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प्रश्न
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 ______.
पर्याय
Mg
S
P
Na
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उत्तर
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 Na.
Explanation:
Sodium (Na) is an alkali metal that is exceptionally soft and can be easily cut with a butter knife. Due to its extreme reactivity with atmospheric oxygen and moisture, it ignites easily in open air and reacts violently with water to form hydrogen gas, so it must be stored in kerosene. Non-metals like sulphur (S) and phosphorus (P) are brittle, while magnesium (Mg) is a harder alkaline earth metal that reacts slowly with water.
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संबंधित प्रश्न
Name the following:
Metals which forms an amphoteric oxide.
Why is sodium kept immersed in kerosene oil?
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It does not react with any physical state of water.
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An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns red litmus blue. State whether element X is metal or a non - metal. Explain with a proper example.
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The substance that will be flattened on beating with a hammer is ______.
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