EASY
UPSC CAPF AC Paper - I
IMPORTANT
Earn 100

Assertion (A): Atoms are neither created nor destroyed only reorganisation of atoms take place in chemical reactions.

Reason (R): The atom of an element is the smallest particle which takes part in chemical reaction.

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Important Questions on Chemistry

EASY
UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 33
Rutherford's scattering experiment proved the presence of:
EASY
UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 34
Which of the following is incorrect regarding to Bohr's atomic model?
EASY
UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 35
When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. They emit light, which we can observe in:
MEDIUM
UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 36

Match the following Columns.

Column I Column II
A. John Dalton 1. Law of conservation of mass
B. A Lavoisier 2. Law of reciprocal proportions
C. Richter 3. Law of gaseous volume
D. Gay Lussac 4. Law of multiple proportion

Codes:

MEDIUM
UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 37

Consider the following statements:

I. Matter can neither be created nor be destroyed.

II. Total mass of reactants are always equal to the total mass of the products.

III. Atoms are the smallest unit of matter.

Which of the above statements are correct?

EASY
UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 38
The three basic components of an atom are:
MEDIUM
UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 39
Matter waves are:
HARD
UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 40

Match the entries in Column (I) with the correctly related quantum numbers in Column (II).

Column I Column II
A. Clockwise or anti-clockwise spins of an electron on its axis. 1. Principal quantum number
B. It describes position and energy of the electron in an orbit. 2. Azimuthal quantum number
C. It describes subshell. 3. Magnetic quantum number
D. It describes preferred orientations of orbitals in space. 4. Electron spin quantum number

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