Sodium can be cut with a knife.

An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following.

Classify the following as physical or chemical properties. (a) The composition of a sample of steel is : 98% iron, 1.5% carbon and 0.5% other elements. (b) Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas. (c) Metallic sodium is soft enough to be cut with a knife. (d) Most metal oxides form alkalis on interacting with water.

Which of the following metals can easily be cut with a knife?

Which one of Na, Cu and Zn can be easily cut with a knife?

Name a metal : that can be cut with knife,

Sodium can be extracted on a commercial scale by the electrolysis of used sodium chloride. The process is called

Explain the following : (a) It is easier to cut with a sharp knife than with a blunt one. (b) Sleepers are laid below the rails.

Sodium metal can be stored under :

Assume that a pencil box held in your hand, represents a plant cell. In how many possible planes can it be cut ? Indicate these cuts with the help of line drawings ?

A flower can be cut into two equal or identical halves in any radial plane passing through the centre. This flower will be