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WorksheetsPRE UPS 3: CHEMISTRY DK014
Total questions: 20
Worksheet time: 10mins
Which of the following statements is correct regarding the elements in the same period in the Periodic Table?
They have the same number of valence electrons
They have the same size
They have the same number of filled electronic shells
They have the same nucleon number
Element X have the electronic configuration of:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3
Determine the period, group and block for element X.
Period 4, Group 12, d - block
Period 4, Group 15, p - block
Period 4, Group 13, p - block
Period 4, Group 12, p - block
The electronegativity of chlorine, Cl is the highest compare to other elements in Period 3. Why?
Cl is the largest and has the greatest effective nuclear charge
Cl is the largest and has the lowest effective nuclear charge
Cl is the smallest and has the lowest effective nuclear charge
Cl is the smallest and has the greatest effective nuclear charge
What makes a valence electron more attracted to the nucleus?
Less distance between the nucleus and having less protons
Less distance between the nucleus and having more protons
Less distance and having more valence electrons
More distance between the nucleus and having more protons
Which of the following species have greater radius, P or P3- ? Why ?
P3- because it gains an energy level
P3- due to extra electron repulsion
P because it loses an energy level
P because of extra electron repulsion
Element Z has more protons than element Y, but both have 4 energy levels. Which statement is true?
Y is smaller and have higher electronegativity
Y is bigger and have higher electronegativity
Z is smaller and have higher electronegativity
Z is bigger and have higher electronegativity
An ionic bond is most likely to be formed between
Atoms with similar ionisation energy
Atoms in the same period of the periodic table
Atoms with a large difference in electronegativity
Atoms of a metallic element and atoms of a non-metallic elements
How many electrons are shared between two atoms joined together by a double bond?
2
4
6
8
Choose the correct Lewis dot symbol for carbon.
A covalent molecule XY6 has no lone pair electrons on its central atom and each atom in the molecule have a formal charge = 0. Its shape is most likely to be
Tetrahedral
Octahedral
Trigonal Bypyramidal
Trigonal pyramidal
Elements A and E have two and seven valence electrons respectively. The most likely formula of the compound formed between A and E is
A2E
AE2
A2E2
A2E7
Which of the following molecule would be linear?
H2O
AlCl3
SO2
NO-
Which of the following has an unpaired electron in it central atom?
NO2+
BCl3
NO
PH3
Which of the following is/are non polar molecule with polar bonds?
H2
CH4 and PCl5
SF6 and AlCl3
CH3Cl and CCl4
HCN molecule has
Non polar bonds and Non polar molecules
Polar bonds and is a polar molecule
Polar bonds but is a non polar molecules
Non polar bonds but a polar molecule
The Lewis structure of SOCl2 is given as above. The formal charges on Sulphur, Chlorine and Oxygen are
S: -1 , Cl: +2, : -1
S: 0, Cl: 0, O: 0
S: +2, Cl: -1, O: -1
S: +2, Cl: -2, O: 0
Which of the following can form intermolecular Hydrogen bond with water.
CH3Cl
CH3COCH3
CH3COOH
CH3F
Why hydrochloric acid, HCl can form dipole - dipole interaction between its molecules?
Due to the presence of instantaneous dipole in HCl molecule
HCl has net dipole moment, μ > 0
HCl is made up of two different elements.
The electrons density in HCl molecule are symmetrically distributed between two atoms
Which of the following molecules does not have a permanent dipole moment?
SO3
HCN
HCl
CH3Cl
Which of the following species contains three bond pairs and one lone pair around the central atom?
NH2-
PCl3
H2O
BF3
