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Sodium base greases can be utilized up to the temperature of ____________

(a) 175^oC

(b) 100^oC

(c) 75^oC

(d) 80^oC

I had been asked this question in an online interview.

I would like to ask this question from Classification of Lubricants topic in chapter Lubricants of Applied Chemistry

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Correct choice is (a) 175^oC

For explanation: Sodium soaps are soluble in water and they are not water resistant. As they are not stabilized with water. They can resist up to a temperature of 175^oC. They can be used at ball and roller bearing at which there will be heat production due to heat.

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