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Worksheetsquiz 2 sec 2
Total questions: 20
Worksheet time: 10mins
Which of the following molecules contains the highest number of the lone pairs of electrons ?
F2
CH4
CO2
H2O
Which of the elements forming the opposite compound has higher partial negative charge? ……………
I
Br
F
Cl
Which of the following choices represents hydrogen cyanide HCN? ……………
Carbon atom 6C has one lone pair of electrons.
Nitrogen atom 7N has one lone pair of electrons.
Hydrogen atom 1H has one lone pair of electrons.
Nitrogen atom 7N has two lone pair of electrons
Which of the following is not a type of chemical bonding?
Metallic
ionic
nuclear
The molecule of the element with an electronic configuration 1s2 ,2s2 ,2p6 consist of ……………… atom(s).
one
two
three
four
What is the number of unpaired electrons in 7N3- ion? ……………
zero
1
2
3
Which of the following compounds its solution is characterized by its ability to conduct electricity?...............
C2H4
KCl
CH4
C2H6
The molecules of ......... are similar in their stereostructure
H2O and ClO2
BF3 and BeF2
CH4 and NH3
H2O and NH3
In which of the following compounds the angle between the bonds is higher? ……
CO2
BF3
CCl4
NF3
Why is the formula for sodium chloride NaCl , but the formula for magnesium chloride is MgCl2 ?
Chlorine forms a -1 ion so it requires two magnesium ions to form an electrically neutral compound.
Magnesium forms +2 ions, so it requires one chloride ion to form an electrically neutral compound.
Magnesium forms +2 ions, so it requires two chloride ions to form an electrically neutral compound
Ionic structures are composed of oppositely charged ions. Why are solid ionic structures electrical insulators rather than conductors?
Each ion is balanced by those of the opposite charge, making the structure neutral overall.
The regular arrangement of ions causes a reversal of the electric field, opposing the flow of ions.
The ions are locked in place and cannot move in response to an applied electric field.
SO3 molecule agrees with SO2 molecule in …………………
the stereostructure.
the arrangement of electron pairs.
the number of lone pairs of electrons.
the number of bond pairs of electrons
The stereostructure of both ………...…... is linear
BF3 and NH3
H2O and SO2
BeF2 and CO2
The arrangement of the electron pairs on the central atom is being similar to the stereostructure of the molecule when …………
The central atom does not contain any lone pairs of electrons
The molecule obeys the octet rule
The value of (n) is less than 4.
The value of (m) is higher than 0.
which of the following scenarios is an ionic substance conductive?
when it is molten
when it contains a mixture of different ions
when it is freshly made
When it is broken into very small pieces
Which anion-cation pair would produce the strongest ionic bond?
I- and Li +
F- and Li +
F- and Rb +
The forces between ions in ionic structures are generally very strong. Which physical properties would you expect to be high as a result?
Elasticity and flexibility
Melting and boiling points
Conductivity and solubility
Which of the following, at room temperature and pressure, is an example of an ionic solid?
Hydrogen chloride
Barium chloride
Carbon dioxide
Which of the following is a pair of elements that can form an ionic bond?
Na and I
I and I
H and I
If the total number of both the lone and the bond pairs of electrons found in the orbitals of the central atom of a covalent molecule is 4, then the stereostructure of this molecule might be
linear, angular or planar triangle
angular, tetrahedron or linear.
tetrahedron, angular or three-base pyramid.
three-base pyramid, planar triangle or angular
