Question

30. Give reason to justify the following
(a) A balloon when kept in sun stare some
(6) Water at room temperature is a lie.
(c) An iron almirah is a solid at room tempere​

Answer 1

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a) When the balloon is kept in the sun, due to Sun's heat, the kinetic energy of gaseous particles inside the balloons also gets increased and the balloon expands. This will increase the pressure on the walls of the balloon

b) Water at room temperature is liquid due to the presence of hydrogen bond. These bonds hold water molecules together for small fractions of a second. Water molecules move continuously. In gaseous matter there is random movement. Because of the hydrogen bonds, the water molecules come together they stick to one another for a small, but significant amount of time. This reduces the motion of them and holds them closer to one another. This property makes the water liquid at room temperature.

c) An iron almirah is a solid at room temperature because its melting point as well as boiling point is above room temperature. Similarly, (i) An iron almirah is rigid and has a fixed shape. (ii) The density of metal is quite high. Hence, iron almirah is a solid at room temperature.

Answer 2

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a) When the balloon is kept in the sun, due to Sun's heat, the kinetic energy of gaseous particles inside the balloons also gets increased and the balloon expands. This will increase the pressure on the walls of the balloon

b) Water at room temperature is liquid due to the presence of hydrogen bond. These bonds hold water molecules together for small fractions of a second. Water molecules move continuously. In gaseous matter there is random movement. Because of the hydrogen bonds, the water molecules come together they stick to one another for a small, but significant amount of time. This reduces the motion of them and holds them closer to one another. This property makes the water liquid at room temperature.

c) An iron almirah is a solid at room temperature because its melting point as well as boiling point is above room temperature. Similarly, (i) An iron almirah is rigid and has a fixed shape. (ii) The density of metal is quite high. Hence, iron almirah is a solid at room temperature.

$\bold{\boxed{\color{red}{\bf{\underline{Hope it's helpful to you}}}}}$