Chemistry - 9 Chapter - 3Atomic StructureTest - 18

Chemistry - 9 Chapter - 3
Atomic Structure
Test - 18

1. What is the number of neutron in Hydrogen.

a) 2
b) 0
c) 3
d) 1

2. What is meant by 1s? ( Such questions are in fact Short Answer Questions. You are required to make a choice between a correct and a wrong short answer. There is a change of only one odd word. You should remember these by heart. )

a) Subshell "s" in shell (orbit) 1, having two electrons.
b) Subshell "s" in shell (orbit) 1, having one electron.

3. Why Dalton atomic theory had to be amended?

a) Due to discovery of isotopes and the sub-atomic particles of an atom
b) Due to discovery of isotopes and the sub-atomic particles of an element.

4. Which postulate of the Daltons atomic theory is considered correct even now?

a) Item can neither be created nor destroyed in physical actions.
b) Item can neither be created nor destroyed in chemical actions.

5. Which experiments through light on the discovery of three fundamental participles of atom.

a) Natural and artificial radioactivity
b) Passage of electric current through gases at low pressure.

6. Define radioactive rays?

a) Certain types of rays, which cause fogging of the photographic plates and are emitted by radioactive materials like uranium, radium etc.
b) Certain types of rays, which cause fogging of the photographic plates and are emitted by non-radioactive materials like uranium, radium etc.

7. Define radio activity?

a) Phenomenon of emission of radioactive rays from radioactive materials.
b) Phenomenon of emission of radioactive rays from non-radioactive materials.

8. What are the types of radioactive rays? ( Select wrong one )

a) Alpha rays
b) Gamma rays.
c) Beta Rays
d) X Rays

9. Why alpha rays can't pass through a thick metal foil?

a) Because of metal
b) Because of their heavy mass.

10. What is transmutation?

a) Transmutation is change in chemical properties of radioactive elements because of the emission of radioactive rays. Due to this element is converted to another element.
b) Transmutation is change in chemical properties of radioactive elements because of the emission of radioactive rays. Due to this element is not converted to another element.

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