题目内容

Air within a container is ( )

A. heterogeneous mixture
B. homogeneous mixture
C. an element
D. a compound

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How many significant figures are there in 0.004010? ( )

A. 6
B. 3
C. 7
D. 4

The solubility of NaCl is 35.7 g/100 mL of water at 0 oC, and 39.12 g/100 mL of water at 100oC. A sample of 75 g NaCl was stirred overnight at 100oC with 200 mL water. Which statement is correct? ( )

A. The solution is unsaturated
B. The solution is saturated
C. The solution is supersaturate
D. It is hard to know from the conditions given

For a ClF4+ ion, how many valence electrons should be shown in the Lewis structure? ( )

A. 32
B. 33
C. 34
D. 35

The oxidation number of S in NaHSO3 is ( )

A. -2
B. 0
C. +4
D. +6