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COAL gas is a flammable gaseous fuel made from coal and supplied to the user via a PIPED DISTRIBUTION SYSTEM. It is produced when coal is heated strongly in the absence of air. Town gas is a more GENERAL term referring to manufactured gaseous fuels produced for sale to consumers and municipalities.

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EXPLANATION:

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i GUESS DIFFUSION is the answer

ong>ANSWER:

इलेक्ट्रॉनिक विन्यास मूलाधार है

प्रथम आवर्त में केवल 2 तत्व-हाइड्रोजन एवं हीलियम हैं। दूसरे तथा तीसरे आवर्त में आठ-आठ तत्व हैं। चौथे एवं पाँचवें आवर्त में, प्रत्येक में 18 तत्व हैं जबकि छठा आवर्त सबसे बड़ा है और इसमें 32 तत्व हैं।

ong>Answer:

IN 50 ml of water = 10 g of solute DISSOLVED

IN 400 ml of water = 80 g of solute dissolved

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ong>Explanation:

It states that

"Overall the ENTHALPY change for a reaction is EQUAL to sum of enthalpy changes of INDIVIDUAL steps in the reaction".

Ex:

1. 2H2 + N2 gives N2H4. ∆H=+95.4KJ
2. N2H4 + H2 gives 2NH3. ∆H=-187.6KJ

3H2 +H2 gives 2NH3. ∆H=-92.2KJ---eqn3

eqn3 gives TOTAL enthalpy change of reaction.

APPLICATION:

The Hess's law has been usefull to calculate the enthalpy changes for the REACTIONS with their enthalpies being not known experimentally.

Explanation:

ong>Answer:

EXPLANATION:

Gold PLATING can be added to ALMOST any metal, including brass, copper or nickel. ... If you have a silver component, for example, it will first be plated with copper because copper will make the plating TARNISH slower. Then a plate of nickel will be added to improve the bond and strengthen the barrier.

ong>Explanation:

Chemical reaction, a process in which one or more SUBSTANCES, the REACTANTS, are CONVERTED to one or more different substances, the products. ... A chemical reaction rearranges the constituent ATOMS of the reactants to create different substances as products.

helpful to you

ong>Explanation:

In physics, a force is any INTERACTION that, when unopposed, will change the MOTION of an object. A force can cause an object with MASS to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and DIRECTION, making it a vector quantity.

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ong>Answer:

Chemistry is the SCIENTIFIC DISCIPLINE involved with elements and compounds COMPOSED of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they UNDERGO during a reaction with other substances.

there is some EXAMPLES of thermosetting PLASTIC

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Immediately measure the LENGTH of foam produced.

The QUANTITY of INK put on each piece of CLOTH should be EQUAL.

ye kya hai tum pagal ho kya ye padai KA app hai apke moj ke liye nhi

Change the TEST of TONGUE

ong>ANSWER:

hair GEL

wax and FACE gel NATURAL gel

ong>Answer:

Hydrogen

Metals that REACT with steam form oxides. Hydrogen is ALWAYS produced when a metal reacts with cold water or steam.

...

Reactivity series of metals.

Order of reactivity Metal Reactions with water or steam

Third most reactive CALCIUM (CA) LESS vigorous reaction with cold water

answer (a)

Bohr’s model of the hydrogen atom is based on three postulates: (1) an electron moves around the nucleus in a circular orbit, (2) an electron’s ANGULAR momentum in the orbit is quantized, and (3) the change in an electron’s energy as it makes a quantum jump from one orbit to another is always ACCOMPANIED by the emission or absorption of a PROTON.

ong>EXPLANATION:

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ong>Answer:

According to MENDELEEV's PERIODIC Law, isotopes of an element must be given separate places in the periodic table because they have different atomic masses. It does not explain the electronic arrangement of elements. Elements that are chemically SIMILAR such as Gold and Platinum have been placed in separate GROUPS.

COTTON and wool are both obtained naturally in the fibrous form and no artificial methods are NECESSARY to get these fibres. In contrast, nylon is a synthetic fibre obtained from PLASTICS derived from petroleum.

ong>Answer:

1) High HEAT capacity is not CHARACTERISTIC of water

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The crystal will BECOME bigger in size.

Explanation:

∵ The supersaturated solution can't dissolve any more COPPER sulphate. But the crystal is unsaturated so it will absorb more solution and become bigger in size.

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ong>Answer:

11)

When thermal energy is added to a substance, its temperature increases, which can change its state from SOLID to liquid (melting), liquid to gas (vaporization), or solid to gas (sublimation). ... When the PRESSURE exerted on a substance increases, it can cause the substance to condense.

12)

Explanation: Gases can be compressed, because they just take up WHATEVER space is available to them. This is because gases consist of molecules that have too little interactions between them to stick together. They just move ALONG until they collide, either with a wall or with each other.

ong>ANSWER:

a) orbital in nitrogen is more stable than in oxygen, which has one ELECTRON more than the half-filled CONFIGURATION. So, the ionization energy of nitrogen is more than that of oxygen

b)The atomic radius of atoms GENERALLY decreases from left to right across a period. ... Within a period, protons are added to the NUCLEUS as electrons are being added to the same principal energy level. These electrons are gradually pulled closer to the nucleus because of its increased positive charge.

Explanation:

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Answer:-

The formula of 'X' is MgAl₂O₄ [OPTION.b]

Explanation:-

→ CHARGE of Magnesium ion = +2

→ Charge of Aluminium ion = +3

→ Charge of Oxide ion = -2

Now, we know that net charge of an ionic compound is always zero. So among the given options, the compound having net charge zero will be the answer.

For Option (a):-

Net charge :-

= 2(+2) + 1(+3) + 4(-2)

= 4 + 3 - 8

= -1

For option (b):-

Net charge :-

= 1(+2) + 2(+3) + 4(-2)

= 2 + 6 - 8

= 0

For option (c):-

Net charge :-

= 1(+2) + 1(+3) + 4(-2)

= 2 + 3 - 8

= -3

For option (d):-

Net charge :-

= 4(+2) + 1(+3) + 4(-2)

= 8 + 3 - 8

= +3

________________________________

The net charge in MgAl₂O₄ is zero, so it is the REQUIRED answer!

STRENGTH of the intermolecular forces.

solid = it has very strong intermolecular forces. LIQUID = it has less intermolecular force as compared to the solid. gas = it has NEGLIGIBLE intermolecular force.

ong>Answer:

Positives REPRESENTS PROTON, NEGATIVE - electron, 0+neutrons

TEARING of paper

Explanation:

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WATER can be dirty or the sudden ACTION of drinking water can do this

ong>But, like solids and liquids, air is matter. It has weight (more than we might imagine), it takes up space, and it is COMPOSED of particles too small and too SPREAD apart to see. Air, a mixture of gases, shares properties with WATER vapor, the gaseous form of water that is part of air.

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᯽ANSWER:-}

The term composition (from Latin com- "with" and ponere "to PLACE") as it refers to writing, can DESCRIBES writers' decisions about, processes for designing, and SOMETIMES the final product of, a DOCUMENT. In original use, it tended to describe practices concerning essays, narratives, or genres of imaginative literature, but SINCE the mid-20th century emergence of the field of composition studies, its use has broadened to apply to any composed work: print or digital, alphanumeric or multimodal.

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ong>EXPLANATION:

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ong>Answer:

energy is NEITHER released nor ABSORBED during the formation of a MIXTURE

ong>Answer:

Electronic configuration = 1. So hydrogen needs 1 more electron to complete its duplet and nitrogen needs THREE more ELECTRONS to complete its octet. HENCE, three hydrogen atoms each share their 1 electron with nitrogen to form three covalent bonds and make an ammonia molecule (NH3) ammonia molecule.

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Gautamiputra Shri Satakarni and other SATAVAHANA rulers were known as lords of the dakshinapatha. Dakshinapatha was the route leading to the SOUTH, which was also used as a name for the entire southern region.In ORDER to control the coasts, he sent his army to the eastern, western and southern coasts.

When an ACID react with a metal it liberates hydrogen gas. To test the presence of H2 gas, bring a burning splinter near the mouth of the test tube where H2 gas is released, the MATCH STICK bums with a pop sound.

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Distilled water is a PURE TYPE of water which does not contain any IONS in it. ... These gases dissolve in water to FORM some kind of acids like carbonic acids which dissociates to give ions. Thus rainwater is conducting ELECTRICITY while distilled water is not conducting electricity.

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le zone REPRESENTS the partial combustion in candle FLAME

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ong>For this reason, some people STORE butter on the COUNTER RATHER than in the fridge.

For this reason, some people store butter on the counter rather than in the fridge.But does butter go BAD if you leave it out? This article explores whether it actually needs to be REFRIGERATED or not.

ong>Answer:

An OXIDE (/ˈɒksaɪd/) is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula. "Oxide" itself is the dianion of oxygen, an O2– (molecular) ion. Metal oxides THUS TYPICALLY CONTAIN an anion of oxygen in the oxidation state of −2.

Explanation:

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ong>EXPLANATION:

Potential energy, stored energy that depends UPON the relative position of various PARTS of a system. A spring has more potential energy when it is compressed or STRETCHED. A steel ball has more potential energy raised above the GROUND than it has after falling to Earth.

ong>Explanation:

SET up which show acid SOLUTION in WATER conduct ELECTRICITY

Na is oxidised and o2 is REDUCED

Cu is reduced and H2 is oxidised to WATER

ong>Answer:

A PHYSICAL change is any change in matter that involves the substance going from one physical state to ANOTHER. ... Water boiling is a physical change as water molecules vibrate faster, they enter the gas PHASE and become water vapor.

Explanation: