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Chemistry - 9 Chapter - 3
Atomic Structure
Test - 20
1.
What do you understand by Protium, Deutrium and Tritium?
a) Protium is isotope of Hydrogen having atomic mass I and atomic number as 1, written as 1/1 H. Deutrium is also isotope of Hydrogen having atomic mass as 2, atomic number 1 and written as 2/1H or D. Similarly Tritium is written as 3/1 R or T
b) Protium is isotope of Hydrogen having atomic mass I and atomic number as 1, written as 1/1 H. Deutrium is also isotope of Hydrogen having atomic mass as 2, atomic number 1 and written as 2/1H or D. Similarly Tritium is written as 3/1 H or T
2.
Define light water and heavy water?
a) Light water is formed by light isotope 1/1 H (Protium) of water and written as H^2 O and Heavy water is formed by heavy isotope of water 2/1 or D (Deutrium) and its formula is F
2
O.
b) Light water is formed by light isotope 1/1 H (Protium) of water and written as H
2
O and Heavy water is formed by heavy isotope of water 2/1 or D (Deutrium) and its formula is D^2 O.
3.
Atoms of an element always have same atomic mass?
a) False
b) True
4.
The word postulate means Something absolutely true?
a) True
b) False
5.
________ is a substance in which all atoms are similar, having same atomic number and cannot be divided into simpler substances by chemical methods.Total 109 _______ exist which include 92 natural and 17 artificial.
a) Atom
b) Element
c) Molecule
d) Compound
6.
_____ is the smallest, invisible and distinct part of an element, which contains all properties of that element, and cannot be further sub divided by ordinary means. It is made up of a positively charged nucleus surrounded by electrons in various orbits. it do not divide in chemical reactions but can be divided in neuclear reactions.
a) Atom
b) Compound
c) Molecule
d) Ion
7.
Nucleus is the central part of an atom containing protons and ions.
a) False
b) True
8.
Proton is the smallest positively charged particle present in few items.
a) False
b) True
9.
The mass of any proton is equal to the mass of hydrogen nucleus.
a) True
b) False
10.
Mass of neutron is slightly less than that of a proton.
a) False
b) True
11.
The Atomic Mass or Mass Number is total number of protons and neutrons present in the nucleus of an atom.
a) False
b) True
12.
Atomic Number is equal to the number of neutrons present in the nucleus of an atom.
a) False
b) False
13.
Atomic Spectrum is spectrum of radiations emitted by the excited atoms when they come to the normal state.
a) False
b) True
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