261. Who discovered Nitrogen?

1. Faraday
2. Heisenberg
3. Hooke
4. Rutherford

Option “D” is correct
Nitrogen is a chemical element with symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772.
262. Using which of the following processes can one separate a solute from its solution?

1. Sedimentation
2. Evaporation
3. Filtration
4. Condensation

Option “B” is correct
Evaporation can separate a solute from its solution.
263. Adding which substance gives blue colour to glass?

1. Manganese oxide
2. Cobalt oxide
3. Chromium oxide
4. Iron oxide

Option “B” is correct
Cobalt oxide is added to glass to gave it blue colour.
264. Which of the following elements has the lowest melting point?

1. Sodium
2. Tin
3. Radon
4. Radium

Option “C” is correct
Radon has lowest melting point among the following elements.
265. Atomic number of which of the following elements is greater than that of Fluorine?

1. Sodium
2. Beryllium
3. Nitrogen
4. Boron

Option “A” is correct
Atomic Number of Beryllium is 4, Boron is 5, Nitrogen is 7, Fluorine is 9 and Sodium is 11. Hence, the atomic number of Sodium is higher than that of Fluorine.
266. Which of the following induces souring of milk?

1. Acetic Acid
2. Citric Acid
3. Ascorbic Acid
4. Lactic Acid

Option “D” is correct
Milk contains a sugar called lactose. It also contains harmless bacteria called lactobacillus, which uses lactose for energy and creates lactic acid as a by-product. It is the lactic acid which makes milk taste sour.
267. What is the net charge on Calcium fluoride?

1. 1+
2. 0
3. 1–
4. 2–

Option “B” is correct
The net charge of the ionic compound is zero. It is composed of one ion of calcium with a positive two charge and two ions of fluorine with a negative one charge on each. The charges cancel out, leaving the compound with no net charge.
268. Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?

1. B2H6
2. NF3
3. CCl3F
4. C6H6

Option “C” is correct
Trichlorofluoromethane, CCl3F consists of a centrally placed carbon atom with three chlorine atoms and one fluorine atom arranged approximately (the bond lengths are different) at the points of a tetrahedron around it. Trichlorofluoromethane is a greenhouse gas and ozone depleter.
269. Which of the following is not soluble in water?

1. Lead sulphate
2. Zinc sulphate
3. Potassium sulphate
4. Sodium sulphate

Option “A” is correct
Lead Sulphate is not soluble in water.
270. Ethylene is a ______ molecule.

1. Polar
2. Ionic
3. Covalent
4. Nonpolar

Option “D” is correct
Ehthylene is a hydrocarbon which has the formula C2H4 since the double bond is between two carbon atoms so there is no difference in electronegativity.That’s why the shared pair of electron come lie in between those to carbon atoms, so ethylene is non polar.
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