Chemistry | Study Mode

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Question 1
A
Electron 
B
Neutron 
C
Nucleus 
D
Proton 
Explanation.
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An element's chemical properties depend on its valence electrons.The chemical properties of elements depend on an element's electron configuration.


Correct Option:
A
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Question 2
A
graduated beaker 
B
pipette 
C
test tube 
D
burette 
Explanation.
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Test tubes are convenient containers for heating small amounts of liquids or solids with a Bunsen burner or alcohol burner.


Correct Option:
C
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Question 3
A
quantity of electrons in the valence shell 
B
filling the orbitals with lower energy first 
C
the filling of degenerated orbitals 
D
quantum numbers of electrons 
Explanation.
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Pauli Exclusion Principle states that, in an atom or molecule, no two electrons can have the same four electronic quantum numbers.


Correct Option:
D
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Question 4
A
\(Zn^{2+}\) 
B
\(Sc^{3+}\) 
C
Cu 
D
\(Mn\) 
Explanation.
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Scandium has electronic configuration \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{1}4s^{2}\) hence, \(Sc^{3+}\) has configuration \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}\). Hence, no electron in the 3d-orbital.


Correct Option:
B
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Question 5
A
nitrogen is less dense than oxygen 
B
oxygen is more reactive than nitrogen 
C
of the difference in their boiling points 
D
they belong to the same period 
Explanation.
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The various gases vaporize as their boiling points are reached, then they are pumped away and separately re-liquefied for convenient storage.


Correct Option:
C
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Question 6
A
boiling point 
B
melting point 
C
conductivity 
D
solubility 
Explanation.
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The purity of a solid can be determined by measuring the melting point. A pure solid will have a single, sharp melting point.


Correct Option:
B
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Question 7
A
66.0g 
B
76.0g 
C
80.0g 
D
96.0g 
Explanation.
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This is same as asking for the molar mass of the compound

= \((2\times 14.0)+ (8\times 1.0) + 12.0+(16.0\times 3)\)

= 28.0+8.0+12.0+48.0 = 96.0g


Correct Option:
D
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Question 8
A
the circular path through which electrons revolve round the nucleus 
B
a region around the nucleus where electrons are most likely to be found 
C
the path around the nucleus through which electrons move 
D
the path around the nucleus through which protons move 
Explanation.
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The orbital is a path or region around the nucleus. The electrons move in the orbitals and not through it.


Correct Option:
B
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Question 9
A
electronegativity 
B
electron affinity 
C
ionic radius 
D
ionization energy 
Explanation.
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The ionic radius decreases across a period but increases along a group.


Correct Option:
C
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Question 10
A
nuclear charge increases while the outermost electrons are drawn closer to the nucleus 
B
nuclear charge decreases while the outermost electrons are drawn closer to the nucleus 
C
valence electrons increase across the period while the valence shell remains constant 
D
nuclear charge decreases while the distance of the valence shell from the nucleus is increasing 
Explanation.
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This is caused by the increase in the number of protons and electrons across a period.


Correct Option:
A
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