Which of the following molecules has three- fold axis of symmetry
a. NH 3
b. C 2 H 4
c. C O 2
d. SO 2
Ans. a
Explanation : In NH molecule the original appearance is repeated as a result of rotation through 120° Such a axis is said to be axis of three- fold symmetry or a triad axis
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dm-3 sucrose solution at 20 ° C (molar gas constant, R = 8.314 JK -1 mol -1 ; 1 dm-3 = 0.001 m3 ) a. 4870 Pa b. 4.87 Pa c. 0.00487 Pa d. 0.33 Pa Ans. a (17)
