451. Which one of the following chemicals had been in use till now for making artificial clouds?

1. Potassium Nitrate
2. Heavy Water
3. Sulphur Iodide
4. Silver Iodide

Option “4” is correct.
Cloud seeding is the process of spreading either dry ice or more commonly silver Iodide into the upper part of clouds to try to stimulate the precipitation process and form rain.
452. Which of the following main elements is used in making matchbox?

1. Graphite
2. Phosphorous
3. Silicon
4. Sodium

Option “2” is correct.
The safety matchbox ignites due to the extreme reactivity of phosphorus with the potassium chlorate on the match head. Phosphorus is a highly reactive, non-toxic-chemical used for making the head of a matchstick.
453. ‘Humus’ is an example of-

1. Soil structure
2. Crystalloids
3. Organic colloids
4. None of the above

Option “3” is correct.
Humus usually refers to the natural decay of material such as leaves in the soil’s top layer. It is a dark organic material that forms in the soil when plant and animal matter decays.
454. Ionizing radiation is measured by-

1. Hydrometer
2. Geiger Counter
3. Seismometer
4. Ammeter

Option “2” is correct.
The Geiger-Muller Counter also called a Geiger Counter, is an instrument used for detection and measurement ionizing radiation.
455. Process of converting solid into vapour is called-

1. Vaporisation
2. Freezing
3. Melting
4. Sublimation

Option “4” is correct.
Solid directly changes into vapour and this process is called sublimation. The sublimation is the process in which some substances upon heating directly changes into vapour.
456. Which one of the following is liquid at ordinary temperature?

1. Lead
2. Nickel
3. Mercury
4. Tin

Option “3” is correct.
Mercury is the only metal which is liquid at ordinary temperature.
457.Match List-I with List-II and select the correct answer using the codes given below the lists:
1. A
2. B
3. C
4. D
Option “4” is correct.
Diamond is an allotrope of Carbon . Marble is a metamorphic rock composed mainly of crystalline calcium Carbonate or Calcium Magnesium Carbonate. The most common component of sand is Silicon dioxide in the form of quartz. Ruby is considered as one of the four precious stones together with Sapphire, Emerald and Diamond. In Chemistry, the ruby gemstone is a mixture of Aluminium, Oxygen and Chromium.
458. Which among the following is an endothermic reaction?

1. Respiration
2. Combustion
3. Sweating
4. Burning of natural gas

Option “3” is correct.
Endothermic process describes a process or reaction in which the system absorbs energy from its surroundings. Sweating is a endothermic reaction.
459. Name the catalyst used in the conversion of milk into curd?

1. Pepsin
2. Invertase
3. Lactase
4. Diastase

Option “3” is correct.
Milk is converted into curd or yogurt by the process of fermentation. Milk consists of globular proteins called casein. The curd forms because of the chemical reaction between the lactic acid bacteria and casein. Thus, lactase is the catalyst used in conversion of milk into curd.
460. _________ gets converted to phosgene, when exposed to sunlight.

1. Chloroform
2. Acetone
3. Benzene
4. Propylene

Option “1” is correct.
Phosgene can form from chloroform, in presence of oxygen and UV light.

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