421. Which is the purest form of water?

1. Tap water
2. Sea water
3. Rainwater
4. Distilled water

Option “3” is correct.
Rainwater is purest form of water. Its pH value is 7 .
422. Which gas is known as ‘noble gas”?

1. Hydrogen
2. Oxygen
3. Helium
4. Carbon dioxide

Option “3” is correct.
The noble gases make a group of chemical elements with similar properties under standard conditions, they are all odourless, colourless, monatomic gases with very low chemical reactivity. The six noble gases that occur naturally are Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe) and the radioactive Radon (Rn).
423. Assertion (A): Detergent easily removes oil and dirt from dirty garments.
Reason (R) : Detergent increases the surface tension of water.Code :1. Both (A) and (R) are true and (R) is the correct explanation of (A)
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Option “3” is correct.
Assertion (A) is explained in the above question. The surface tension of water is dramatically reduced by the addition of soap or detergent.
424. Milk is an example of:

1. A gel
2. A foam
3. An emulsion
4. A suspension

Option “3” is correct.
An emulsion is a colloid of two or more immiscible liquids where one liquid contains a dispersion of the other liquids. Milk is an example of an emulsion.
425. Which of the following is the procedure for a biogas plant-

1. Fermentation
2. Reduction
3. Hydrogenation
4. Polymerization

Option “1” is correct.
The cow dung or gobar gas has a lot of energy which can be stored for a biogas plant by the process of fermentation.
426. Which amongst the following is not a Cation?

1. Aluminium ion
2. Copper ion
3. Sulphate ion
4. Zinc ion

Option “3” is correct.
A cation is a positively-charged ion, while an anion is negatively charged. Sulphate is an anion.
427. Which of the following is not a component of Smog?

1. Volatile organic compounds
2. Nitrogen Oxide
3. Sulphur dioxide
4. Chlorine oxide

Option “4” is correct.
Smog is a type of air pollutant. It is composed of nitrogen oxides, sulphur oxides, ozone, smoke or particulates among others (less visible pollutants include carbon monoxide, CFCs and radioactive sources).
428. What is the common name of CaOCl2?

1. Baking Powder
2. Baking Soda
3. Bleaching Powder
4. Washing Soda

Option “3” is correct.
Calcium hypochlorite is an inorganic compound with formula CaOCl2. As a mixture with lime and calcium chloride, it is marketed as chlorine powder or bleach powder for water treatment and as a bleaching agent. Common name of  is Bleaching Powder.
429. What is the common characteristic of the elements of the same group in the periodic table?

1. Electrons in outer most shell
2. Total number of electrons
3. Total number of protons
4. Atomic weight

Option “1” is correct.
The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.
430. Which disease is caused by Nickel?

1. Itai Itai
2. Dermatitis
3. Learning disability
4. Asthma

Option “2” is correct.
Nickel allergy is a common cause of allergic contact dermatitis — an itchy rash that appears where your skin touches a usually harmless substance.

166 thoughts on “Chemistry”

  1. 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…

  2. ¡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 !

  3. ¡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 !

  4. ¡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 !

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

  6. 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/

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

  8. Alfredsheni

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

  9. 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 !

  10. 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.

  11. 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.

  12. 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

  13. 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.

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

  15. ?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 !

  16. 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 !

  17. ¡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