题目内容

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

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

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What is the conjugate acid of HCO3-? ( )

A. CO32-
B. H2CO3
CO2
D. H2O

If the equilibrium constant Kbof C6H5COO–in water is 1.5×10-10, the equilibrium constant Kaof C6H5COOH is ( ).

A. 1.0×10-3
B. 5.0×10-11
C. 6.7×10-5
D. 1.5×10-10

Which of the following substance belong to amphoteric species ( )?

A. HAc
B. NH4Cl
C. NaHS
D. Na2CO3

The conjugate base has one fewer H and one more ( ) charge than the acid.

A. negative
B. positive
C. neutral
D. zero