepare for the exams well, we have provided the NCERT Exemplar Class 12 Chapter 5 Surface Chemistry.