Which is a chemical property of hydrogen?
a) it is a light gas.
b) it is a combustible gas.
c) it is a colorless gas.
d) it has a boiling point of -252.87°c.
e) it is a good conductor of electricity.

The correct answer is option B) It is a combustible gas.

Explanation:

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The chemical properties affect the structures of the molecules and the physical properties do not affect it.

Among the physical properties of hydrogen, we find that it is a colorless gas, the boiling point and that it is a light gas.

Among the chemical properties proposed here, the option is that it is a combustible gas. Since after combustion the gas lost its original structure.

Then, we will conclude that the correct answer is option B) It is a combustible gas.

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.