A silvery white metal X reacts with water at room temperature to produce a water soluble compound Y and a colourless gas Z. The reaction is highly exothermic and the Z catches fire immediately during the reaction. The solution of Y in the water on reacting with the stoichiometric amount of dilute solution of hydrochloric acid gives a solution of pH = 7.0. The compounds X, Y and Z respectively are :
A silvery white metal X reacts with water at room temperature to produce a water soluble compound Y and a colourless gas Z. The reaction is highly exothermic and the Z catches fire immediately during the reaction. The solution of Y in the water on reacting with the stoichiometric amount of dilute solution of hydrochloric acid gives a solution of pH = 7.0. The compounds X, Y and Z respectively are :
The correct option is D Na,NaOHandH2
Aluminum metal rapidly develops a thin layer of aluminum oxide of a few millimeters that prevents the metal from reacting with water and Al(OH)3 is a form of flocs and reaction of aluminum with water is not exothermic.
Thus, option (A) is incorrect.
Ag does not react with pure water.Therefore option (B) is not possible.
Potassium reacts rapidly and intensely with water, forming a colourless basic potassium hydroxide solution and hydrogen gas, according to the following reaction mechanism:2K(s)+2H2O(l)→2KOH(aq)+H2(g)
This is an exothermal reaction and potassium is heated to such an extend that it burns a purple flame. Additionally, hydrogen released during the reaction strongly reacts with oxygen and ignites.
Thus if in option (C), second compound would be KOH then it might be right answer but KCl is considered as second compound or Y.
So option (C) is incorrect.
Since Z catches fire immediately during reaction and the reaction with water is highly exothermic. Hence as per given hint it should be Na as NaOH as Y and H2 as Z.
Thus, option (D) is correct.
Aluminum metal rapidly develops a thin layer of aluminum oxide of a few millimeters that prevents the metal from reacting with water and Al(OH)3 is a form of flocs and reaction of aluminum with water is not exothermic.
Thus, option (A) is incorrect.
Ag does not react with pure water.
Potassium reacts rapidly and intensely with water, forming a colourless basic potassium hydroxide solution and hydrogen gas, according to the following reaction mechanism:
2K(s)+2H2O(l)→2KOH(aq)+H2(g)
This is an exothermal reaction and potassium is heated to such an extend that it burns a purple flame. Additionally, hydrogen released during the reaction strongly reacts with oxygen and ignites.
Thus if in option (C), second compound would be KOH then it might be right answer but KCl is considered as second compound or Y.
So option (C) is incorrect.
Since Z catches fire immediately during reaction and the reaction with water is highly exothermic. Hence as per given hint it should be Na as NaOH as Y and H2 as Z.
Thus, option (D) is correct.
