Consider the following properties: i) the red color of rubies is due to the presence of chromium ions. ii) objects made of silver become tarnished. iii) the boiling point of ethanol is 78◦c. which is/are chemical?
(a) ii only
(b) ii and iii only
(c) i only
(d) i and ii only
(e) iii only
(f) i, ii and iii
(g) none of these
(h) i and iii only

Only II) is correct

Explanation:

I) The red color of the rubies is a physical property of its own structure (wich contains  chromium ions)

II)Objects made of silver become tarnished not by a physical property, but as the result of a chemical reaction on the surface of the object made of silver in combination with the sulfur in the air

This changes the color of the object to black, (similar to the iron oxidation)

iii)Boiling is a physical change where a liquid substance absorbs heat in some way (e.g. a flame) and becomes a gas

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