acidsandalkalis neutralizati一問

1.)
When a few drops of methyl orange is added to limewater, what will be the colour of the solution?
ARed CColourless
BYellow DBlue
2.)
When a few drops of methyl orange is added to vinegar, what will be the colour of the solution?
ARed CColourless
BYellowDBlue
3.)
When a few drops of phenolphthalein is added to a bottle of glass cleaner, what will be the colour of the solution?
ARed CColourless
BYellowDBlue
4.)
When a few drops of phenolphthalein is added to dilute nitric acid, what will be the colour of the solution?
ARed CColourless
BYellowDBlue
5.)
Which of the following substances can tell whether a solution is acidic or alkaline?
(1)Methyl orange
(2)Phenolphthalein
(3)Litmus solution
A(1) and (2) only C(2) and (3) only
B(1) and (3) only D(1), (2) and (3)
6.)
Which of the following combinations are correct?
Indicator Colour in acidic solution Colour in alkaline solution
(1)LitmusRedBlue
(2)PhenolphthaleinRedColourless
(3)Methyl orangeRedYellow
A(1) and (2) only C(2) and (3) only
B(1) and (3) only D(1), (2) and (3)
7.)
Which of the following substances has the greatest pH value?
ALemon juice CVinegar
BSoft drink DDistilled water
Which of the following substances has the lowest pH value?
AGrape juice CWindow cleaner
BMilkDSoap

2010-02-21 11:45:32 補充：
原來有時是看不到顏色標示的....
1B 2A 3A 4C 5D 6B 7D

5.)
Actually, only (3) is correct. Methyl orange changes colour in slightly acidic solutions, while phenolphthalein in slightly alkaline solution.

7.) 2
The answer is A.
Grape juice is acidic, window cleaner is alkaline, milk is slightly acid (fresh milk: pH 6.7), and soap is slightly alkaline.