Hydrogen has a tendency to gain one electron to acquire the helium configuration. In this respect,it resembles:

Which hydride among the following is less stable?

Tritium undergoes radioactive decay giving

Given below are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A:$ Isotopes of hydrogen have almost same chemical properties,but difference in their rates of reaction.
Reason $R:$ Isotopes of hydrogen have different enthalpy of bond dissociation.
In the light of the above statements,choose the most appropriate answer from the options given below:

Fire extinguishers contain $H_2SO_4$ and which one of the following?

Which of the following is the water-gas shift reaction?