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1311. The noble gases do not react with any other atom because :
A. they are heavy elements
B. they are stable compounds
C. their outermost orbits contain eight electrons
D. of none of the above
Explanation:
1312. A convex mirror makes a good rear-view mirror for a car because :
A. it does not form diminished images
B. it has no focal point
C. its images can be thrown on a screen
D. it forms erect, reduced images
Explanation:
1313. A mixture of water and alcohol can be separated by
A. filtration
B. evaporation
C. distillation
D. decantation
Explanation:
1314. Who is the recepient of Nobal Prize for the development of Wireless Telegraphy ?
A. J. J. Thomson
B. Kamerling Onnes
C. Samuel Morse
D. Marconi
Explanation:
1315. Which of the following statements are correct ? 1. Teflon and dacron and polymers2. Neoprene is synthetic rubber3. Polythene is polyethylene polymer4. Natural rubber is chloroprene
A. 1, 2 and 3
B. 1, 2 and 4
C. 2, 3 and 4
D. 1, 3 and 4
Explanation:
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