In a chemical reaction, very active metals like sodium react with
ACold water vigorously
BSteam only at high temperature
CDry oxygen at room temperature
DLiquid nitrogen at low temperature
Answer & Solution
Correct answer: A. Cold water vigorously
1. The chapter lists three classes of metals by reactivity with water.
2. Very active metals (Na, K, Ca) react with cold water.
3. They release hydrogen gas and form hydroxides.
4. So option A is correct.
_Source: Selina Concise Chemistry Class 8, Ch on Hydrogen (Mistral OCR'd PDF), section on reaction with water_
Related questions
Hydrogen has valency 1 because its atom hasWhy is hydrogen filled in weather balloons rather than helium in many cases?Hydrogen reduces hot copper(II) oxide to giveWhen iron is heated with steam at very high temperature, the products areWhen hot magnesium metal is heated with steam, the gas evolved isHydrogen is regarded as the fuel of the future becauseHydrogenation of vegetable oils producesHydrogen is used in industry mainly for