EVERYDAY SCIENCE
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
درج ذیل میں سے کون سا عمل بینزین کا الیکٹروفیلک متبادل تعامل نہیں ہے؟
- Hydrogenation
- Halogenations
- Nitration
- Sulphonation
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Explanation
- Hydrogenation is an addition reaction in which hydrogen converts benzene into cyclohexane under suitable conditions.
- Benzene commonly undergoes electrophilic substitution reactions in which a hydrogen atom is replaced by an electrophile.
- Halogenation: A hydrogen atom is replaced by chlorine or bromine.
- Nitration: A nitro group (–NO₂) is introduced into the benzene ring.
- Sulphonation: A sulphonic acid group (–SO₃H) is introduced.
Last verified on 02-11-2026
مائعات کی چپچپاہٹ کن عوامل پر منحصر ہوتی ہے؟
- Shape of molecule
- Temperature
- Size of molecule
- All of these
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Explanation
- Molecular shape: Long or irregular molecules generally have greater viscosity due to stronger intermolecular interactions and entanglement.
- Temperature: The viscosity of liquids generally decreases when temperature increases.
- Molecular size: Larger molecules often have greater viscosity because of stronger intermolecular forces and greater resistance to flow.
- Therefore, molecular shape, temperature and molecular size all affect the viscosity of liquids.
Last verified on 02-11-2026
لکڑی کی تباہ کن کشید سے حاصل ہونے والے پائرولِگنیئس ایسڈ میں کون سے مادے شامل ہوتے ہیں؟
- Acetone, acetic acid, methyl acetate, methanol
- Methanol, acetone, formaldehyde, acetic acid
- Ethanol, acetic acid, phenol, formaldehyde
- None of these
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Explanation
- Pyroligneous acid is a complex liquid obtained by the destructive distillation of wood in the absence of air.
- Its major components include acetic acid, methanol, acetone and other organic compounds.
- It is also known as wood vinegar.
- Methanol obtained from wood distillation was historically called wood alcohol.
Last verified on 02-11-2026
ایتھائل ایسیٹیٹ کس پھل کا ذائقہ پیدا کرنے کے لیے استعمال ہوتا ہے؟
- Banana
- Strawberry
- Pine apple
- None of these
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Explanation
- Ethyl acetate (CH₃COOC₂H₅) is an ester with a sweet, fruity smell.
- It is used as a flavouring agent in food products and beverages.
- It is commonly associated with pineapple-like fruity flavour.
- It is also widely used as an industrial solvent.
Last verified on 02-11-2026
سوڈیم ایسیٹیٹ کی ڈی کاربوکسیلیشن سے کیا پیدا ہوتا ہے؟
- Ethane
- Methane
- Acetic acid
- None of these
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Explanation
- Sodium acetate (CH₃COONa) undergoes decarboxylation when heated with soda lime (NaOH + CaO).
- The carboxyl group (–COO⁻) is removed, producing methane (CH₄).
- The reaction gives an alkane containing one carbon atom fewer than the original carboxylate salt.
Last verified on 02-11-2026
جسم کے اندرونی حالات کو مناسب طریقے سے برقرار رکھنے اور منظم کرنے کے عمل کو کیا کہتے ہیں؟
- Excretion
- Homeostasis
- Osmoregulation
- None of these
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Explanation
- Homeostasis is the process of maintaining a stable internal environment in the body despite external changes.
- It regulates body temperature, blood glucose levels, water balance, and pH.
- The human body maintains an average temperature of approximately 37°C (98.6°F).
- The nervous and endocrine systems play important roles in maintaining homeostasis.
Last verified on 02-11-2026
گلیشیئل ایسیٹک ایسڈ کیا ہے؟
- Anhydrous acetic acid
- Acetic anhydride
- Aqueous acetic
- None of these
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Explanation
- Glacial acetic acid is nearly pure, water-free acetic acid (CH₃COOH).
- It is called “glacial” because it freezes at approximately 16.6°C, forming ice-like crystals.
- Ordinary vinegar is a dilute aqueous solution of acetic acid, usually containing about 4–8% acetic acid.
- Acetic anhydride is a different chemical compound.
Last verified on 02-11-2026
ٹولن ٹیسٹ کو کس دوسرے نام سے جانا جاتا ہے؟
- Iodoform test
- Fehling's test
- Silver mirror test
- None of these
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Explanation
- Tollens' test is also called the silver mirror test.
- It is used to identify aldehydes because they reduce silver ions (Ag⁺) to metallic silver.
- A shiny silver coating forms on the inner surface of the test tube.
- The reagent contains ammoniacal silver nitrate, known as Tollens' reagent.
Last verified on 02-11-2026
کینیزارو کا تعامل کیا کہلاتا ہے؟
- Self-Redox reaction
- Addition reaction
- Redox reaction
- None of these
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Explanation
- Cannizzaro reaction is a self-oxidation-reduction (disproportionation) reaction.
- It occurs in aldehydes that do not contain an alpha-hydrogen atom, in the presence of a concentrated alkali.
- One aldehyde molecule is oxidized into a carboxylate salt, while another is reduced into an alcohol.
- Example: Benzaldehyde produces benzyl alcohol and sodium benzoate with concentrated NaOH.
Last verified on 02-11-2026
ایتھائل الکوحل کو آکسیڈائزنگ مکسچر پوٹاشیم ڈائیکرومیٹ اور مرتکز سلفیورک ایسڈ کے ذریعے مکمل آکسیڈائز کرنے سے کیا بنتا ہے؟
- Acetic acid
- Formic acid
- Acetaldehyde
- None of these
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Explanation
- Ethyl alcohol (ethanol, C₂H₅OH) undergoes oxidation to form acetic acid (CH₃COOH).
- Potassium dichromate in acidic medium acts as a strong oxidizing agent.
- Acetaldehyde is an intermediate product during the oxidation of ethanol to acetic acid.
- Complete oxidation under suitable conditions produces acetic acid.
Last verified on 02-11-2026
