201. Which one of the following pairs is correctly matched?

1. Silver Iodide – Horn Silver
2. Silver Chloride – Artificial rain
3. Zinc Phosphide – Rat poison
4. Zinc Sulphide – Philosopher’s wool

Option “C” is correct
Pairs is correctly matched as such-
Silver Iodide – Artificial rain, Silver Chloride – Horn Silver, Zinc Phosphide – Rat poison, Zinc Oxide – Philosopher’s wool.
202. In atom, neutron was discovered by:

1. J.J. Thomson
2. Chadwick
3. Rutherford
4. Newton

Option “B” is correct
Neutron is a neutral particle which has no electrical charge. It was discovered by Chadwick in 1932.
203. The gas used to inflate the tyres of an aircraft is-

1. Hydrogen
2. Nitrogen
3. Helium
4. Neon

Option “B” is correct
Nitrogen gas is used in the tyres of an aeroplane. This is because the nitrogen gas does not support combustion and can assist in preventing wheel fire when the aircraft lands .
204. Which of these consists carbon?

1. Lignite
2. Tin
3. Silver
4. Iron

Option “A” is correct
Coal minerals are divided mainly into four types on the basis of the percentage of Carbon amount- Peat, Lignite, Bituminous and Anthracite.
205. Of how many carats is the pure gold?

1. 22
2. 24
3. 28
4. 20

Option “B” is correct
It is an extension of the older carat (Karat in North American spelling) system of denoting the purity of gold by fractions of 24, such as ’18 carat’ for an alloy with 75% (18 parts per 24) pure gold by mass.
206. Radioactivity was discovered by:

1. Rutherford
2. Becquerel
3. Bohr
4. Benjamin Franklin

Option “B” is correct
Radioactivity was discovered in 1896 by the French Scientist Henri Becquerel when he was working with phosphorescent materials.
207. Alkali metals can –

1. Be highly unstable at room temperature
2. Vaporize at room temperature
3. Easily gain electrons
4. Easily lose electrons

Option “D” is correct
Alkali metals have one electron in their outer shell so alkali metal can easily lose electrons.
208. Why does Carbon Tetrachloride have no dipole moment?

1. Because of same size of carbon and chlorine atoms
2. Because of regular tetrahedral structure
3. Because of planar structure
4. Because of similar electron affinities of carbon and chlorine

Option “B” is correct
Carbon Tetrachloride have no dipole moment because of regular tetrahedral structure.
209. Which drug is used as an Antidepressant?

1. Oxybutynin
2. Tramadol
3. Sumatriptan
4. Bupropion

Option “D” is correct
Bupropion is used to treat major depressive disorder and to help people stop smoking.
210. Which of the following gases is heavier than oxygen?

1. Carbon dioxide
2. Ammonia
3. Methane
4. Helium

Option “A” is correct
For oxygen, a molecule consists of two oxygen atoms, and has a weight of 2 x 16 = 32. For carbon dioxide, there is one carbon atom (weight 12) and two oxygen atoms (mass 16 x 2) for a total of 44. This means that carbon dioxide should be about 44/32 = 1.375 times (ideally) as heavy as an equivalent volume of oxygen. In reality, carbon dioxide is 1.383 times as heavy as oxygen.Even after solidification carbon di oxide is slightly heavier than similar volume of solid oxygen.
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

166 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!

Leave a Comment

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

Scroll to Top