题目内容

Which salt gives an acidic solution when dissolved in water ( )

A. Ba(NO3)2
B. NaNO2
C. KBr
D. NH4I

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Determine the molecular geometry of XeF4. ( )

A. tetrahedral
B. trigonal bipyramidal
C. T-shaped
D. seesaw

If the plot of the reactant concentration versus time is nonlinear, but the concentration drops by 50% every 10 seconds, then the order of the reaction is ( )

A. zero order
B. first order
C. second order
D. third order

If the plot of the reactant concentration versus time is linear, then the order of the reaction is ( )

A. zero order
B. first order
C. second order
D. third order

Find the pH of 0.175 M NaCN solution. For HCN, Ka = 4.9 × 10-10. ( )

A. 5.03
B. 11.28
C. 2.31
D. 8.97