Waec Chemistry Updated on Nov 22, 2020 by FlashisaacNov 22, 2020 Welcome to Flashlearners Chemistry Quiz... Read Each Question Carefully And Choose The Best Answer From The Options. You May Click Here for Free Video Tutorials To Boost Your Score Or Simply Click Here To Access Thousands of Chemistry Questions Offline. Next To Begin...1. When sodium dioxonitrate (111) (HaNO2\) dissolves isExothermicEndothermicIsothermicIsomeric2. The flame used by welders in cotton metals isbutane gas flameacetylene flamekerosene flameoxy-acetylene flame3. The three-dimensional shape of methane ishexagonaltrigonallineartertrahedral4. Consecutive members of an alkane homologous series differ byCHCH2CH3CnHn5. The solubility of the salt at 25oC is3.06 g of a sample of potassium trioxochlorate(v) (KCIO3) was required to make a saturated solutionwith 10cm3 of water at 25oC. The solubility of the salt at25oC is [K=39,CI =35.5,O=16]5.0 moles dm33.0 moles dm32.5 moles dm31.0 moles dm36. Liquid X, reacts with sodium trioxocarbonate (IV) (Na2CO3)Liquid X, reacts with sodium trioxocarbonate (IV) (Na2CO3) to give a gas which turns calcium chloride solution milky. X isNa2SO4 (aq)KI (ag)An alkaliAn acid7. How many isomeric forms are there for the molecular formula C3H6Br2 ?12348. If an element has the electronic configuration 1s2 2s2 2p6 3s2 3p2 , it isa metalan alkaline earth metalan s-block elementa p-block element9. Which of the following pair of gases will NOT react further with oxygenWhich of the following pair of gases will NOT react further with oxygen at a temperature between 30°C and400°C?SO2 and NH3CO2 and H2NO2 and SO3SO3 and NO10. Which set-up in the following for the extraction of iron copper and Aluminum is correct?Some metals are extracted from their ores after some preliminary treatments by electrolysis (L) some by thermal reaction(T) and some bya combination of both processes(TL).Iron (L), copper (L) m aluminum(T)Iron (T), copper (L), aluminum (T)Ion (TL), copper (TL), aluminium(TL)Ion (T), copper (L), aluminium (TL)11. Reaction of X with yeast forms the basic of theAn unknown organic compound X has a relative molecular mass of 180. It is a colourless crystalline solid, readily soluble in water. X contains the element C, H, and O in the atomic ratio 1:2:1. The compound has aÂ sweet taste and melts on heating. In the presence of yeast and in the absence of air X is converted to compound Y in the absence of air, X is converted to compound Y and colorless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a €˜pop€™ sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.plastic industrytextile industrybrewing industrysoap industry12. The cracking process is very important in the petroleum industry because itgives purer productsYields more lubricantsYields more asphalt13. A gas that can behave as reducing agent towards chlorine and as an oxidizing agent toward hydrogen sulphide isO2NOSO2NH314. A jet plane carrying 3,000 kg of ethane burns off all the gas-forming waterA jet plane carrying 3,000 kg of ethane burns off all the gas-forming water and carbon dioxide. If all the carbondioxide is expelled and the water formed is condensed and kept on board the plane, then the gain in weight is1,800kg900kg600kg2,400kg15. Number of molecules of water of crystallisation of the barium salt is2.5g of a hydrated barium salt gave on heating, 2.13g of the anhydrous salt. Given that the relative molecular mass of the anhydrous salt is 208, the number of molecules of water of crystallization of the barium salt is10752Time is Up!