Page 3 - HOME ASSIGNMENT-2(PRACTICAL WORK SHEET)

4. Four students were asked to test the pH of four samples as shown under. Whose
result is reported correctly?
Ethanoic
Student Water HCl NaOH
acid

a 7 1 1 1

b 7 3 1 1

c 7 1 1 13

d 7 3 1 13

5. A person X tested the pH of his saliva immediately after drinking coffee. The pH
range he got is:
a. 2.0-3.0 b. 13.0-14.0 c. 8.0-9.0 d. 6.0-7.0
6. A student was given four unknown colourless samples labelled A, B, C and D. He
was asked to test their pH with pH paper. He observed the following colour changes
A – light green B – dark red C – light orange D – dark blue
The correct sequence of increasing order of pH of sample is:
a. A < B < C < D
b. A<D<C<B
c. C < B < A < D
d. B < C < A < D.
7. The two colours seen on the extreme ends of the pH chart are:
a.red and blue
b. red and green
c. green and blue
d. orange and green.
8. The colours obtained on a pH paper for a highly acidic, basic and neutral solutions
respectively are
a. blue, orange, green
b. yellow, blue, green
c. red, blue, green
d. red. green, blue.

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