SPSC 25 YEARS PAST PAPERS 2001 TO 2026
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
پرنسپل کوانٹم نمبر طے کرتا ہے کہ نیوکلئس سے کتنا دور _______ پایا جانا ہے۔
Electron
Proton
Neutron
None of these
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Explanation
The principal quantum number (n n determines the energy level and the average distance of an electron from the nucleus in an atom. A higher n n indicates that the electron is found farther from the nucleus.
12000 years
6000 years
9000 years
None of these
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Explanation
If the radioactivity is half of that in fresh wood , the time elapsed is equal to one half-life of C-14, which is 6000 years .
Therefore, the tomb is approximately 6000 years old.
نان اسٹوچومیٹرک کمپاؤنڈ کی ایک مثال ______ ہے؟
Pbo
NiO2
Fe2O4
None of these
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Explanation
Nonstoichiometric compounds have compositions that do not follow simple whole-number ratios of atoms. Fe₂O₄ is an example because it can exist in varying compositions, deviating from the ideal stoichiometric formula.
پوٹاشیم کوبالٹینیٹریٹ کا کیمیائی فارمولا ______ ہے؟
K [Co(NO3)6]
K3[Co(NO2)6]
K3[Co(NO2)3]
None of these
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Explanation
Potassium cobaltinitrite is a coordination compound where cobalt is complexed with six nitrite (N O 2 NO_2 The correct formula reflects three potassium ions (K + K⁺ [ C o ( N O 2 ) 6 ] 3 − [Co(NO_2)_6]^{3-}
ایتھیلین کا اعلی پولیمر ______ کے نام سے جانا جاتا ہے؟
Tetralene
Polythene
Tyrene
None of these
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Explanation
Ethylene (C 2 H 4 C_2H_4 Polyethylene (Polythene). It is widely used in plastic bags, containers, and packaging materials.
Hybridization
Crystal Field Theory
Ligand Field Theory
None of these
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Explanation
In CH₄ (methane), the observed bond angles are 109.5°, which cannot be explained by pure p orbitals (which would give 90° angles). The concept of sp³ hybridization explains the tetrahedral geometry and 109.5° bond angles.
جب ایک دوسرے پر دو کیوب دبائے جاتے ہیں تو وہ ایک مکعب بنانے کے لئے متحد ہوجاتے ہیں۔ مندرجہ ذیل میں سے کون سی قوت ان کو ایک ساتھ رکھنے کی ذمہ دار ہے؟
Hydrogen bond formation
Covalent attraction
Vander Wall's forces
None of these
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Explanation
When two cubes are pressed together, Van der Waals forces (weak intermolecular forces) help them stick. These forces arise due to temporary dipoles and dispersion forces between molecules.
When the temperature is high and pressure is low
When the temperature is low
When both the temperature and pressure are low
None of these
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Explanation
A real gas behaves like an ideal gas at high temperature (molecules have enough kinetic energy to overcome intermolecular forces) and low pressure (molecules are far apart, reducing interactions). Under these conditions, the gas follows the ideal gas equation P V = n R T PV = nRT .
وہ کمپلیکس جن میں تین سے کم ڈی الیکٹران ہوتے ہیں وہ _____ ہیں؟
Labile
Unstable
Inert
None of these
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Explanation
Complexes with fewer than three d-electrons tend to be labile . It means they undergo fast ligand exchange reactions. This is because they experience weaker crystal field stabilization and lower energy barriers for bond rearrangement.
Hybridization
M.O theory
VSEPR theory
None of these
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Explanation
BF₃ has a trigonal planar geometry with 120° bond angles, which cannot be explained by pure p orbitals (90°) . The concept of sp² hybridization explains the observed bond angles by mixing one s and two p orbitals.
