Question

class - 9

Q. Give both two reasons to justify:

(a) Hydrogen at room temperature is a gas.

(b) a brass statue is a solid at room temperature.​

Answer 1

Answer:

(a) It is so because, the molecules of HCI are bonded to one another by weak hydrogen bonding. Because of the weak hydrogen bonding the molecules are not close enough to maintain the liquid state of matter.

Hence, they are gas at room temperature.

(b) A brass statue is a solid at room temperature because it has a definite shape and definite volume.

Explanation:

Hope It's Helpful!

Answer 2

Reasons of the statements:

• Hydrogen is gas at room temperature. It is so because of the reason that, the molecules of HCl are attached to one another by weak hydrogen bonding. As there is weak hydrogen bonding the molecules are not close sufficient to maintain the liquid state of matter. Therefore, they are gas at room temperature.
• Brass is solid at room temperature because of its definite volume and shape.