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531. What is added to industrial ethanol to make it unsuitable for human consumption ?
A. Methane
B. Benzene
C. Methanol
D. Chlorine
Explanation:
532. If there were no atmosphere, what would be the colour of sky ?
A. Red
B. Blue
C. White
D. Black
Explanation:
533. Given below are two statements, labelled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : Red phosphorus is preferred to white phosphorus in the manufacture of matchesReason (R) : Red phosphorus is non - poisonous in nature.
A. Both A and R are true and 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:
534. Birth control polls contain synthetic
A. sugars
B. minerals
C. vitamins
D. hormones
Explanation:
535. Old - written material, which cannot be read easily, can be read by
A. cosmic rays
B. ultraviolet rays
C. infra red rays
D. None of these
Explanation:
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