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Answer:

Silk yarn of different TEXTURES can be prepared. Define the statement. Answer: ... There is a variety of silk moths which look very different from one another and the silk yarn they yield is different in textures (coarse, SMOOTH, SHINY, etc.)

Explanation:

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Calcium hydroxide, also called slaked lime, Ca(OH)2, is obtained by the action of water on calcium OXIDE. When mixed with water, a small PROPORTION of it dissolves, forming a solution known as LIMEWATER, the rest remaining as a SUSPENSION called milk of lime.

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Explanation:

Rusting REFERS to the formation of RUST, a mixture of metal oxide on the surface of metal objects or structures. This rust is formed from a redox reaction between oxygen and metal in an ENVIRONMENT containing water (such as AIR containing HIGH levels of moisture)..for rusting air and moister both are required

Explanation:

CARBON is in carbon dioxide, which is a greenhouse gas that works to trap heat CLOSE to Earth. It helps Earth hold the energy it receives from the SUN so it doesn't all escape back into space. If it weren't for carbon dioxide, Earth's OCEAN would be frozen SOLID.

Answer:

The air in EARTH's atmosphere is MADE up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of LOTS of other gases, too, such as carbon DIOXIDE, NEON, and hydrogen.

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Answer:

AIR CONTAINS oxygen and nitrogen as its MAJOR CONSTITUENTS of air. These gases retain their PROPERTIES in air. So the air is called a mixture.

Explanation:

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Sewage is a LIQUID containing wastes which is disposed by households, industrial and agricultural activities in water. It is harmful to DISCHARGE untreated sewage into rivers or seas because it can pollute the whole sources of water. Sewage CONTAINS harmful substances and disease CAUSING organisms.

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ANSWER:

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Answer:

Solar Eclipse is also known as the eclipse of the sun, it occurs when the MOON comes in between the sun and the earth. As a result, the moon blocks the light of the sun from reaching the earth's surface and CASTS a shadow on it. This occurs on a NEW moon phase. We can observe up to 5 solar eclipses per year.

Explanation:

Common USES of oxygen include production of steel, plastics and textiles, brazing, welding and cutting of STEELS and other METALS, rocket PROPELLANT, oxygen THERAPY, and life support systems in aircraft, submarines, spaceflight and diving.

Answer:

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Explanation:

ANSWER:

When carbogen is inhaled, the increased level of carbon dioxide causes a perception, both PSYCHOLOGICAL and physiological, of suffocation because the brain interprets an increase in blood carbon dioxide as a DECREASE in oxygen level, which WOULD generally be the case under natural circumstances.

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ANSWER:

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Explanation:

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Answer: AIR contains OXYGEN and nitrogen as its major CONSTITUENTS of air. These gases RETAIN their PROPERTIES in air. So the air is called a mixture.

Answer:

The modes (means) of transmission are: CONTACT (direct and/or indirect), Droplet, Airborne, Vector and Common Vehicle. The portal of ENTRY is the means by which the infectious microorganisms gains ACCESS into the new HOST.

Answer:

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Answer:

Coal gas, gaseous mixture—mainly HYDROGEN, methane, and carbon monoxide—formed by the destructive distillation (i.e., heating in the absence of air) of bituminous coal and USED as a fuel. SOMETIMES steam is added to react with the HOT coke, thus INCREASING the yield of gas.

Explanation:

The AGENTS that cause disease fall into five groups: viruses, bacteria, FUNGI, protozoa, and HELMINTHS (worms).

Answer:

Top loading HE washers work well with powdered, LIQUID or single-dose tablet homemade DETERGENT. Whichever format you have made, just ADD it directly to the washer drum. ... If you choose to use powdered detergent in a FRONT load washer, add the two TABLESPOONS directly to the drum before loading in the soiled laundry

Explanation:

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Answer:

When carbon monoxide is PASSED over heated copper OXIDE it gives carbon DIOXIDE GAS and copper metal. CuO+CO→Cu+CO2.

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Answer:

the pressure exerted by the weight of the atmosphere, which at SEA level has a mean VALUE of 101,325 PASCALS (roughly 14.6959 pounds PER square inch).

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ANSWER:

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Answer:

Alpha particle, positively charged particle, IDENTICAL to the nucleus of the helium-4 atom, spontaneously EMITTED by some radioactive SUBSTANCES, consisting of TWO protons and two NEUTRONS bound together, thus having a mass of four units and a positive charge of two.

Explanation:

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ANSWER:

Water is also a compound because it is made from more than ONE kind of element (OXYGEN and hydrogen). ... It is not a compound because it is made from atoms of only one element - oxygen. This type of MOLECULE is called a diatomic molecule, a molecule made from TWO atoms of the same type.

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Answer:

A landfill is an engineered PIT, in which layers of solid waste are FILLED, compacted and covered for final disposal. ... Engineered landfills CONSIST of a lined bottom; a leachate collection and TREATMENT system; groundwater monitoring; gas extraction (the gas is flared or used for energy PRODUCTION) and a cap system.

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Explanation:

Wood charcoal is porous and can adsorb liquids and GASES on its porous surface. Therefore, it is used in WATER filters, GAS masks and antigastric tablets, capsule or powder for people suffering from indigestion. Wood charcoal is also used as a DECOLOURIZING agent as it can adsorb COLOURING matter.

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Answer:

Each shell can contain only a fixed number of electrons: The FIRST shell can HOLD up to two electrons, the SECOND shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The GENERAL formula is that the nth shell can in principle hold up to 2(N2) electrons.

Answer:

Explanation:

The NUMBER of atoms PRESENT in one mole of an ELEMENT is equal to 12G HE

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ANSWER:

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Common uses of oxygen INCLUDE production of steel, plastics and TEXTILES, brazing, welding and cutting of steels and other metals, rocket PROPELLANT, oxygen therapy, and life support SYSTEMS in aircraft, submarines, spaceflight and diving.

Answer:

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Explanation:

●Platinum CHLORIDE is the chemical compound PtCl2. It is an important precursor used in the PREPARATION of other platinum COMPOUNDS. It exists in two CRYSTALLINE forms, but the main properties are somewhat similar: dark brown, insoluble in water, diamagnetic, and odorless.

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Answer:

Ammonia (NH3), colourless, pungent gas COMPOSED of nitrogen and HYDROGEN. It is the simplest stable compound of these elements and SERVES as a starting material for the production of many COMMERCIALLY important nitrogen COMPOUNDS.

ANSWER:

In the metallurgy of aluminium, the metal is to be ISOLATED from ALUMINA (Al2O3) by carrying out its electrolytic REDUCTION. The melting point of alumina very high (2323 K).

ANSWER:

IRON is GALVANIZED by DIPPING into ZINC.

Answer:

Hydrogen is a light and extremely powerful rocket propellant that has the lowest molecular weight of any known substance and burns with extreme intensity (5,500°F). In combination with an oxidizer such as liquid OXYGEN, liquid hydrogen yields the highest specific impulse, or efficiency in relation to the amount of propellant consumed, of any known rocket propellant. Thus, Liquid Hydrogen is the FUEL of CHOICE for SPACE exploration.

ANSWER:

NITROGEN is important to the CHEMICAL industry. It is used to make fertilisers, nitric acid, nylon, dyes and explosives. To make these products, nitrogen must FIRST be reacted with hydrogen to produce ammonia. This is done by the Haber process.

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Answer:

Explanation:

HOWEVER when wood is burned in an oven with the flow of air STOPPED, oxygen inside is soon used up and is not enough to oxidize the carbon in the wood. Thus the carbon is left to turn into charcoal. This is why when charcoal is burned, only carbon DIOXIDE is released and there is neither SMOKE nor smell.

Answer:

(a) The COLOR of the PRECIPITATE is yellow. It is the ionic compound lead(II) IODIDE (PBI2) .

Answer:

yellow

Answer: (i) The colour of the PRECIPITATE is yellow. The name of compound formed as a precipitate is PBL2 (LEAD iodide)

Explanation:

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ANSWER:

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Answer:

Explanation:

a) The compound is SODIUM BICARBONATE and formula is NaHCO  

3

​  

b) NACL +H  

2

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O+CO  

2

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+NH  

3

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→NH  

4

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Cl+NaHCO  

3

​  

c) When it is heated strongly CARBON dioxide is produced