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What is the method to control the pH of autoclave charge?

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What is the method to control the pH of autoclave charge?

(a) copper-ammonio hydroxides

(b) zinc-ammonio hydroxides

(c) Copper-ammonio

(d) Copper-Nickel hydroxides

This question was posed to me by my school principal while I was bunking the class.

Question is from Kinetics of Ammonolysis topic in chapter Amination by Ammonolysis of Unit Processes

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The correct choice is (a) copper-ammonio hydroxides

Explanation: There are two other useful methods of controlling the pH of the autoclave charge: the introduction of copper-ammonio hydroxides and the use of buffer salts, such as soap or chIorates, which are attacked and decomposed when the concentration of the hydracid is sufficiently great.

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