481. Which one of the following has the highest fuel value?

1. Hydrogen
2. Charcoal
3. Natural gas
4. Gasoline

Option “1” is correct.
The heating value of a fuel is the amount of heat that is obtained after one gram (1gm) of fuel is burnt completely in air or oxygen. Hydrogen has the highest heating value among all fuels. Hydrogen is used as a rocket fuel and in burner producing high temperature.
482. The main component of Liquid Petroleum Gas (LPG) are :

1. Methane, Ethane and Hexane
2. Methane, Pentane and Hexane
3. Propane and Butane
4. Methane, Carbon Monoxide and Hydrogen

Option “3” is correct.
LPG is the abbreviation or short form Liquefied Petroleum Gas. Like all fossil fuels, it is a non-renewable source of energy. It is extracted from crude oil and natural gas. The normal components of LPG thus are propane  and butane 
483. Which of the following is mainly used for the production of Aluminium?

1. Hematite
2. Lignite
3. Bauxite
4. Magnetite

Option “3” is correct.
Bauxite is an ore of Aluminum, which is found in the form of Hydrated Aluminium Oxides.
484. Solder used in soldering metal pieces consists of any alloy of:

1. Tin and Zinc
2. Tin and Lead
3. Tin, Zinc and Copper
4. Tin, Lead and Zinc

Option “2” is correct.
The common composition of solder is 32% Tin, 68% Lead. This combination has a low melting point and is useful for soldering components that are sensitive to heat.
485. Which of the following do not consist carbon?

1. Diamond
2. Graphite
3. Coal
4. None of these

Option “4” is correct.
Diamond is an additional form of Carbon. Its relative density is 3.5 Graphite is a slaty-black coloured smooth and brightly organic matter of relative density 2.25, while coal is a solid organic matter used as fuel. All the three are consist of carbon.
486. Which one of the following fuels causes minimum air pollution?

1. Kerosene oil
2. Hydrogen
3. Coal
4. Diesel

Option “2” is correct.
Hydrogen is the purest combustion fuel. Water is generated from burning of Hydrogen. While coal, kerosene oil and diesel are known as fossil fuel which generates, Carbon dioxide and many other harmful gases when it burns.
487. Which gas is used in the purification of drinking water?

1. Helium
2. Chlorine
3. Fluorine
4. Carbon Dioxide

Option “2” is correct.
Chlorine is presently an important chemical for water purification (such as in water treatment plants), disinfectants and in bleach.
488. In a car battery, electrolyte substance used is-

1. Hydrochloric acid
2. Sulphuric acid
3. Nitric acid
4. Distilled water

Option “2” is correct.
Electrolyte substance used in a car battery is Sulphuric acid  . It is a strong acid.
489. The energy, found in dry cell is-

1. Mechanic
2. Electric
3. Chemical
4. Electromagnetic

Option “3” is correct.
The best example of changing into electric energy from chemical energy is primary cells or batteries, the dry cell is also made up in this phenomenon.
490. A pungent smell often present near the urinals is due to-

1. Sulphur-di-oxide
2. Chlorine
3. Ammonia
4. Urea

Option “3” is correct.
Urine odour is caused by the presence of Ammonia. Urine is an aqueous solution of greater than 95% water.
Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

178 thoughts on “Chemistry”

  6. Dolly

    I Love chemical…it’s my favourite subject..mere iss mein se hmesha hi boht ache marks aate hai….and my interest is also in chemistry…

  128. LazaroCrift

    ¡Hola, seguidores del entretenimiento !
    Mejores casinos online extranjeros con pagos sin registro – п»їhttps://casinoextranjerosespana.es/ mejores casinos online extranjeros
    ¡Que disfrutes de asombrosas premios extraordinarios !

  133. Stevenlix

    ¡Hola, entusiastas de la suerte !
    casinoonlinefueradeespanol con ofertas flash – п»їп»їhttps://casinoonlinefueradeespanol.xyz/ casinos online fuera de espaГ±a
    ¡Que disfrutes de asombrosas premios extraordinarios !

  134. Elmerfaict

    ¡Hola, usuarios de sitios de juego !
    Casino sin licencia espaГ±ola sin esperas – п»їcasinossinlicenciaespana.es casino online sin licencia espaГ±a
    ¡Que experimentes instantes únicos !

  137. Charlesanabs

    ¡Saludos, apostadores apasionados !
    Opiniones reales sobre casinos online extranjeros 2025 – п»їhttps://casinoextranjerosenespana.es/ casinos extranjeros
    ¡Que disfrutes de instantes irrepetibles !

  139. Coreyemind

    Предлагаем вашему вниманию интересную справочную статью, в которой собраны ключевые моменты и нюансы по актуальным вопросам. Эта информация будет полезна как для профессионалов, так и для тех, кто только начинает изучать тему. Узнайте ответы на важные вопросы и расширьте свои знания!
    Получить дополнительные сведения – https://nakroklinikatest.ru/

  140. Armandophilt

    ¡Bienvenidos, buscadores de éxitos!
    Casino por fuera con tragamonedas exclusivas – п»їhttps://casinoporfuera.guru/ casino por fuera
    ¡Que disfrutes de maravillosas tiradas afortunadas !

  141. Alfredsheni

    ¡Hola, descubridores de oportunidades!
    Casino online extranjero con juegos licenciados internacionalmente – п»їhttps://casinoextranjero.es/ casinos extranjeros
    ¡Que vivas éxitos notables !

  143. Marvinsudge

    ¡Hola, usuarios de sitios de apuestas !
    Casino online extranjero con soporte multilingГјe – п»їhttps://casinoextranjero.es/ mejores casinos online extranjeros
    ¡Que vivas premios extraordinarios !

  144. gloriaabelardo

    Personally I don’t think the criticism really sticks these days. In watchmaking as in everything else people copy you can say “are link influenced by” if you want some people do and hell if we had an Infinity Gauntlet and did a Snap on every watch that is obviously influenced by the Royal Oak we’d have a lot of dust in the air.

  145. murieldjayne

    Everything about the new GRNR for lack of a consensus nickname link yet is basically like every other 126710. The stainless steel case is 40mm by 12mm and the watch comes with choice of Jubilee or Oyster bracelet. The watch is powered by a caliber 3285 with 70 hours of power reserve and has the independent jumping hour hand to skip time zones when you travel from place to place.

  147. habibadwagner

    Brand AutodromoModel Group B S2 Corsica BlueDiameter 39mm Case Material Titanium and steelDial Color BlueIndexes PinkLume Yes on hands and hour link markersWater Resistance 50 metersStrapBracelet Steel bracelet can be removed for the use of a traditional two-piece strap

  148. ubetoraizelb

    Skull form watches have never really made a third comeback partly because they’re impractical to carry and partly because pocket watches these days are a niche of link a niche the annual production of pocket watches from high-end makers like Patek AP and Vacheron is a drop in the ocean of wristwatches that come out of Switzerland every year. However watches with skulls on the dial or otherwise incorporated into the design of a watch are in the catalogue of several brands.

  149. RichardTeard

    ¡Saludos, usuarios de plataformas de juego !
    Mejores casinos por fuera con bonos sin rollover – п»їhttps://casinosonlinefueraespanol.xyz/ casinosonlinefueraespanol
    ¡Que disfrutes de movidas extraordinarias !

  154. Stephenset

    ?Hola, exploradores del azar !
    Casino online fuera de EspaГ±a para jugar sin VPN – п»їhttps://casinosonlinefueradeespanol.xyz/ casinosonlinefueradeespanol
    ?Que disfrutes de asombrosas premios excepcionales !

  158. GerardNam

    Hello trailblazers of refreshing atmospheres !
    Air Purifiers for Smoke – High-Tech Units 2025 – п»їhttps://bestairpurifierforcigarettesmoke.guru/ best air purifier for smoke
    May you experience remarkable magnificent freshness !

  161. Patricktuh

    ¡Saludos, entusiastas del éxito !
    Casino sin licencia para nuevos jugadores – п»їaudio-factory.es casino online sin licencia espaГ±a
    ¡Que disfrutes de asombrosas botes sorprendentes!

  167. xhaidenicatherine

    Just as Tony lamented here on the pages of Hodinkee link I too prefer the smaller PRX in the 35mm sizing. It’s not because I have dainty wrists like Anthony but because I simply prefer a smaller watch most days I wear my Rolex Explorer ref. 1016. This particular dial impressed me as I generally have a bit of a weakness for Mother of Pearl and this one is really well done for 750.Rich Fordon VIP Advisor

  168. RandallTwice

    ¡Saludos, apostadores talentosos !
    Casinos con bono de bienvenida verificados 2025 – п»їhttps://bono.sindepositoespana.guru/# п»їcasino online bono bienvenida
    ¡Que disfrutes de asombrosas triunfos inolvidables !

  171. StevenKep

    Greetings, participants in comedic challenges !
    Adult jokes that go beyond expectations – п»їhttps://jokesforadults.guru/ clean jokes for adults
    May you enjoy incredible surprising gags!

  172. DavidSosut

    Hello supporters of wholesome lifestyles !
    An effective smoke air purifier is essential for shared spaces like lounges or offices. It filters out secondhand smoke to protect everyone nearby. Choose a reliable smoke air purifier for consistent results.
    Installing an air purifier for smoke near common smoking areas helps reduce airborne toxins. It’s best to use one with real-time air quality sensors. air purifier for smoke This ensures efficient operation and cleaner air.
    Best smoke remover for home with kids – п»їhttps://www.youtube.com/watch?v=fJrxQEd44JM
    May you delight in extraordinary elevated experiences !

  173. dallashcynthia

    The delightfully named Waldenburgerbahn Limited Edition on the other hand builds on Oris’ link Big Crown Pointer Date heritage platform. It pays tribute to the Swiss company’s local railroad the Waldenburgerbahn which has connected Oris’ hometown of Hölstein with Swiss hubs like nearby Basel since 1880.

  174. fleurgrosalba

    The SeaQ Panorama Date link is powered by the in-house manufactured Caliber 36-13 which can be seen in all its glory through the exhibition caseback. This self-winding movement demonstrates the brand’s high standard for its movements complete with a 100-hour power reserve decorated parts and a 4Hz beat rate.

  175. ScottKed

    Greetings, navigators of quirky punchlines !
    funny adult jokes thrive on the messy realities of adulthood. Bills, dating, aging—it’s all fair game. It’s humor with purpose.
    10 funniest jokes for adults is always a reliable source of laughter in every situation. They lighten even the dullest conversations. adultjokesclean.guru You’ll be glad you remembered it.
    light and good jokes for adults to Enjoy – п»їhttps://adultjokesclean.guru/ adult joke
    May you enjoy incredible unexpected punchlines!

  178. Robertagoto

    ¿Saludos exploradores de la suerte
    Los casinos europeos online utilizan avatares 3D para crear una identidad visual dentro de las salas en vivo. Esta personalizaciГіn mejora la inmersiГіn y la experiencia. Jugar tambiГ©n es expresarse.
    Muchos casinos europeos online tienen certificaciones eCOGRA, que garantizan juego justo y pagos rГЎpidos. Estas auditorГ­as externas fortalecen la confianza de los usuarios. Por eso los casinos europeos destacan a nivel mundial.
    Casinosonlineeuropeos con torneos activos semanales – п»їhttps://casinosonlineeuropeos.guru/
    ¡Que disfrutes de grandes jugadas !

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top