题目内容

The radius of a circle is increased by 5%. The percentage increase of the circumference is ()

A. 5%.
B. 10%.
C. 12%.
D. 16%.
E. 20%

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The electron configuration of element 25 is [Ar] 3d54s2, then it is in ( ) period of periodic table.

A. 2
B. 3
C. 4
D. 5

If 180 g glucose (M=180 g/mol) is dissolved in 1 kg water. The magnitude of freezing point depression of this solution is ( ). (Kf=1.86 K•kg•mol-1)

A. 0.512 K
B. 1.86 K
C. 1.024K
D. 3.72K

What mass of NaCl is contained in 500 mL of a 0.200 mol/L NaCl solution?

A. 11.7 g
B. 5.85 g
C. 75 g
D. 58.5 g

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A. 1s
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C. 4f
D. 2d