Q.17 Assertion-Sodium and Potassium is stored in kerosene. Reason- To avoid contact with oxygen and moisture so that they do not combust explosively.
Q.18 Assertion- In order to preserve some food items salt is added.
Reason-It adds water content, thereby making microbes inactive.
Q.19 Assertion-Conductivity of a liquid can be increased
Reason-By adding sugar, honey or vegetable oil
Q.20 Assertion-Sound travel fastest in gases
Reason-As particles are away from each other
Q.18 Assertion- In order to preserve some food items salt is added.
Reason-It adds water content, thereby making microbes inactive.
Q.19 Assertion-Conductivity of a liquid can be increased
Reason-By adding sugar, honey or vegetable oil
Q.20 Assertion-Sound travel fastest in gases
Reason-As particles are away from each other
Add an Answer
More Questions From This User See All
Answers & Comments
Answer:
Sodium and potassium are highly reactive metals that react violently with oxygen, carbon dioxide, and moisture in the air, potentially causing a fire. Because Sodium does not react with kerosene, it is constantly immersed in it to prevent this explosive reaction
Answer:
Ans-17- Both A and R are true and R is the correct explanation of A
Ans-18- A and R both are false
Ans-19- A is true but R is false
Ans-20- A is false but R is true