An element $A$ is soft and can be cut with a knife. This is very reactive with air and cannot be kept open in the air. It reacts vigorously with water. The element $A$ is:

Magnesium

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Sodium

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Gold

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Calcium

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Solution

The correct option is C Sodium
Sodium is so soft that it can be cut with a knife. It is so reactive with air that it vigorously catches fire when kept open in the air and hence, we keep it immersed in kerosene oil. It also reacts vigorously with water.

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Q. 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

Q. An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
(a) Mg
(b) S
(c) P
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Q. Question 25
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:
(a)

Mg

(b)

Na

(c)

P

(d)

Ca

An element is soft can be cut easily with a knife.It is very reactive and cannot be kept open in the air.It reacts vigorously with water.This element is most likely to be:

(a) magnesium

(b) potassium

(d) aluminium

Q. 'X' metal is soft and can be easily cut with a knife. It catches fire when exposed to air and water and is also used in street lights. What is 'X'?

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

The correct option is C SodiumSodium is so soft that it can be cut with a knife. It is so reactive with air that it vigorously catches fire when kept open in the air and hence, we keep it immersed in kerosene oil. It also reacts vigorously with water.

An element $A$ is soft and can be cut with a knife. This is very reactive with air and cannot be kept open in the air. It reacts vigorously with water. The element $A$ is:

The correct option is C Sodium
Sodium is so soft that it can be cut with a knife. It is so reactive with air that it vigorously catches fire when kept open in the air and hence, we keep it immersed in kerosene oil. It also reacts vigorously with water.