Explanation

• Gases are the state of matter that takes both the shape and volume of a container they are placed in. They expand to fill the container and conform to its shape.
• Liquids, take the shape of a container but maintain their own volume.
• Solids maintain both their shape and volume, regardless of the container they are placed in.

Explanation

• The existence of impurities in water decreases its freezing point, a phenomenon known as freezing point depression.
• This is because the impurities disrupt the formation of ice crystals, making it more difficult for water to freeze.
• As a result, the freezing point of water is lowered.

Explanation

• Nylon is a synthetic polymer that belongs to the class of polyamides.
• It is made up of repeating units of amide groups (-CONH-) linked together by peptide bonds.
• Nylon is a thermoplastic material that is strong, flexible, and resistant to abrasion and chemicals.

Explanation

The Rydberg constant (R) is a physical constant used in atomic spectroscopy.

Its approximate value is 1.097×10^5 m-1  

Explanation

At 98% saturation, hemoglobin carries about 19.6 ml O₂ per 100 ml of blood.

Explanation

 The answer is All of the above.

The oxidation number of an element can be zero, negative, or positive, depending on the element and its bonding environment. 

Explanation

NO₂ (Nitrogen dioxide) is a covalent compound, made of nonmetals (nitrogen and oxygen) sharing electrons.

The others like (NH₄)₂CO₃, HNO₃, and AgCl involve ionic bonding either fully or in part (e.g., NH₄⁺ acts ionically).

Explanation

Oxidation of a secondary alcohol results in the formation of a ketone.

Explanation

In Bohr's model, electrons occupy specific energy levels around the nucleus.

When an electron moves from a lower energy level to a higher energy level, it absorbs energy

Conversely, when an electron moves from a higher energy level to a lower energy level, it emits energy.

This energy is emitted as a photon of light with a specific wavelength, corresponding to a specific frequency. 

Explanation

The Cannizzaro reaction is a disproportionation reaction where a non-enolizable aldehyde undergoes simultaneous oxidation and reduction.

One molecule of aldehyde is oxidized to a carboxylic acid, and another is reduced to an alcohol.