SPSC CHEMISTRY 25 YEARS PAST PAPERS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
مندرجہ ذیل میں سے کون سا کمپاؤنڈ نامیاتی مرکب نہیں سمجھا جاتا ہے؟
- Benzene
- Methane
- Carbon dioxide
- None of these
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Explanation
Organic compounds contain carbon and hydrogen bonds.But carbon dioxide (CO₂) lacks hydrogen, making it inorganic.CO₂ is classified as an inorganic carbon compound, like carbonates and carbides.
پیشاب میں گلوکوز کی موجودگی کا پتہ ______ کے ذریعہ کیا جاسکتا ہے؟
- Tollen's test
- Lucas test
- Fehling's test
- None of these
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Explanation
Fehling's test detects the presence of reducing sugars, like glucose, in urine.The test involves Fehling's solution, which changes color when it reacts with glucose, indicating its presence.
مندرجہ ذیل میں سے کون سا گیس مائع پر کمپریشن پر پھٹتا ہے؟
- Ethyne
- Ethane
- Methane
- None of these
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Explanation
Ethyne (acetylene) is highly reactive and can explode under pressure when compressed to a liquid form.This behavior is due to the instability of acetylene at high pressure, which leads to decomposition.
کلوروہائڈرین کا فارمولا ______ ہے؟
- C(OH)3 - C(OH)2Cl
- CH(Cl)2 - CH(OH)(Cl)
- HO-CH2-CH(OH)(Cl)
- None of these
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Explanation
Chlorohydrin has a hydroxyl group (-OH) and a chlorine atom (Cl) attached to adjacent carbon atoms.The correct formula represents a hydroxyl group on the first carbon and a hydroxyl-chlorine substitution on the second carbon.
کوئلے کی گیس بنیادی طور پر ______ پر مشتمل ہے؟
- Hydrogen and oxygen
- Methane and hydrogen
- Ethane and hydrogen
- None of these
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Explanation
Coal gas primarily consists of methane (CH₄) and hydrogen (H₂), along with small amounts of other gases.It is produced during the destructive distillation of coal, where methane and hydrogen are key components.
کی وجہ سے میتھین پانی میں قدرے گھلنشیل ہے؟ _____
- Ionic nature
- Polar nature
- Non-polar nature
- None of these
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Explanation
Methane is non-polar, which reduces its solubility in water, a polar solvent.Despite its non-polarity, methane's slight solubility is due to weak London dispersion forces between molecules.
مشابہت اور خالص ہیرے کے درمیان فرق کرنے کے لئے کون سی تکنیک استعمال کی جاتی ہے؟
- Microscope
- X-ray
- Refractive index
- None of these
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Explanation
Pure diamonds have a high refractive index (~2.42), which differs from imitation diamonds.Measuring the refractive index helps distinguish real diamonds from synthetic or fake ones.
گلیشیئل ایسٹک ایسڈ _____ کے ساتھ غلط ہے؟
- Ether
- Water
- Alcohol
- All of these
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Explanation
Glacial acetic acid is highly polar and forms hydrogen bonds.This making it miscible with water, alcohol, and ether.Its solubility in both polar and nonpolar solvents allows it to mix with a wide range of liquids.
خلائی راکٹ ایندھن کا استعمال کرتے ہیں جو مائع آکسیجن مائع کے ساتھ ملا ہوا ہے؟
- Helium
- Hydrogen
- Nitrogen
- None of these
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Explanation
Space rockets use liquid hydrogen (LH₂) as fuel, combined with liquid oxygen (LOX) as an oxidizer for efficient combustion.This combination provides high thrust and energy efficiency, making it ideal for rocket propulsion.
آکسائم _____ کے نام سے بھی جانا جاتا ہے؟
- Cyanohydrin
- Formaldehyde amine
- Acetaldehyde amine
- None of these
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Explanation
Oximes are chemical compounds derived from aldehydes or ketones by reaction with hydroxylamine.They are also referred to as Formaldehyde amine due to their structural similarity.
