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An atom consists of nucleus surrounded by electrons moving in circular path called orbits. Which of the following supports the above statement?

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Important Questions on Chemistry

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UPSC CAPF AC Paper - I
IMPORTANT
Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 32

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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UPSC CAPF AC Paper - I
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Encyclopedia of General Science for General Competitions>Chapter 2 - Chemistry>Assessment>Q 33
Rutherford's scattering experiment proved the presence of:
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UPSC CAPF AC Paper - I
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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?
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UPSC CAPF AC Paper - I
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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:
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UPSC CAPF AC Paper - I
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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:

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UPSC CAPF AC Paper - I
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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?

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