Embibe Experts Solutions for Chapter: Physical and Chemical Changes, Exercise 1: NDA & NA EE 2019 Paper 1 General Ability Test

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 $\left(v\right)$ of the centre of mass of the object.

$2$. Chemical reactions happening in the system cannot change the kinetic energy of the particles inside concerning the centre of mass of the object.

Select the correct answer using the code given below:

Which one of the following energy is stored in the links between the atoms?

Which one of the following metals does not react with cold water?

Which one of the following could be the melting point of iron?

On exposure to moist air, copper gains a green coat on its surface due to the formation of which one of the following compounds?

Which one of the following will not produce carbon dioxide on reacting with an aqueous solution of hydrochloric acid?