Explanation

The atomic number was discovered by Henry Moseley in 1910.

Henry Moseley was an English physicist.

Explanation

Eratosthenes, the ancient Greek scholar is called the 'father of geography'.

He was the first one to use the word geography.

He also had a small-scale notion of the planet that helped him to determine the circumference of the earth.

Explanation

On 21 July 1921, a young surgeon named Frederick Banting and his assistant Charles Best

On 11 January 1922, insulin was first used in the treatment of diabetes

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Explanation

• Carbon dioxide (CO2) is a major greenhouse gas.
• It responsible for about 65% of the Earth's greenhouse effect.

Explanation

Galvanized iron sheets have a coating of zinc. 

Galvanization is a process where a layer of zinc is applied to iron or steel to protect it from rusting, making "galvanized iron" essentially iron coated with zinc

Explanation

Nichrome, an alloy of nickel and chromium.

It is used because of its high resistance and ability to withstand high temperatures without oxidizing.

Explanation

Snails are mollusks, belonging to the phylum Mollusca.

They typically have a soft body and, in many cases, an external shell.

Explanation

Explanation

The potential of pure water is zero.

Standard Electrochemical Potential:

The standard electrode potential of pure water is considered zero because it is the reference point against which other electrode potentials are measured.

Chemical Potential:

In thermodynamics, the chemical potential of pure water in its standard state (typically at 1 atm pressure and 25°C) is taken as a reference and thus has a relative value of zero.

Explanation

• Ozone gas is a molecule made up of three oxygen atoms, with the chemical formula O3.
• This is different from ordinary oxygen, which has the chemical formula O2.