The bottle of liquid ammonia is cooled before opening the seal. Why?

Ammonia is a good complexing agent. Why?

Ammonia is soluble in water . Explain why?

Why ammonia is a stronger base than phosphine?

Why should a magnesium ribbon be cleaned before burning in air?

Explain why Surface tension of a liquid is independent of the area of the surface

Explain why friction is necessary to make the disc in Fig. 7.41 roll in the direction indicated. (a) Give the direction of frictional force at B, and the sense of frictional torque, before perfect rolling begins. (b) What is the force of friction after perfect rolling begins?

When soda water bottle is suddenly opened, effervescenece is produced. Why?

Why hard water is softened before using in boiler?

A hemispherical bowl of radius 9 cm is full of liquid. The liquid is to be filled into cylindrical shaped small bottles, each of diameter 3 cm and height 4 cm. How many bottles are needed to empty the bowl.