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Dharini Manimaran from BVM Global @ Bollineni Hillside, Chennai
Subject :NSO    Class : Class 7

Kanav took two test tubes marked as I and II. In test tube I, he put calcium carbonate and hydrochloric acid while in test tube II, he put zinc granules and hydrochloric acid. He passed the gas coming out from both the test tubes in lime water. What would be his observation?


A The gas coming out from test tube I turned lime water milky.
B The gas coming out from test tube II turned lime water milky.
C The gases coming out from both the test tubes turned lime water milky.
D None of these.


it could have been simpler

Ans 1:

Dhruvan G from Indian School Al Ghubra, Muscat
Class : Class 8
If it could have been simpler, then you don't have to study for these Olympiads as its too difficult. And I don't think it is very difficult and the option is (A) i think.

Ans 2:

Pari Shiddam from PIS Powai, MUMBAI
Class : Class 8
they should have said correct statements. So the answer should be A

Ans 3:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
A is the answer

Ans 4:

ARIJIT SINGH from SAT PAUL MITTAL SCHOOL , Ludhiana
Class : Class 7

Ans 5:

ansh rai from delhi public school, Bhilai
Class : Class 4
Answer should be A as zinc granules don’t react and produce co2 gas so it’s simple and answer should be A

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