Which of these pairs of aqueous ions both react with dilute sulfuric acid to give a visible result?
A Ba? and CI
B Ba?' and Co,
CNH. and C1
D NH, and Co?
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Ответ:
Cost of silk was too high
Explanation:
The major reason of not using silk as a fabric in the hot air balloons was high cost of silk. Due to its high cost, silk became unaffordable for use in modern balloon.
If cost is neglected, then silk is the perfect material for hot air balloon as it is light in weight