Consider the following pairs :

I. Pigment : TiO2

II. Drier : Turpentine

III. Thinner : Naphthenates

IV. Antiskinning agent : Polyhydroxy phenol

How many of the pairs given above are correctly matched?

In the chemistry of paints, the components serve the following functions:

• Pair I: Titanium Dioxide (TiO2) is the most widely used white pigment due to its high refractive index and opacity. This is correctly matched.
• Pair II: Turpentine is a thinner (solvent) used to reduce viscosity, not a drier. This is incorrectly matched.
• Pair III: Naphthenates (of cobalt, manganese, etc.) are metallic salts used as driers to accelerate the drying of the oil film. This is incorrectly matched.
• Pair IV: Polyhydroxy phenols (like hydroquinone) are used as antiskinning agents to prevent the formation of a skin on the paint surface in the container by inhibiting premature oxidation. This is correctly matched.

Thus, only two pairs (I and IV) are correctly matched.