Metals placed below the hydrogen in reactivity series, will not give H₂(g) with water (H₂O). Decreasing order of reactivity of metals is Na > Mg > Zn > Cu

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As you know that the thickness of atmosphere is low, at very high altitude. So, there are less number of particles present for scattering. Therefore, the sky appears dark to the passengers.

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For an object moving along a straight path in an accelerated motion, it is not necessary that it always goes away from the earth.