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391. Which of the following is a chemical change ?
A. Magnetisation of iron
B. Melting of ice
C. Burning of sulphur
D. Melting of qax
Explanation:
392. Given below are two statements, labeled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ? 1. Assertion (A) : Oil froth floatation method is used in the extraction of metal from its ore. 2. Reason (R) : It is used mainly for sulphide ores where ore settles down.
A. Both A and R are true but R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
393. Which of the following substances is a polymer of isoprene ?
A. Bakelite
B. Natural rubber
C. Thiokol
D. Melamine
Explanation:
394. Given below are two statements, labeled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : Soap removes oil and dirt.Reason (R) : Soap increases the surface tension of water.
A. Both A and R are true but R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
395. Given below are two statements, labeled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : Plaster of Paris is used by doctors for setting fractured bones.Reason (R) : When Plaster of Paris is mixed with water and applied around the fractured limbs, it sets into a hard mass.
A. Both A and R are true but R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
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