A protective coating of nickel is given over other metals. *
b. Mercury is used in thermometers. *
c. A candle stops burning when covered by a beaker but continues to burn when the beaker is raised even slightly. *
d. Why chlorine is used as disinfectant. *
pls answer all question in short
Answers
Answer:
a ) Nickel is also responsible for numerous properties associated with the coating, such as hardness and resistance to corrosion. Originally, chromium was used simply to protect and coat nickel, but it also increases the coating's overall corrosion resistance, thereby providing increased protection to the substrate.
b)Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures.
d) Chlorine kills pathogens such as bacteria and viruses by breaking the chemical bonds in their molecules. Disinfectants that are used for this purpose consist of chlorine compounds which can exchange atoms with other compounds, such as enzymes in bacteria and other cells. ... This results in disinfection
from wikipedia