FPSC LECTURER CHEMISTRY PAST PAPER 08-08-2024
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dxy
dz2
dx2 -y2
None of these
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Explanation
dsp2 type of hybridization is seen especially in the case of transition metal ions.
The orbitals involved in this type of hybridization are dx2−y2, s and two p orbitals
Hybridization
Molecular Orbital Theory (MOT)
Resonance
None of these
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Explanation
O₂ (oxygen molecule) is paramagnetic because it has unpaired electrons in its molecular orbitals.
According to Molecular Orbital Theory (MOT), the electronic configuration of O₂ reveals
There are two unpaired electrons in the π* anti-bonding orbitals, which are responsible for its paramagnetic properties.
Hybridization and resonance do not directly explain the presence of unpaired electrons in this context.
Isotones
Isobars
Isotopes
None of these
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Explanation
Isotones are elements or isotopes that have the same number o f neutrons but different numbers of protons.
For example,
14N and 15 O are isotones because they both have 7 neutrons, but different numbers of protons.
Carbon
Fluorine
Neon
None of these
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Explanation
Rate of reaction is proportional to the square of the concentration
In which rate of reaction is equal to rate constant
Rate of reaction is dependent of only one molecule
None of these
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Explanation
In a zero-order reaction, the rate of reaction is independent of the concentration of the reactants.
The rate of the reaction is equal to the rate constant 𝑘
Octahedral
Pentagonal Biplanar
Square planer
None of these
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Explanation
Iodine heptafluoride (IF₇) has a pentagonal bipyramidal structure.
In this geometry, iodine is surrounded by seven fluorine atoms:
five fluorines are arranged in a plane forming a pentagon, and the other two fluorines are positioned above and below this plane, forming the axial positions.
This arrangement minimizes electron pair repulsion around the iodine atom.
PHRV
PAN
PTFE
None of these
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Explanation
PHRV (Polyhydroxyalkanoates) is a type o f biodegradable polymer.
It is produced by microorganisms and can be broken down by natural processes, making it environmentally friendly compared to other polymers.
B₃H₆N₃
B₃H₃N₃
BH₃N₃
None of these
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Explanation
Borazine, also known as borazole, has the chemical formula B₃H₆N₃.
It is a compound that resembles benzene in structure but with alternating boron and nitrogen atoms in the ring, along with hydrogen atoms.
Change in internal energy is zero
Temperature is increasing
Volume is constant
None of these
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Explanation
In an isothermal process, the temperature of the system remains constant.
According to the first law of thermodynamics, for an ideal gas, if the temperature is constant, the internal energy does not change.
Therefore, the change in internal energy is zero (ΔU = 0).
Temperature
Volume
Pressure
None of these
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Explanation
Internal energy is primarily a function of temperature.
For a given substance, internal energy (U) is related to the temperature of the system, as it r eflects the kinetic and potential energy of the molecules.