CBSE 12th Standard Chemistry Subject Value Based Questions 3 Mark Questions With Solution 2021
By QB365
QB365 Provides the Value Based Questions Papers for Class 12 Chemistry, and also provide the detail solution for each and every Value Based Questions. Value Based Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams
QB365 - Question Bank Software
CBSE 12th Standard Chemistry Subject Value Based Questions 3 Mark Questions With Solution 2021
12th Standard CBSE
-
Reg.No. :
Chemistry
-
Jagan went to Srinagar with his friend. He noticed that the taxi drivers always add ethylene glycol as a coolant in the radiator of the taxi and not water. He asked his driver, how much ethylene glycol he generally adds to the radiator. The taxi driver told him that he generally adds 30% ethylene glycol solution. On that day, the temperature of the valley was \(-10°C\) .
Answer the following questions:
(i) What is the role ethylene glycol when added to water?
(ii) Is the amount of ethylene glycol sufficient to avoid the freezing of water in car radiator when the temperature of the valley was \(-10°C\) ?(a) -
Rekha observed that her mother placed shrinked or dried vegetables in water before cutting these for cooking. After sometime, these vegetables looked fresh.
Answer the following questions:
(i) Why did Rekha's mother place the shrinked or dried vegetables in water?
(ii) What is the name of the process used and define it.
(iii) Would the temperature increase accelerate the process or not?(a) -
Manoj went with his father to buy hinges for the door. The shopkeeper showed two types of hinges: normal iron hinges and the galvanized hinges. The normal hinges were costlier. Manoj's father opted for the cheaper normal iron hinges. Manoj suggested his father to buy galvanized hinges through these were costlier.
(a) what are the rationale for Manoj to buy galvanized hinges?
(b) What values are attached with this decision?(a) -
Sulphuric acid is manufactured by Contact process.During the process,the following reaction takes place:
\({ 2SO }_{ 2 }(g)+O_{ 2 }(g)\rightleftharpoons 2SO_{ 3 }(g)\)
This reaction is favoured by high pressure, However,the pressure is not increase beyond 3 bar.As a students of chemistry how will you justify this?(a) -
D.D.T is one of the most powerful insecticides which is effective against the mosquitoes that spread malaria. Mukesh's mother wanted to buy D.D.T from the market to use at night to protect her family from mosquitoes. But Mukesh stopped his mother from purchasing D.D.T.
(a) How did Mukesh convince her mother for not using D.D.T at night?
(b) What values are attached to suggestion of Mukesh?(a)