Question

1. What causes nose bleeding at higher altitudes ?

2. Reaction of metals with Dilute acid ? ​

Answer 1

$\huge \red{answer}1$

When the atmospheric pressure is low, the high pressure exerted by blood can cause blood vessels to burst, hence causing bleeding. Nose bleeding is one such example .

$\huge \purple{answer}2$

Magnesium+ hydrochloric acid -> magnesium chloride + hydrogen .