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Q:

सोडियम, लीथियम, कैल्सियम और निकेल में से किस धातु को चाकू से काटा जा सकता है ?

  • 1
    सोडियम
  • 2
    लीथियम
  • 3
    कैल्सियम
  • 4
    सभी
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Answer : 1. "सोडियम"
Explanation :

Alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife. The freshly cut surface is a shiny, silver colour, but this tarnishes quickly to a dull grey as the metal reacts with oxygen and water in the air.

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