Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?

The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.

Industrial workers working in leather tanning & manufacturing units are prone to suffer from

Which of the following is not a natural source of air pollution?

Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to

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