Question 7 of 25 URGENT! PLEASE ANSWER

Which of these changes
produces a chemical change?
A. A large rock is crushed into gravel.
B. Lava cools and changes from a thick fluid to solid rock.
C. A stone fizzes and forms a gas when acid is dropped on it.
D. Limestone slowly dissolves in water and forms a cave.

Answer is C.

Step-by-step explanation:

it changes the CHEMICAL composition of it

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

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step-by-step explanation:

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