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The water bath is provided with stirrer having ________ blades.

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The water bath is provided with stirrer having ________ blades.

(a) One

(b) Two

(c) Three

(d) Four

I have been asked this question in an international level competition.

Question is taken from Viscosity and Viscosity Index in portion Lubricants of Applied Chemistry

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The correct option is (d) Four

For explanation: The water bath is provided with a stirrer having four blades. It is provided with four blades because it helps to maintain the uniform temperature in bath to facilitate the uniform heating of the oil.

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