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Subject :NSO    Class : Class 8

Pranav, a class VII student collected some China rose petals and placed in a beaker. To this he added some warm water, kept it for some time and then he used this coloured water as an indicator. He collected few samples and tested them with China rose indicator. Which of his observations was/were not correct?
      Sample                     Effect on adding China rose indicator
(i) Soap solution                Turns green
(ii) Curd                             No change
(iii) Soft drink                    Turns dark pink
(iv) Antacid tablet              Turns green

A(i) and (ii)
B(ii) only
C(ii), (iii) and (iv)
D(i) and (iii)


this question's answer according to the sofolympiad trainer website is option C. the answer given by the website is wrong, isn't it?

Ans 1:

Class : Class 10
Any link with Lopamudra Raut? :-)

Ans 2:

Class : Class 9
it should be B as antacids are basic, and they will turn china rose to green

Ans 3:

Class : Class 8
I think the answer which they told is wrong. The ans should be B.

Ans 4:

Class : Class 7
Answer should be b

Ans 5:

Class : Class 8
B is correct antacids are basic since they are made for curing stomah acidity so it will turn the indicator to green.

Ans 6:

Class : Class 8
It should be b

Ans 7:

Class : Class 5
yes answer should be B

Ans 8:

Class : Class 8
The correct option is B.Because curd is acidic and the indicator should have changed to dark pink color.

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