1. what made mustard gas so effective?
it was effective in stopping air attacks
it didn't need to be inhaled to be effective
it was colorless
it caused instant death in most cases

2. why did people inside of tanks often pass out?
they had very little training
it was so fast
they were terrified
it was very hot and there was nothing separating them from the engine and its fumes

1.  It didn't need to be inhaled to be effective

2.  It was very hot and there was nothing separating them from the engine and its fumes

Explanation:

mustard gas is a chemical agen that caused severe burning of the skin, eyes, and respiratory tract; can be absorbed through inhalation, ingestion, or coming into contact with skin/eyes.

a.   it resulted in widespread unemployment.

in the 1800s, chinese workers migrated to the united states, first to work in the gold mines, but also to take agricultural jobs, and factory work, especially in the garment industry. chinese immigrants were particularly instrumental in building railroads in the american west, and as chinese laborers grew successful in the united states, a number of them became entrepreneurs in their own right. as the numbers of chinese laborers increased, so did the strength of anti-chinese sentiment among other workers in the american economy. this finally resulted in legislation that aimed to limit future immigration of chinese workers to the united states, and threatened to sour diplomatic relations between the united states and china.