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question_answer1)
Which pair of substances given below are isotopes?
A)
\[_{6}^{12}C\]and\[_{6}^{14}C\] done
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B)
Carbon dioxide and carbon monoxide done
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C)
Diamond and graphite done
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D)
\[{{C}_{2}}{{H}_{4}}\]and\[{{C}_{3}}{{H}_{6}}\] done
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question_answer2)
Which valence shell electron arrangement is that of a metallic element?
A)
\[2,\,\,1\] done
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B)
\[2,\,\,4\] done
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C)
\[2,\,\,5\] done
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D)
\[2,\,\,7\] done
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question_answer3)
An element \[X\] has two isotopes, which may be represented as \[^{238}X\] and\[^{235}X\]. How does \[^{238}X\] differ from\[^{235}X\]?
A)
\[^{238}X\]has \[3\] more protons and \[3\] more electrons than\[235\]. done
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B)
\[^{238}X\] has \[3\] more protons, but same number of electrons as\[235\]. done
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C)
\[^{238}X\] has \[3\] more neutrons, but the electrons or protons are same as\[235\]. done
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D)
\[^{238}X\] has \[3\] more protons, but same number of electrons as\[235\]. done
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question_answer4)
An atom of an element contains \[17\] protons, \[18\] neutrons and \[17\] electrons. Which of the following will be the atomic structure of another isotope of this element?
A)
B)
C)
D)
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question_answer5)
The diagram given below represents the atom of an element.
Which symbol gives the above information?
A)
\[_{4}^{9}Be\] done
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B)
\[_{4}^{9}F\] done
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C)
\[_{4}^{9}B\] done
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D)
\[_{4}^{9}O\] done
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question_answer6)
What does an atom and an ion of the isotope of sodium \[_{11}^{22}Na\] both contain?
A)
\[11\] electrons done
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B)
\[12\] neutrons done
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C)
\[23\] protons done
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D)
\[23\] neutrons done
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question_answer7)
What can be deduced from the symbol\[_{2}^{4}He\]?
A)
An atom of helium contains two electrons. done
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B)
An atom of helium has two protons and four neutrons in its nucleus. done
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C)
The proton (atomic) number of helium is four. done
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D)
Helium acts as a diatomic molecule. done
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question_answer8)
Which of the following ions has the same number of electrons as a krypton atom with atomic number\[36\]?
A)
Chlorine done
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B)
Sodium done
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C)
Rubidium done
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D)
Xenon done
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question_answer9)
In elements \[_{15}^{31}P\]and\[_{16}^{32}S\], which of the following are the same?
A)
Number of nucleons done
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B)
Number of electrons done
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C)
Number of neutrons done
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D)
Number of protons done
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question_answer10)
What is valency?
A)
The combining capacity of an element done
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B)
The atomicity of an element done
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C)
The oxidation number of an element done
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D)
All of the above done
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question_answer11)
An element \[X\] forms a un-positive ion with the electronic structure\[2,\,\,8,\,\,8\]. What is the atomic number of\[X\]?
A)
\[16\] done
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B)
\[17\] done
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C)
\[18\] done
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D)
\[19\] done
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question_answer12)
The letters \[X,\,\,Y\] and \[Z\] represent different atoms. \[_{19}^{40}X\,\,\,\,\,_{19}^{39}Y\,\,\,\,\,\,\,_{20}^{40}Z\] What can be deduced from the proton numbers and nucleon numbers of\[X,\,\,Y\] and\[Z\]?
A)
\[X\] and \[Y\] are the same elements. done
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B)
\[X\] and \[Z\] are the same elements. done
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C)
\[X\] has more protons than \[Y\]. done
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D)
\[Z\] has more neutrons than\[Y\]. done
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question_answer13)
What is the maximum number of electrons that can be accommodated in the 4th energy level?
A)
\[32\] done
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B)
\[18\] done
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C)
\[2\] done
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D)
\[8\] done
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question_answer14)
A neutral atom of an element has a nucleus with a nuclear charge \[13\] times and mass \[27\] times as that of hydrogen nucleus. What is the ratio of electrons to protons in its stable positively charged ion?
A)
\[27:13\] done
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B)
\[10:13\] done
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C)
\[20:24\] done
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D)
\[10:14\] done
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question_answer15)
What does Bohr's atomic theory explain?
A)
About quantum numbers done
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B)
About the shape of sub-levels done
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C)
About nucleus done
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D)
About stationary states done
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question_answer16)
Which of the following observations of \[\alpha -\]ray scattering experiment led to the discovery of a small positively charged nucleus in the centre?
A)
Most of the \[\alpha -\]particles passed straight. done
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B)
Most of the \[\alpha -\]particles rebounded after hitting the atoms. done
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C)
Only a few \[\alpha -\]particles deflected away from their path. done
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D)
Most of the \[\alpha -\]particles rebounded. done
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question_answer17)
Which of the following electronic configurations is incorrect7
A)
\[Be(4)=2,\,\,2\] done
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B)
\[O(8)=2,\,\,6\] done
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C)
\[S(16)=2,\,\,6,\,\,8\] done
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D)
\[P(15)=2,\,\,8,\,\,5\] done
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question_answer18)
An atom has mass number 23 and atomic number\[11\]. How many protons, electrons and neutrons are present in the atom?
A)
\[11,\,\,12,\,\,13\] done
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B)
\[11,\,\,11,\,\,12\] done
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C)
\[11,\,\,11,\,\,13\] done
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D)
\[11,\,\,14,\,\,15\] done
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question_answer19)
Which of the following electronic configurations represents a noble gas?
A)
\[2,\,\,8,\,\,2\] done
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B)
\[2,\,\,8,\,\,6\] done
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C)
\[2,\,\,8\] done
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D)
\[2,\,\,8,\,\,8,\,\,2\] done
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question_answer20)
An element has atomic number \[17\] and mass number\[37\]. There are \[17\] electrons outside the nucleus. Find the number of neutrons in it.
A)
\[20\] done
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B)
\[21\] done
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C)
\[17\] done
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D)
\[37\] done
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question_answer21)
What does the mass number of an atom represent?
A)
Only the number of protons done
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B)
The number of protons and neutrons done
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C)
The number of protons and electrons done
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D)
Only the number of neutrons done
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question_answer22)
The atom of an element has \[10\] electrons, \[10\] protons and \[12\] neutrons. Find the mass number of the element.
A)
\[10\] done
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B)
\[12\] done
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C)
\[22\] done
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D)
\[32\] done
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question_answer23)
\[_{17}^{35}Cl\]and \[_{17}^{37}Cl\] are examples of\['X'\]. What is\['X'\]?
A)
Isobars done
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B)
Isotopes done
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C)
Isotones done
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D)
Isomers done
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question_answer24)
Which of the following statements is false?
A)
Neutron has the highest mass among the fundamental particles. done
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B)
The mass of an electron is negligible. done
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C)
The value of e/m is the highest for a proton. done
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D)
Charge of a neutron is zero. done
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question_answer25)
Which of the following is true about the \[e/m\] value of positive particles?
A)
It is constant. done
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B)
It depends on the gas taken in the discharge tube. done
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C)
It depends on the nature of cathode and anode taken. done
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D)
It depends on the fluorescent material coated on the screen. done
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question_answer26)
Element \['X'\] contains \[9\] protons, \[10\] electrons and \[11\] neutrons. What is\['X'\]?
A)
A neutral atom done
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B)
An isotope done
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C)
A cation done
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D)
An anion done
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question_answer27)
Which of the following are present in an atom with atomic number \[82\] and mass number\[208\]?
A)
\[82\] protons and \[82\] electrons done
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B)
\[82\]protons and \[126\] neutrons done
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C)
\[82\]protons, \[82\] electrons and \[126\] neutrons done
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D)
\[82\]neutrons, \[126\] protons and \[126\] electrons done
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question_answer28)
Which of the following ions is the smallest in size?
A)
\[M{{g}^{2+}}\] done
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B)
\[N{{a}^{+}}\] done
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C)
\[{{O}^{2-}}\] done
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D)
\[{{F}^{-}}\] done
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question_answer29)
Which of the following gas when taken in the discharge tube produces maximum specific charge of positive rays?
A)
Oxygen done
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B)
Nitrogen done
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C)
Helium done
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D)
Hydrogen done
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question_answer30)
In an element, the number of protons, electrons and neutrons are \[1,\,\,0,\,\,1\] respectively. Identify the element.
A)
\[{{D}^{+}}\] done
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B)
\[{{H}^{+}}\] done
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C)
\[He\] done
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D)
\[L{{i}^{+}}\] done
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question_answer31)
What is the maximum number of electrons in the main shell of an atom?
A)
\[{{n}^{2}}\] done
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B)
\[2{{n}^{2}}\] done
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C)
\[2n\] done
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D)
\[4n+1\] done
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question_answer32)
How many protons, neutrons and electrons are contained in one atom of\[_{19}^{39}K\]?
A)
\[19\] protons \[+\,\,20\] neutrons \[+\,\,19\] electrons done
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B)
\[19\] protons \[+\,\,20\] neutrons \[+\,\,20\] electrons done
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C)
\[20\] protons \[+\,\,19\] neutrons \[+\,\,20\] electrons done
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D)
\[20\] protons \[+\,\,20\] neutrons \[+\,\,19\] electrons done
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question_answer33)
What do oxygen atom and oxide ion have in common?
A)
Same size done
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B)
Same number of electrons done
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C)
Same electronic configuration done
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D)
Same number of protons done
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question_answer34)
Identify the number of electrons present in the outermost shell of atoms of each of the following elements.
A)
(i) - 2, (ii) - 3, (iii) ? 4 done
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B)
(i) - 1, (ii) - 4, (iii) ? 6 done
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C)
(i) - 2, (ii) - 2, (iii) ? 6 done
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D)
(i) - 3, (ii) - 4, (iii) ? 5 done
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question_answer35)
The atomic numbers of three elements \[P,\,\,Q\] and \[R\] are \[5,\,\,9\] and \[13\] respectively. Which two elements show similar chemical properties?
A)
\[P\]and\[Q\] done
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B)
\[P\] and \[R\] done
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C)
\[Q\]and\[R\] done
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D)
\[P,\,\,Q\]and\[R\] done
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question_answer36)
Identify the element having two electrons in the K shell of its atom.
A)
Hydrogen done
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B)
\[H{{e}^{+}}\] done
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C)
Helium done
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D)
Deuterium done
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question_answer37)
The total number of electrons in a nitrogen atom and a chlorine atom are \[7\] and \[17\] respectively. Find the number of valence electrons in them.
A)
\[3,\,\,1\] done
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B)
\[5,\,\,8\] done
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C)
\[4,\,\,1\] done
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D)
\[5,\,\,7\] done
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question_answer38)
An element has an atomic number 20. How many electrons will be present in \[K,\,\,L,\,\,M\] and \[N\] shells of its atom?
A)
\[2,\,\,8,\,\,6,\,\,4\] done
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B)
\[2,\,\,8,\,\,7,\,\,3\] done
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C)
\[3,\,\,7,\,\,7,\,\,3\] done
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D)
\[2,\,\,8,\,\,8,\,\,2\] done
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question_answer39)
An atom and its ion differ in the number of
A)
electrons done
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B)
protons done
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C)
neutrons done
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D)
nucleons done
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question_answer40)
What is the ratio of the neutrons present in carbon and silicon atoms with respect to their atomic masses? (Atomic mass of carbon and silicon are \[12\] and \[28\] respectively)
A)
\[3:7\] done
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B)
\[7:3\] done
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C)
\[3:4\] done
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D)
\[6:28\] done
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question_answer41)
According to JJ. Thomson's atomic model, where are the negative charges of an atom embedded in?
A)
A lump of positive charge done
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B)
A lump of small atoms done
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C)
A lump of neutrons done
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D)
The nucleus done
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question_answer42)
Which of the following conclusions cannot be drawn on Rutherford's atomic model?
A)
The total mass of an atom is concentrated at the centre of the atom. done
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B)
Nucleus is located inside the atom containing positively charged particles. done
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C)
Most of the atom is empty in space. done
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D)
Electrons revolve around the nucleus in stationary, circular orbits. done
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question_answer43)
Which of the following is a pair of isobars?
A)
\[_{7}^{15}N,\,\,_{8}^{16}O\] done
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B)
\[_{6}^{13}C,\,\,_{7}^{14}N\] done
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C)
\[_{6}^{13}C,\,\,_{7}^{13}N\] done
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D)
\[_{6}^{13}C,\,\,_{8}^{15}O\] done
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question_answer44)
An isotope of helium is represented by the symbol\[_{2}^{3}He\]. How many protons, neutrons and electrons are there in an atom of the isotope?
A)
B)
C)
D)
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question_answer45)
How are the two atoms\[_{92}^{235}P\] and\[_{92}^{238}P\]similar?
A)
Only (i) done
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B)
Only (i) and (ii) done
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C)
Only (i) and (iii) done
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D)
(i), (ii) and (iii) done
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question_answer46)
Identify the least reactive element from the following.
A)
\[_{8}^{16}X\] done
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B)
\[_{10}^{20}X\] done
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C)
\[_{11}^{23}X\] done
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D)
\[_{9}^{19}X\] done
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question_answer47)
What is the ratio of the number of neutrons present in potassium and magnesium atoms with mass numbers \[39\] and \[24\] respectively?
A)
\[19:12\] done
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B)
\[5:3\] done
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C)
\[5:6\] done
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D)
\[4:3\] done
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question_answer48)
A beam of alpha-particles is fired at a piece of gold foil as shown below.
After striking the gold foil, in which direction do most of the alpha-particles travel?
A)
\[P\] done
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B)
\[Q\] done
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C)
\[R\] done
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D)
\[S\] done
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question_answer49)
Which of the following statements about the isotopes of an element is NOT correct?
A)
Isotopes have the same proton number. done
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B)
Isotopes have the same chemical properties. done
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C)
Isotopes have the same nucleon number. done
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D)
Atoms of the isotopes of the element have the same number of electrons. done
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question_answer50)
An element \[X\] combines with oxygen to form compounds \[P\] and\[Q\]. If the ratio of the valency of element \[X\] in \[P\] to element \[X\] in \[Q\] is \[3:5\] respectively, what could be the probable compounds \[P\] and\[Q\]?
A)
B)
C)
D)
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