Correct answer
D. 350 to 450
Explanation
The correct answer is 350 to 450.
Which of the following is not a commercially used feed-stock for the production of ammonia synthesis gas?
Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
Which of the following impurities in feed water for high pressure boiler is the most detrimental?
(Le/D) for couplings and unions would be________?
The reverse process of fractional crystallisation is called________?
A mixture of chlorine & sodium bromide acts as a/an________?