Explanation:

Answer

1) When we bring a burning match stick near the mouth of a test tube containing aluminium foil reacting with sodium hydroxide, a pop up sound is created in this solution and this indicates the presence of hydrogen gas formed when the aluminium foil reacts with sodium hydroxide inside the test tube. Hence, can be known its presence when the burning match stick is brought near the test tube.

2) Bitumen is constituent of petroleum which is obtained as a residue from the distillation of crude oil is the alternate material to coal tar. That is now used for surfacing roads.

3) Two reasons of deforestation:-

● Cutting of excessive trees for our needs and instead of planting in place of the missing ones leads to deforestation.

● Soil Erosion also causes deforestation. When the soil gets loosen due to heavy amount of water may be because of rainfall or some other purpose of water, the roots of trees to bind this soil becomes weak to hold and finally falls down. This is also a type of deforestation.

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