Question

Two gases NH3 and HCL are introduced at the two ends of a 100m long tube simultaneously. If tube us of uniform cross-section. At what distance from NH3 gas end white fumes will be seen​

Answer 1

Can you imagine a world without merchants, where we are left to our own devices to acquire goods and services without middlemen? Sounds like a harsh place to be. The sale and trade of goods defines much of the development and history of the world.