Which one of the following metals is alloyed with sodium to transfer heat in a nuclear reactor?

Let there be an object having some chemicals in it. It starts moving with a uniform velocity v and a chemical reaction starts happening. In this case, which of the following statement(s) is/are correct?

1. Chemical reactions happening in the system cannot change the velocity (v) of the centre of mass of the object.

2. Chemical reactions happening in the system cannot change kinetic energy of the particles inside with respect to the centre of mass of object.

Select the correct answer using the code given below :

Which one of the following compounds does not exhibit a different oxidation number of the same element?

Which one of the following statements about glass is not correct?