Explanation

In the modern periodic table, there are 7 periods (horizontal rows) and 18 groups (vertical columns).

Explanation

• When blue litmus paper is dipped in an acid, it turns red.
• This is because the acid changes the color of the litmus paper from blue to red.

Note: When red litmus paper is dipped in a base, it turns blue.

Explanation

Explanation

Explanation

Explanation

Magnesium Sulphate (Epsom salt) is a common laxative that helps relieve constipation by drawing water into the intestines.

It works by softening stool and promoting bowel movements when taken in proper dosage.

Explanation

Neutrons have no electric charge, hence they are neutral.

Protons have a positive charge.

Electrons have a negative charge.

Explanation

The atomic number was discovered by Henry Moseley in 1910.

Henry Moseley was an English physicist.

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

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.