Question

Give two reasons to justify— (a) water at room temperature is a liquid. (b) an iron almirah is a solid at room temperature.NCERT Class 9th Science Ch 1 Matter in Our Surroundings

Answer 1

Explanation:

At room temperature water is liquid because it has the following characteristics of liquid . water had a fixed volume .

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Answer 2

Answer:

(a) Because of the existence of hydrogen bonds.

(b) At room temperature, almirah or any solid object has a distinct and hard form, as well as a fixed volume.

Explanation:

(a).

Because of the existence of hydrogen bonds, water is liquid at ambient temperature.  Water molecules are constantly moving. Due to hydrogen bonding present in water molecules, they have the tendency to stick together although for a brief period of time. This slows down their movement and brings them closer together. At room temperature, this characteristic turns water into a liquid.

b.

At room temperature (25°C), an iron almirah is solid because:

• At room temperature, almirah or any solid object has a distinct and hard form, as well as a fixed volume.
• The shape does not deform when the external force is applied.