نفرت انگیز توانائی ہمیشہ ہے؟
A. Could be either positive or negative depending on the conditions
B. None of these
C. Negative
D. Positive
Explanation
The repulsive energy between particles is always positive .
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مندرجہ ذیل میں سے کون سا گیسوں کے کائنےٹک مالیکیولر تھیوری کا مرجع نہیں ہے؟
A. Collisions of gas molecules are elastic
B. Do not exert the same pressure in all directions
C. In gases there is a predominance of intermolecular energy
D. All molecules have same speed at different temperatures
Explanation
The postulate that " Collisions of gas molecules are elastic " is not a part of the Kinetic Molecular Theory of Gases.
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A. Square planar
B. Trigonal planar
C. Octahedral
D. Tetrahedral
Explanation
Tetrahedral geometry: This means the central carbon atom is surrounded by four atoms (three hydrogen atoms and one chlorine atom ) arranged in a three-dimensional pyramid shape.
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مندرجہ ذیل میں سے کون سا قطبی انو ہے؟
A. Ethane
B. Carbon dioxide
C. Methanol
D. None of these
Explanation
Methanol (CH₃OH) is polar due to the presence of the highly electronegative –OH group and its bent geometry.
Other molecules like CO₂ and CCl₄ are non-polar because of their symmetrical shape, despite having polar bonds.
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ٹرپل بانڈ _____ میں موجود ہے؟
A. Cl2
B. N2
C. None of these
D. F2
Explanation
Nitrogen gas (N₂) has a triple covalent bond between the two nitrogen atoms.
This triple bond makes N₂ very stable and unreactive under normal conditions.
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مندرجہ ذیل میں سے کون سا سب سے کمزور انٹرا سیلولر قوت ہے؟
A. Dipole dipole force
B. None of these
C. Dipole induced diploe force
D. Ion diploe force
Explanation
Dipole-induced dipole force is the weakest among intermolecular forces, caused when a polar molecule induces a dipole in a nonpolar molecule .
It is weaker than dipole-dipole and ion-dipole interactions .
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کس کے بڑے پیمانے کے مقابلے میں کسی عنصر کے ایٹم کا بڑے پیمانے پر متعلقہ جوہری ماس ہے؟
A. None of these
B. Hydrogen
C. Oxygen
D. Carbon
Explanation
Relative atomic mass is measured by comparing an atom's mass to 1/12th the mass of a carbon-12 atom .
Carbon-12 is the standard reference in modern atomic mass scale.
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A. 0.50
B. 0.25
C. 1.50
D. None of these
Explanation
Step 1: Calculate moles of oxygen 8.0 g O / 16 g/mol = 0.5 mol O
Step 2: Calculate moles of CO₂
Since CO₂ has 2 O atoms, moles of CO₂ = 0.5 mol O / 2 = 0.25 mol CO₂
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A. 2-Methylheptane
B. 2,2,4-Trimethylpentane
C. 3,3-Dimethylhexane
D. 4-Ethyl-2-methylhexane
Explanation
The IUPAC name of iso-octane is 2,2,4-trimethylpentane.
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A. Three H atoms
B. No H atom
C. Two H atoms
D. One H atom
Explanation
In t-butyl alcohol, the tertiary carbon is bonded to no hydrogen atoms.
A tertiary carbon is bonded to three other carbon atoms.
In t-butyl alcohol, the carbon with the OH group (the tertiary carbon
It is surrounded by three methyl groups, leaving no space for any hydrogen atoms to be attached directly to it.
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