We call it a "green" leaf because green light bounces off of it and enters our eyes. Other colors of light are absorbed by the leaf and stop right there.
If there's no green light to bounce off of the leaf, then no light at all comes from it.
When we look at an object that has no light coming from it, we describe the object as "black". We only know it's there because of its background and surroundings.
(Choice - A)
Answer:
is a double displacement reaction
- is a redox reaction
- is a combination reaction
- is a decomposition reaction
Explanation:
It is of the form
Both oxidation and reduction occur in this reaction. Fe gets oxidized and H gets reduced.
It is an exothermic combination reaction. Calcium reacts with water to produce calcium hydroxide and heat is released in this process.
It is a decomposition reaction where nickel chloride decomposes to nickel and chlorine.
Components are the names of the horizontal and vertical parts of a vector.
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