Question

Which statements about viscosity are true? (i) viscosity increases as temperature decreases. (ii) viscosity increases as molecular weight increases. (iii) viscosity increases as intermolecular forces increase?

Answer 1

Viscosity increase as the molecular weight increases

Answer 2

Answer : All the statements are true.

Explanation :

Viscosity : It measures the resistance of a liquid to flow is known as the viscosity.

There are many factors affects the viscosity which are temperature, pressure, molecular weight and inter-molecular forces.

• Viscosity and Temperature :

There is an inverse relationship between the viscosity and the temperature. As the temperature decreases, viscosity increases and the temperature increases, viscosity decrease.

• Viscosity and Pressure :

There is a direct relationship between the viscosity and the pressure. As the pressure decreases, viscosity decreases and the pressure increases, viscosity increases.

• Viscosity and Molecular weight :

There is a direct relationship between the viscosity and the molecular weight. As the molecular weight decreases, viscosity decreases and the molecular weight increases, viscosity increases.

• Viscosity and Inter-molecular force :

There is a direct relationship between the viscosity and the inter-molecular force. As the inter-molecular force decreases, viscosity decreases and the inter-molecular force increases, viscosity increases.

Hence, all the statements are true.