Your progress 0/40 answered
· 0 correct
(0%)
Set complete — review the explanations below, then reset and run it again for retention.
Q1 of 40
The IUPAC name of CH₃OCH₂CH₃ is:
Correct Answer: Option B — Methoxyethane Detailed Academic Explanation: Alkoxyalkane naming: smaller group as alkoxy substituent ⇒ methoxyethane.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q2 of 40
Williamson synthesis is used to prepare:
Correct Answer: Option B — Ethers Detailed Academic Explanation: Williamson synthesis: R-O⁻Na⁺ + R'-X → R-O-R' + NaX (SN2 reaction for ether preparation).
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q3 of 40
The compound that does NOT give iodoform test is:
Correct Answer: Option D — CH₃CH₂CHO Detailed Academic Explanation: CH₃CH₂CHO (propanal) lacks CH₃CO- or CH₃CH(OH)- group; other three give positive iodoform test.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q4 of 40
The compound used in silvering of mirrors is:
Correct Answer: Option A — Formaldehyde Detailed Academic Explanation: Tollens' test with formaldehyde gives uniform silver mirror: HCHO + 2[Ag(NH₃)₂]⁺ + 3OH⁻ → HCOO⁻ + 2Ag↓ + 4NH₃ + 2H₂O.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q5 of 40
The compound that decolorizes bromine water is:
Correct Answer: Option B — Ethene Detailed Academic Explanation: Ethene undergoes electrophilic addition with Br₂: CH₂=CH₂ + Br₂ → CH₂BrCH₂Br, decolorizing reddish-brown bromine water.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q6 of 40
The main cause of Minamata disease is pollution by:
Correct Answer: Option B — Mercury Detailed Academic Explanation: Minamata disease caused by methylmercury poisoning from industrial wastewater contaminating fish/shellfish.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q7 of 40
Itai-itai disease is caused by pollution with:
Correct Answer: Option C — Cadmium Detailed Academic Explanation: Itai-itai ('ouch-ouch') disease caused by cadmium poisoning from mining operations contaminating rice paddies in Japan.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q8 of 40
Blue baby syndrome is caused by excess of ________ in drinking water.
Correct Answer: Option C — Nitrates Detailed Academic Explanation: High nitrate levels (>10 ppm) cause methemoglobinemia in infants, reducing blood's oxygen-carrying capacity ('blue baby syndrome').
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q9 of 40
The permissible limit of fluoride in drinking water is:
Correct Answer: Option C — 1.5 ppm Detailed Academic Explanation: WHO guideline: 1.5 mg/L (ppm) maximum; optimal for dental health is 0.5-1.0 ppm. Excess causes dental/skeletal fluorosis.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q10 of 40
The process of removing suspended impurities from water using alum is called:
Correct Answer: Option C — Coagulation Detailed Academic Explanation: Alum [KAl(SO₄)₂·12H₂O] hydrolyzes to form Al(OH)₃ flocs that trap suspended particles (coagulation/flocculation).
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q11 of 40
The main component of LPG is:
Correct Answer: Option C — Propane and butane Detailed Academic Explanation: Liquefied Petroleum Gas (LPG) contains mainly propane (C₃H₈) and butane (C₄H₁₀).
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q12 of 40
The compound responsible for characteristic smell of garlic is:
Correct Answer: Option A — Allicin Detailed Academic Explanation: Allicin (diallyl thiosulfinate) formed when garlic is crushed gives pungent odor and has antimicrobial properties.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q13 of 40
The alkaloid present in tea is:
Correct Answer: Option B — Caffeine Detailed Academic Explanation: Tea leaves contain 2-5% caffeine (1,3,7-trimethylxanthine), a central nervous system stimulant.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q14 of 40
Hydrolysis of amides gives:
Correct Answer: Option B — Carboxylic acids and amines Detailed Academic Explanation: Acidic hydrolysis: RCONH₂ + H₂O + H⁺ → RCOOH + NH₄⁺; basic hydrolysis: RCONH₂ + OH⁻ → RCOO⁻ + NH₃.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q15 of 40
The compound used as tranquilizer is:
Correct Answer: Option A — Valium Detailed Academic Explanation: Valium (diazepam) is benzodiazepine used as anxiolytic/sedative. Morphine, heroin are opioids (analgesics); cocaine is stimulant.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q16 of 40
The main constituent of coal gas is:
Correct Answer: Option B — Hydrogen Detailed Academic Explanation: Coal gas (from destructive distillation of coal) contains ~50% H₂, 35% CH₄, 10% CO, and other gases.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q17 of 40
The main component of natural rubber is:
Correct Answer: Option A — Polyisoprene Detailed Academic Explanation: Natural rubber is cis-1,4-polyisoprene obtained from latex of Hevea brasiliensis tree.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q18 of 40
The synthetic rubber used in automobile tires is:
Correct Answer: Option B — Buna-S Detailed Academic Explanation: Buna-S (styrene-butadiene rubber, SBR) is most widely used synthetic rubber for tire treads due to good abrasion resistance.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q19 of 40
The fiber used in making ropes is:
Correct Answer: Option A — Nylon Detailed Academic Explanation: Nylon has high tensile strength and elasticity, making it suitable for ropes, fishing nets, and parachutes.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q20 of 40
The compound that is greenhouse gas is:
Correct Answer: Option C — Carbon dioxide Detailed Academic Explanation: CO₂ absorbs infrared radiation, contributing significantly to global warming. Other GHGs: CH₄, N₂O, CFCs, H₂O vapor.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q21 of 40
The compound that depletes ozone layer is:
Correct Answer: Option C — CFCs Detailed Academic Explanation: CFCs release chlorine radicals in stratosphere that catalytically destroy ozone molecules.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q22 of 40
The compound used in water softening is:
Correct Answer: Option B — Na₂CO₃ Detailed Academic Explanation: Washing soda (Na₂CO₃) precipitates Ca²⁺/Mg²⁺ ions causing hardness: Ca²⁺ + CO₃²⁻ → CaCO₃↓.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q23 of 40
The compound that causes fluorosis is:
Correct Answer: Option A — Excess fluoride Detailed Academic Explanation: Excess fluoride (>1.5 ppm) in drinking water causes dental fluorosis (mottling of teeth) and skeletal fluorosis.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q24 of 40
The compound used as antiknock agent in gasoline is:
Correct Answer: Option D — All of the above Detailed Academic Explanation: Tetraethyl lead [Pb(C₂H₅)₄] was historically used; now replaced by oxygenates like ethanol and MTBE due to lead toxicity.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q25 of 40
The compound that is nerve gas is:
Correct Answer: Option B — Sarin Detailed Academic Explanation: Sarin (GB) is organophosphate nerve agent inhibiting acetylcholinesterase, causing uncontrolled nerve signaling.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q26 of 40
The compound used in chemotherapy is:
Correct Answer: Option A — Cisplatin Detailed Academic Explanation: Cisplatin [Pt(NH₃)₂Cl₂] is platinum complex used as anticancer drug, particularly for testicular and ovarian cancers.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q27 of 40
The compound that is antibiotic is:
Correct Answer: Option A — Penicillin Detailed Academic Explanation: Penicillin (from Penicillium fungus) inhibits bacterial cell wall synthesis; first widely used antibiotic.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q28 of 40
The compound that is analgesic is:
Correct Answer: Option C — Both A and B Detailed Academic Explanation: Both aspirin (non-narcotic) and morphine (narcotic) relieve pain; morphine also induces euphoria and is addictive.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q29 of 40
The compound that is antipyretic is:
Correct Answer: Option C — Both A and B Detailed Academic Explanation: Both aspirin and paracetamol reduce fever (antipyretic action) in addition to pain relief (analgesic action).
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q30 of 40
The compound that is tranquilizer is:
Correct Answer: Option C — Both A and B Detailed Academic Explanation: Both Valium (diazepam) and Librium (chlordiazepoxide) are benzodiazepines used as anxiolytics/sedatives.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q31 of 40
The compound that is narcotic analgesic is:
Correct Answer: Option D — All of the above Detailed Academic Explanation: All are opioids derived from opium poppy (Papaver somniferum) acting on CNS to relieve pain and induce euphoria; highly addictive.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q32 of 40
The compound that is stimulant is:
Correct Answer: Option D — All of the above Detailed Academic Explanation: Caffeine (coffee/tea), nicotine (tobacco), and cocaine (coca leaves) all stimulate CNS, increasing alertness and heart rate.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q33 of 40
The compound that is depressant is:
Correct Answer: Option D — All of the above Detailed Academic Explanation: All depress CNS activity, causing sedation, reduced anxiety, and at high doses respiratory depression.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q34 of 40
The compound used as artificial sweetener is:
Correct Answer: Option D — All of the above Detailed Academic Explanation: All are non-nutritive sweeteners much sweeter than sucrose, used in 'diet' foods/beverages.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q35 of 40
The compound that is food preservative is:
Correct Answer: Option C — Both A and B Detailed Academic Explanation: Sodium benzoate inhibits fungi/yeast; sulfites prevent browning and microbial growth in foods/beverages.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q36 of 40
The compound that is antioxidant is:
Correct Answer: Option D — All of the above Detailed Academic Explanation: Butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), and tocopherols (vitamin E) prevent oxidative rancidity in fats/oils.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q37 of 40
The compound that is emulsifier is:
Correct Answer: Option C — Both A and B Detailed Academic Explanation: Emulsifiers have both hydrophilic and hydrophobic parts, stabilizing mixtures of immiscible liquids (e.g., oil and water in mayonnaise).
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q38 of 40
The compound that causes Minamata disease is:
Correct Answer: Option A — Methylmercury Detailed Academic Explanation: Methylmercury bioaccumulates in fish; consumption causes neurological damage (Minamata disease).
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q39 of 40
The compound that causes Itai-itai disease is:
Correct Answer: Option B — Cadmium Detailed Academic Explanation: Cadmium accumulates in kidneys/bones causing severe pain and fractures (Itai-itai disease).
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice
Q40 of 40
The compound that causes blue baby syndrome is:
Correct Answer: Option A — Nitrates Detailed Academic Explanation: Nitrates convert hemoglobin to methemoglobin, reducing oxygen-carrying capacity in infants.
💡 Key Conceptual Anchor:
Chemistry — Mixed Practice