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question_answer1)
The formation of \[S{{O}_{2}}\] and \[S{{O}_{3}}\] explain
A)
the law of conservation of mass done
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B)
the law of multiple proportions done
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C)
the law of definite properties done
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D)
Boyle's law done
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question_answer2)
One gram of which of the following contains largest number of oxygen atoms?
A)
\[O\] done
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B)
\[{{O}_{2}}\] done
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C)
\[{{O}_{3}}\] done
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D)
All contains same done
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question_answer3)
The law of definite proportions was given by -
A)
John Dalton done
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B)
Humphrey Davy done
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C)
Proust done
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D)
Michael Faraday done
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question_answer4)
Molecular mass is defined as the
A)
mass of one atom compared with the mass of one molecule done
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B)
mass of one atom compared with the mass of one atom of hydrogen done
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C)
mass of one molecule of any substance compared with the mass of one atom of C-12 done
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D)
None of these done
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question_answer5)
The chemical symbol for barium is
A)
B done
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B)
Ba done
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C)
Be done
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D)
Bi done
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question_answer6)
A group of atoms chemically bonded together is a (an)
A)
molecule done
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B)
ion done
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C)
salt done
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D)
element done
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question_answer7)
Adding electrons to an atom will result in a (an)
A)
molecule done
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B)
anion done
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C)
cation done
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D)
salt done
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question_answer8)
When an atom loses electrons, it is called a (an) _____ and has a ____ charge.
A)
anion, positive done
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B)
cation, positive done
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C)
anion, negative done
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D)
cation, positive done
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question_answer9)
The molecular formula \[{{P}_{2}}{{O}_{5}}\] means that
A)
a molecule contains 2 atoms of P and 5 atoms of O done
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B)
the ratio of the mass of P to the mass of O in the molecule is 2 : 5 done
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C)
there are twice as many P atoms in the molecule as there are 0 atoms done
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D)
the ratio of the mass of P to the mass of O in the molecule is 5 : 2 done
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question_answer10)
The percentage of copper and oxygen in samples of CuO obtained by different methods were found to be the same. The illustrate the law of
A)
constant proportions done
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B)
conservation of mass done
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C)
multiple proportions done
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D)
reciprocal proportions done
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question_answer11)
The total number of atoms represented by the compound \[CuS{{o}_{4}}.5{{H}_{2}}o\]is
A)
27 done
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B)
21 done
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C)
5 done
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D)
8 done
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question_answer12)
The correct symbol for silver is
A)
Ag done
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B)
Si done
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C)
Ar done
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D)
Al done
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question_answer13)
The cathode ray experiment was done for the first time by
A)
J. J. Thomson done
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B)
John Dalton done
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C)
Goldstein done
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D)
Rutherford done
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question_answer14)
The nucleus of an atom contains
A)
protons done
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B)
electrons done
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C)
protons and neutrons done
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D)
neutrons done
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question_answer15)
By whom was neutron discovered?
A)
Bohr done
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B)
Chadwick done
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C)
Rutherford done
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D)
Dalton done
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question_answer16)
In an atom valence electron are present in
A)
outermost orbit done
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B)
next to outermost orbit done
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C)
first orbit done
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D)
any one of its orbit done
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question_answer17)
Which of the following statements is incorrect for cathode rays?
A)
They move in straight line done
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B)
Their nature depends upon the nature of gas present in the discharge tube. done
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C)
They cost shadow of solid objects placed in their path done
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D)
They get deflected towards positive charge. done
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question_answer18)
The isotopes of an element have
A)
same number of neutrons done
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B)
same atomic number done
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C)
same mass number done
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D)
None of these done
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question_answer19)
Which of the following pairs are isotopes?
A)
Oxygen and ozone done
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B)
Ice and steam done
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C)
Nitric oxide and nitrogen dioxide done
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D)
Hydrogen and deuterium done
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question_answer20)
Which of the following have equal number of neutrons and protons?
A)
Hydrogen done
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B)
Deuterium done
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C)
Fluorine done
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D)
Chlorine done
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question_answer21)
The number of electron in an element with atomic number X and atomic mass Y will be
A)
(X - Y) done
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B)
(Y - X) done
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C)
(X+Y) done
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D)
X done
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question_answer22)
Which of the following has a charge of+1 and a mass of 1 amu?
A)
A neutron done
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B)
A proton done
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C)
An electron done
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D)
A helium nucleus done
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question_answer23)
Which of the following describes an isotope with a mass number of 99 that contains 56 neutrons in its nucleus?
A)
\[_{56}^{99}Ba\] done
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B)
\[_{56}^{43}Ba\] done
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C)
\[_{43}^{99}Tc\] done
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D)
\[_{43}^{56}Tc\] done
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question_answer24)
Which of the following isotopes is used as the standard for atomic mass?
A)
\[^{12}C\] done
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B)
\[^{16}O\] done
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C)
\[^{13}C\] done
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D)
\[^{1}H\] done
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question_answer25)
Which of the following is not a basic particle of an element?
A)
An atom done
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B)
A molecule done
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C)
Anion done
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D)
None of these done
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question_answer26)
Members of which of the following have similar chemical properties?
A)
Isotope done
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B)
Isobars done
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C)
Allotropes done
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D)
Both isotopes and allotropes done
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question_answer27)
While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observation?
A)
Dust particles are present in air done
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B)
Carbon dioxide is present in air done
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C)
Air is a poor conductor of electricity under normal conditions done
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D)
None of these done
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question_answer28)
Which one of the following statement is not true?
A)
Most of the space in an atom is empty done
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B)
The total number of neutrons and protons is always equal in a neutral atom done
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C)
The total number of electrons and protons in an atom is always equal done
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D)
The total number of electrons in any energy level can be calculated by the formula \[2{{n}^{2}}\] done
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question_answer29)
Dalton's atomic theory successfully explained (i) Law of conservation of mass (ii) Law of constant composition (iii) Law of radioactivity (iv) Law of multiple proportion
A)
(ii), (ii) and (iii) done
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B)
(i), (iii) and (iv) done
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C)
(ii), (iii) and (iv) done
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D)
(i), (ii) and (iv) done
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question_answer30)
Which one of the following laws explains the formation of carbon monoxide and carbon dioxide from carbon and oxygen?
A)
Law of conservation of mass done
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B)
Law of multiple proportions done
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C)
Law of reciprocal proportions done
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D)
Law of difinite proportions done
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question_answer31)
The atomic weights are expressed in terms of atomic mass unit. Which one of the following is used as a standard?
A)
\[^{1}{{H}_{1}}\] done
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B)
\[^{12}{{C}_{6}}\], done
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C)
\[^{16}{{O}_{8}}\], done
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D)
\[^{35}C{{l}_{17}}\] done
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question_answer32)
Which would be the electrical charge on a sulphur atom containing 18 electrons?
A)
\[2-\] done
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B)
\[1-\] done
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C)
\[0\] done
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D)
\[2+\] done
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question_answer33)
The atomic number of an element is 11 and its mass number is 23. The correct order representing the number of electrons, protons and neutrons respectively in this atom is
A)
11, 11, 12 done
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B)
11, 12, 11 done
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C)
12, 11, 11 done
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D)
23, 11, 23. done
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question_answer34)
In an atom valence electron are present in
A)
outermost orbit done
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B)
next to outermost orbit done
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C)
first orbit done
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D)
any one of its orbit done
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question_answer35)
In a chemical change the total weight of the reacting substances compared to total weight of products is
A)
never the same done
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B)
always less done
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C)
always more done
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D)
always the same done
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