NEET 2023 Question Paper Mock Test

Select the correct statements from the following:A. Atoms of all elements are composed of two fundamental particles.B. The mass of the electron is $9.10939\times 10^{-31}\text{kg}$.C. All the isotopes of a given element show same chemical properties.D. Protons and electrons are, collectively known as nucleons.E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter.Choose the correct answer from the options given below:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:Assertion A: A reaction can have zero activation energy.Reason R: The minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to threshold value, is called activation energy.In the light of the above statements, choose the correct answer from the options given below:

A compound is formed by two elements A and B. The element B forms cubic close packed structure and atoms of A occupy $1/3$ of tetrahedral voids. If the formula of the compound is ${\text{A}}_x{\text{B}}_y$, then the value of $x+y$ is:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:Assertion A: Metallic sodium dissolves in liquid ammonia giving a deep blue solution which is paramagnetic.Reason R: The deep blue solution is due to the formation of amide.In the light of the above statements, choose the correct answer:

Amongst the following, the total number of species not having eight electrons around the central atom in its outermost shell is:${\text{NH}}_3,{\text{AlCl}}_3,{\text{BeCl}}_2,{\text{CCl}}_4,{\text{PCl}}_5$