CBSE Class 12 Chemistry Surface Chemistry VBQs

CBSE Class 12 Chemistry Surface Chemistry VBQs read and download in pdf. Value Based Questions come in exams for Chemistry in Class 12 and are easy to learn and helpful in scoring good marks. You can refer to more chapter wise VBQs for Class 12 Chemistry and also get latest topic wise very useful study material as per latest NCERT book for Class 12 Chemistry and all other subjects for free on Studiestoday designed as per latest Class 12 CBSE, NCERT and KVS syllabus and examination pattern

VBQ for Class 12 Chemistry Unit 5 Surface Chemistry

Class 12 Chemistry students should refer to the following value based questions with answers for Unit 5 Surface Chemistry in Class 12. These VBQ questions with answers for Class 12 Chemistry will come in exams and help you to score good marks

Unit 5 Surface Chemistry VBQ Questions Class 12 Chemistry with Answers

Chapter-5:SURFACE CHEMISTRY

 

Question. Which gas will be adsorbed on a solid to greater extent.
(A) A gas having non polar molecule
(B) A gas having highest critical temperature (Tc)
(C) A gas having lowest critical temperature.
(D) A gas having highest critical pressure.
Answer : B

Question. The heat of physisorption lie in the range of
(A) 1 – 10 kJ mol–1
(B) 20 to 40 kJ mol–1
(C) 40 to 200 kJ mol–1
(D) 200 to 400 kJ mol–1
Answer : B

Question. Adsorption is the phenomenon in which a substance:
(A) accumulates on the surface of the other substance
(B) goes into the body of the other substances
(C) remains close to the other substance
(D) none of these
Answer : A

 

Question. Which of the following is a lyophobic colloid?
(A) Gelatin
(B) Sulphur
(C) Starch
(D) Gum
Answer : B

Question. In the colloidal state the particle size ranges
(A) below 1 nm
(B) between 1 nm to 100 nm
(C) more than 100 nm
(D) none of the above
Answer : B

Question. The rate of chemisorption :
(A) decreases with increase of pressure
(B) increases with increase of pressure
(C) is independent of pressure
(D) is independent of temperature
Answer : B

Question. The volume of gases NH3, CO2 and CH4 adsorbed by one gram of charcoal at 298 K are in
(A) CH4 > CO2 > NH3
(B) NH3 > CH4 > CO2
(C) NH3 > CO2 > CH4
(D) CO2 > NH3 > CH4
Answer : C

Question. Finely divided catalyst has greater surface area and has greater catalytic activity than the compact solid. If a total surface area of 6291456 cm2 is required for adsorption in a catalysed gaseous reaction, then how many splits should be made to a cube of exactly 1 cm in length to achieve required surface are.
(Given : One split of a cube gives eight cubes of same size)
(A) 60
(B) 80
(C) 20
(D) 22
Answer : C

Question. Adsorption is multilayer in case of
(A) physical adsorption
(B) chemisorption
(C) in both
(D) none of the these
Answer : A

Question. Bleeding is stopped by the application of ferric chloride. This is because:
(A) the blood starts flowing in opposite direction
(B) the blood reacts and forms a solid, which seals the blood vessel
(C) the blood is coagulated and thus the blood vessel is sealed
(D) the ferric chloride seals the blood vessel.
Answer : C

Question. There is desorption of physical adsorption when:
(A) temperature is increased
(B) temperature is decreased
(C) pressure is increased
(D) concentration is increased
Answer : A

Question. Which of the following is characteristic of chemisorption?
(A) it is irreversible
(B) it is specific
(C) it is multilayer phenomenon
(D) heat of adsorption of about – 400 kJ
Answer : A

Short Answer type Questions

Question. Kala-azar is a disease caused by mosquito (protozoa) that results in irregular fever enlargement of spleen and hemorrhages that are generally fatal.
(1) What is the treatment of Kala-azar?
(2) Is colloidal antimony, lyophilic or lyophobic colloid?
(3) Is colloidal antimony, multimolecular, macromolecular or associated colloid? 
(4) How can we prevent us from fever caused by mosquito?
Answer : (i) colloidal antimony.
(iii) it is lyophobic colloid.
(iii) it is multimolecular colloid.
(iv) we should use mosquito repellant and do not allow stagnant water in coolers, overhead tanks, etc.

Question. Surface chemistry deals with phenomenon that occurs at all the surface or interfaces. Many important phenomenon- corrosion, electrode process, heterogeneous catalysis, dissociation,adsorption,crystallisation occur at the interfaces.
(1) Why do we use charcoal, in gas marks, in coal mines?
(2) How is animal charcoal, used in the decolourisation of sugar?
(3) What is the use of silica gel which is given along with camera and other electronic equipments?
(4) There is safety lamp in coal mines. What is its purpose?
Answer :  (i) it absorbs poisnous gases to large extent and not oxygen which is used for breathing.
(ii) it absorbs the undesirable colours from aqueous solution of sugar, we get colourless sugar.
(iii) silica gel absorbs water molecules on it surface which may spoil the equipment.
(iv) whenever there is excess of carbon monoxide gas, the colour of flame becomes blue and coal mine workers are asked to come out because carbon monoxide gas may lead to death. 

Question. Hydrogenous of vegetables oil in presence of catalyst, is used to prepare vegetable ghee.
                   Vegetable oil  ———————> Vegetable ghee
It is the most important industrial process.
(1) Which catalyst is commonly used in hydrogenation process and in which state?
(2) Do you think we should use vegetable ghee instead of vegetable oils?
(3) Is use of Nickel useful or harmful for our body?
(4) Why should we avoid taking deep fried snacks?
(5) Why should excessive use of antacids be avoided?
Answer : finely divided nickel is used as catalyst in hydrogenation.
(ii) No, we should use vegetables oil instead of vegetable ghee as it is partly saturated, may lead to formation of cholesterol.
(iii) Nickel gets mixed with vegetable ghee. It is harmful for our body as it is found to be carcinogenic (cancer causing).
(iv) It is because these led to the formation of excess of acid, which leads to hyperacidity, indigestion and stomach disorders.
(v) These are basic in nature and thus can induce more secretion of hydrochloric acid in gastric juice, that is why, these should be avoided as far as possible.

Question. Most of the substances we come across in our daily life are colloids. The meals we eat, cloths we wear, the wooden furniture we use, the house we live in, the newspaper we read, our largely composed of colloids. Dust particles in air, smoke, milk and blood are also example of colloidal solution.
(1) Why is sky blue in colour?
(2) How can we stop bleeding?
(3) How are deltas formed?
(4) How should we decrease SPM (Suspended Particulate Matter) in atmosphere?
Answer : (i) dust particles along with water suspended in air, scatter blue light Reaches our eyes and the sky looks blue to us.
(ii) FeCl3 or alum coagulates blood. Blood is negatively charged Colloid which is coagulated by Fe3+ or Al3+ ions affectively.
(iii) Deltas are formed by coagulation of muddy river water coagulated By electrolytes present in sea water.
(iv) Because SPM cause respiratory problems.

Question. Colloidal solutions are used as medicines. Colloidal medicines, are more effective because they have large surface area and are therefore, easily assimilated.
(1) Name a colloidal solution used in eye lotion.
(2) What is use of colloidal gold?
(3) What is milk of magnesia? Give its uses.
Answer : (i) Argyrols (a silver sol) is used in eye lotion.
(ii) It is used for intra muscular injections to give strength to muscles.
(iii) Colloidal solution of Mg(OH)2 is called milk of magnesia. It acts as antacid. It is used for stomach disorders.

Please refer to the link below for CBSE Class 12 Chemistry - Surface Chemistry VBQs

Unit 08 The d- and f-Block Elements
CBSE Class 12 Chemistry D And F Block Elements VBQs
Unit 12 Aldehydes, Ketones and Carboxylic Acids
CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids VBQs

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CBSE Class 12 Chemistry Unit 5 Surface Chemistry VBQs

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