Question

1. Alcohol mixed with water is used in car radiators . Why?

2. Why is hydrogen peroxide solution stored in dark coloured bottle?

Answer 1

Alcohol mixed with water is used in car radiators ( especially in cold countries) because alcohol has a lower freezing point (around 156 K ) than water (273 K) and so it can be used in radiators of cars even in extreme cold weather whereas water will freeze at 0℃.

Hydrogen Peroxide (H2O2) is stored in dark coloured bottles because in the presence of sunlight it decomposes to from H2 and O2.This reaction is also called Photolysis or Phote--Chemical Decomposition Reaction.

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