CBSE Class 12 Chemistry Electrochemistry VBQs

CBSE Class 12 Chemistry Electrochemistry 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 3 Electrochemistry

Class 12 Chemistry students should refer to the following value based questions with answers for Unit 3 Electrochemistry in Class 12. These VBQ questions with answers for Class 12 Chemistry will come in exams and help you to score good marks

Unit 3 Electrochemistry VBQ Questions Class 12 Chemistry with Answers

Chapter-3:

ELECTROCHEMISTRY


Question. Kailash goes to the market to purchase battery for his car. Two types of batteries are shown to him, one with cadmium plates which is relatively more costlier while the other one with lead plates which is cheaper. The shopkeeper advises him to go for cadmium plate battery instead of lead plate battery.
Answer the following questions:
(i) As a chemistry student, do you agree with shopkeeper’s advise?
(ii) Give two reasons to support his advise.
(iii) What are the values associated with his advise?
Answer:
(i) Yes, shopkeeper is right to advise him to purchase cadmium plate battery.
(ii) It is wise to choose sustained long-term benefit than short-term gain with regards to health/money. Lead produces harmful effects on human beings and environment.
(iii) Knowledge is useful only when put into practice. Knowledge of harmful effects of lead make us aware of less usage of lead batteries and also unleaded petrol to keep ourselves and our environment healthy.

Question. During the construction of some public building, the contractor intends to fix iron frames for windows and railings to reduce the cost of construction. After due considerations, it is finally recommended to use aluminium frames for windows and steel railings instead of iron.
Answer the following questions:
(i) As a chemist, do you agree with the new recommendations.
(ii) Give two reasons for your choice.
(iii) What values are associated with the decision?
Answer:
(i) Yes, the new recommendations are more appropriate in the light of long-term benefit.
(ii) Iron grills and railings are more prone to corrosion which causes damage to the construction gradually. Aluminium and steel are relatively safer in this respect.
(iii) Knowledge of corrosion/rusting of iron and its prevention makes us aware of its proper application in construction work so as to avoid damage and accidents.

Question. In earlier days food items and products like cooking oil, sugar and biscuits were packed in tin containers. These containers were then used by housewives for storing grains and other kitchen items. Now exports /imports in tin containers are strictly prohibited; in spite of this we still seem to permit the tin containers for soft drinks.
a) What do you think is the reason for the prohibition?
b) Should we continue to use soft drink cans?
c) What values do we lack based on this information? 
Answer:
(a) Tin is a metal that can easily corrode when exposed to atmosphere. This can spoil the food item stored in it.
(b) No, because soft drinks are highly acidic and std reduction potential of tin is lesser than hydrogen and hence it can react with acidic component of the drink.
(c) Lack of awareness about harmful effects of harmful metals on our health, getting highly influenced by advertisements.

Question. Two iron plates, with dents were allotted to two students for plating and study of prevention of rusting. The first student selected tin for coating his plate, while the second chose zinc for the same purpose.
a) Who do you think made the right choice, and why?
b) Mention one value associated with the study of corrosion.
Answer:
(a) The student who chose zinc, made the right choice. Zinc is more reactive than iron and hence its coating can prevent corrosion of iron.
(b) Ability to apply gained knowledge in day to day activities.

Question. Raju and his father were going in a boat in the river. Raju’s father threw away the cell used in watches and hearing aids into the water. Raju prevented him from doing so.
a. As a student of chemistry, why would you advise Raju’s father not to throw the cell in the water body.
b. What is the value associated with the above decision?
Answer:
a. The cells used in watches are mercury cells. The mercury can pollute water. Water contaminated with mercury leads to accumulation of mercury in the body of the fishes and other aquatic life.
b. Keeping the environment safe from pollution due to mercury.

Question. The water pipe line of a house has started rusting. The lady of the house does not want excavation of the pipelines. As a student of chemistry what would you suggest her to do so that further rusting can be prevented? What values are shown by you in this gesture?
Answer: 
Magnesium block should be attached to water pipeline through an electric wire. It will act as anode and undergo oxidation in preference to iron (Cathodic protection) Values: Helping mentality shown towards needy people, application of learnt knowledge in day to day activities, ability to make complicated work simple.

Please refer to the link below for CBSE Class 12 Chemistry - Electrochemistry 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 3 Electrochemistry VBQs

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CBSE VBQs Chemistry Class 12 Unit 3 Electrochemistry

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