7000+ Chemistry MCQ Questions and Answers 2024 - 2025 Pdf - 1

Question: 1

Fr, Sr, Ba, Ra which of the elements are radioactive?

(A) Fr, Sr

(B) Sr, Ra

(C) Fr, Ba

(D) Fr, Ra

Question: 2

Total number of electrons in the M shell is

(A) 2 electrons

(B) 8 electrons

(C) 18 electrons

(D) 28 electrons

Question: 3

Modern periodic law states that the physical and chemical properties of elements are the periodic functions of their

(A) Atomic masses

(B) Atomic numbers

(C) Anomalies

(D) Similarities

Question: 4

In which separation method, a substance changes directly solid to gaseous state when heated?

(A) Chromatography

(B) Centrifugation

(C) Distillation

(D) Sublimation

Question: 5

The separation of denser particles from lighter particles done by rotation at high speed is called

(A) Centrifugation

(B) Decantation

(C) Filtration

(D) Sedimentation