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Ritesh N Das from Adamas International School, Kolkata
Subject :NSO    Class : Class 6
What is the formula of chalk????

Ans 1:

abhinav from fitjee world school, Hyderabad
Class : Class 8
caco3

Ans 2:

Krish Sharma from Delhi Public School, New Delhi
Class : Class 6
the answer is - calcium carbonate

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