CBSE Class 12 VBQs for chemistry Set D

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CBSE Class 12 VBQs for chemistry Set D CBSE,CCE and NCERT students can refer to the attached fileValue based questions are now being given in exams to promote morals and values in students, Students should read and understand the following VBQs to get better understanding and score good marks in exams




Scuba divers when come towards the surface, the pressure gradually decreases resulting in the released of dissolved gases leading to formation of bubbles of nitrogen gas in the blood which blocks the capillaries and thus harmful kinds are created. To avoid bends and toxic effects of high concn of nitrogen gas, the air is diluted with helium.

After reading the above passage, answer the following questions.

i) Why is the harmful condition of bends overcome by the use of helium. ii) Which law is used to calculate the concentration of gases in solution.

iii) Mention the value associated with providing divers air diluted with helium.

(2) Ram takes a open pan to cook vegetables at a hill station while shyam cook the same vegetables in a pressure cooker at the same place.

(a) Explain with reason who will cook vegetable faster.

(b) Mention the reason for the delay in cooking.

(c) Which value is learnt by the student in the process of cooking food in the pressure cooker.



a) Name the process observed when pressure on solution side is more than osmotic pressure.

(b) Write main use of this process.

(c) Mention the values associated with the above process.

(4) Reena planted neem tree in school premises and Meena planted Neem tree in marshy land near railway line.

(a) Which student planted Neem tree correctly and why?

(b) Name the chemical substances used to stop decay of such plants.

(c) Mention the values by the plantation. 

Please refer to the link below for CBSE Class 12 VBQs for chemistry Set D


Click on the text For more study material for Chemistry please click here - Chemistry

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