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
Besides VSEPR and the Kossel Lewis approach, which two theories are listed?Which theory is abbreviated VSEPR?Why can lattice enthalpy not be calculated directly from attraction and repulsion alone?Ionic bonds form most easily between elements with low ionization enthalpies and high negaWhat is the lattice enthalpy of sodium chloride?Lattice enthalpy is the energy required to separate one mole of an ionic solid into:The structures contributing to a resonance hybrid are called:Why was the concept of resonance introduced?