100 MOST REPEATED MCQS OF EDS PDF
Top most repeated 100 EDS MCQs.
یاد رکھیں گیس پیپر کو پی ڈی ایف میں ڈنلوڈ کرنے
سےبہترہے، یہاں ویب سائیٹ سے وضاحت کے ساتھ پڑھیں۔ کیونکہ ان سوالات کے
متعلق ہی بار بار سوالات بعض اوقات پیپرمیں پوچھے جاتے ہیں اوراس کے علاوہ
ویب سائیٹ پر آئے روز پیپرز کے مطابق نیو سوالات بھی ایڈ کیے جاتے ہیں ۔ اس
لیے وضاحت کے ساتھ پڑھنے سے اپکی تیاری انشا اللہ اچھی ہو جائے گی۔
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
Equal to rate constant
Greater than rate constant
Less than rate constant
None of these
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Explanation
For a first-order reaction, rate r = k[A]. If [A] = 1 M , then rate = k × 1 = k , so the rate equals the rate constant .
An aqueous solution of sucrose
An aqueous solution of table salt
An aqueous solution of fructose
A solution of kerosene
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Explanation
An equilibrium constant expression can be applied to an aqueous solution of table salt.
An equilibrium constant expression is used for reversible reactions where the concentrations of reactants and products reach a constant state.
Table salt (sodium chloride) dissociates into Na+ and Cl- ions in water, and this dissociation can be considered a reversible reaction. Thus, the equilibrium constant can be applied to this system.
Has constant pH
Resist change in its pH
Consists of a strong acid and a strong base
Contains salts of strong acids and strong bases
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Explanation
A buffer is a solution that resists change in its pH.
A buffer solution is composed of a weak acid and its conjugate base (or a weak base and its conjugate acid).
When a small amount of a strong acid or base is added to a buffer,
The added ions react with the components of the buffer to maintain a relatively constant pH.
The forward reaction increases
Both forward and reverse reaction remains unaffected
The reverse reaction decreases
The forward reaction decreases
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Explanation
If one mole of gaseous hydrogen is mixed with one mole of gaseous iodine in an empty container, then with time, the forward reaction decreases
Because as the reaction proceeds, the concentration of hydrogen and iodine decreases, leading to a slower rate of forward reaction, while the reverse reaction starts to increase until equilibrium is reached.
Axis of rotation
Plane of symmetry
Center of symmetry
Axis of Inversion
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Explanation
The proper term for "X" is Plane of symmetry.
A plane of symmetry is an imaginary plane that divides a crystal into two halves, where each half is the mirror image of the other.
مندرجہ ذیل میں سے سبھی کوولینٹ نیٹ ورک کے کرسٹل ہیں سوائے اس کے؟
SiO2
Graphite
S8
Diamond
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Explanation
SiO₂, Graphite, and Diamond have covalent network structures, where atoms are bonded in a continuous network. S₈ is a molecular crystal , consisting of discrete S₈ molecules held together by weak Van der Waals forces.
وہ کرسٹل جن میں جالی کے نقطوں پر دھاتی آئنوں کا قبضہ ہوتا ہے؟
Ionic crystals
Covalent crystals
Molecular crystals
Metallic crystals
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Explanation
Crystals in which lattice points are occupied by metal ions are a) Ionic crystals.
Ionic crystals are formed by the electrostatic attraction between positively charged metal cations and negatively charged anions.
These ions are arranged in a regular lattice structure.
مندرجہ ذیل تمام مائع کرسٹل ہیں سوائے؟
Soap solution
DNA
Cholesteryl format
Engine oil
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Explanation
A liquid crystal is a state of matter that exhibits properties of both liquids and crystals.
It requires the molecules to have a specific structure, often long and rigid, to form ordered phases .
While soap can form structures similar to liquid crystals when mixed with water (forming micelles), pure soap is not a liquid crystal.
The other options listed, DNA, cholesteryl format, and engine oil, can all exhibit liquid crystal properties under certain conditions.
Dipole-dipole forces
Dispersion forces
Hydrogen bonding
Dipole-dipole forces and dispersion forces
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Explanation
Methylamine and hydrogen peroxide are liquids due to Hydrogen bonding.
Hydrogen bonding is a strong type of intermolecular force
That occurs when a hydrogen atom is bonded to a highly electronegative atom
Like oxygen, nitrogen, or fluorine. In methylamine (CH3NH2)
The nitrogen atom has a lone pair of electrons and can form hydrogen bonds with other methylamine molecules.
Similarly, hydrogen peroxide (H2O2) has hydrogen atoms bonded to oxygen atoms, allowing for hydrogen bonding.
These strong hydrogen bonds hold th e molecules together in the liquid state.
He
H2
N2
CO2
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Explanation
According to Graham’s Law of Diffusion, gases with lower molar mass diffuse faster.
Molar masses:
- H₂ = 2 g/mol (lowest)
- He = 4 g/mol
- N₂ = 28 g/mol
- CO₂ = 44 g/mol
Since H₂ has the smallest molar mass, it will diffuse the fastest and thus escape in the least time.
