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Benzene hexachloride(B.H.C.) , any of several stereoisomers of 1,2,3,4,5,6-hexachlorocyclohexane formed by the light-induced ADDITION of chlorine to benzene. one of these e isomers is an insecticide called LINDANE, or GAMMEXANE. ... More volatile than DDT, BHC has a faster but LESS protracted action upon INSECTS..

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Given

3.32 X 10^-23 gm = 1 atom of an ELEMENT

1 gm = 1/(3.32 x 10^-23) atoms

20 gms = 20/(3.32 x 10^-23) atoms

= 6.02 x 10^23 atoms = N (AVAGADRO number) atoms

Therefore the atomis MASS of the element = 20 gms = 1 mole of the element

No of ELECTRONS is 128...HOPE its CRCT

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The formulae of the oxide is :

M x O y

Let X be MOLES of M and y be moles of OXYGEN.

Mass of oxygen is 0.47g

Mass of M is 0.53g

Moles of M = 0.53 / 24 = 0.02

Moles of Oxygen = 0.47 / 16 = 0.03

Mole ratio :

M : O = 0.02 : 0.03

= 2:3

The empirical formula of the oxide is thus :

M3O4

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The RXN is EXOTHERMIC rxn

ENERGY of n= 2 is -328.32 KJ / mole
Energy of n= 3 is - 145.92kj / mole

So
E3 - E2 = - 145.92 - (-328.32)
= 182.4 kj / mole. ..


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Suppose the ELEMENT is o then it's ion WOULD be O2- because to attain it's nearest STABLE electronic configuration(neon ) it will gain TWO electrons.

about 70 PERCENT of iron is found in our red blood CELLS CALLED hemoglobin and muscle cells called MYOGLOBIN

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Ice is solid at 0°C , while water is LIQUID at a room temperature; This is because the freezing point of water is 0°C at atmospheric pressure and the water is at liquid STATE in room temperature because it melts at 0°C at atmospheric pressure.

Water can be freezed at 10°C also if its pressure is increased.The state of MATTER not only depends on its temperature but it also depends on the pressure.


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Its a GLUCOSE FORMULA

Fluorine is more electronegative due to its SMALL size than chlorine and so it can attract SHARED pair of electrons EASILY and strongly. So it is a more stronger oxidising AGENT than chlorine.

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N2+3H2<--->2NH3
This is the BALANCED EQUATION..

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The COAL, petroleum products and natural gas, are natural resources, collectively called, as FOSSIL fuels. These were formed by nature, from what was originally organic matter, millions of YEARS ago. Fossil fuels are NON renewable resources. Coal is a natural resource, with high carbon content.

This INDICATES that the gas produced is hydrogen. Zinc forms the salt zinc sulfate with sulfuric acid and zinc chloride with hydrochloric acid and releases hydrogen gas in both cases. In general, a metal REACTS with an acid to form a salt and releases hydrogen gas

The general equation for a metal reacting with an acid is.

metal + acid → salt + hydrogen

Hydrogen is a colourless, odourless gas. So you may wish to confirm that the gas produced is indeed hydrogen.

In order to do this, run your experiment in a test tube. (E.g FILL a small amount of acid, place some metal in, e.g magnesium) and place a bung inside the test tube to trap the gas.

Then, introduce a burning splint to the test tube. If a “Squeaky pop” occurs then you have confirmed that hydrogen is produced.

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A SUBSTANCE in which some other substances are also present in SMALLER amounts is called an impure matter.
A substance CONTAINS only ONE substance, with no other substances MIXED in. Is called pure matter .

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Yes, this statement is true that evaporation causes cooling. This can be EXPLAINED as follows:
When a drop of spirit it put on our hand then aur hand feels cool because the spirit absorbs the latent HEAT NEEDED to EVAPORATE. THUS the hand looses the heat and we feel cool.



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GAS state because the PARTICALS of gases are moving CONTINUOUSLY in everywhere (it is the property of matter)

ex. like the spread of smell of dhoop batti in every corner of the room

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Because it is MADE of DIFFERENT ELEMENTS

Mass of FLOURINE is 9.
so, it NEEDS 1 ELECTRON to be inert state.
So, it is ANION.

Because a MIXTURE CONTAINS SEVERAL GASES...

It is surely an ENDOTHERMIC REACTION as it is HEATED, i.e. heat is provided from outside to make the reaction take place.

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Yes it is a displacement reaction because CARBON comes before ZINC in the Reactivity SERIES, so carbon can DISPLACE zinc from zinc oxide.

The equation is- ZnO + C = CO + Zn

In the first group, Cl will be more electronegative because as we MOVE from Cl to F the atomic size increases. This leads to repulsion among the electrons so the ELECTRONEGATIVITY of F decreases.

But in the second pair F is more electron than O this can be explained in TERMS of the SMALLER size of F ATOMS and increased nuclear charge which is more than that of O even after a slight decrease due to the forces of repulsion as explained above.

ANSWER:

it is a REACTION in which HEAT is produced i.e TEMPRATURE increases

eg. Ca + H2O= Ca(OH)2+H2+heat

Remember that metals react with OXYGEN in the air to produce metal oxides, like magnesium OXIDE. Non-metals react with oxygen in the air to produce non-metal oxides. Here are TWO EXAMPLES for the non-metals carbon and sulphur. Non-metal oxides such as sulphur dioxide and nitrogen oxide are responsible for acid rain.Metal oxides;
They are usually SOLID at room temperature.
They are basic in nature
If they dissolve they form alkalinw solutions.

Non metal oxide;
Usually gaseous at room temperature.
Are acidic in nature.
Dissolve in water to form aciduc solutions.

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No, MASS of alpha PARTICLE is 4 times GREATER than mass of PROTON:

Mass of proton= 1.67 X 10^-27 kg

Mass of alpha particle: 6.68 x 10^-27 kg

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During RESPIRATION, glucose MOLECULES are converted to other molecules in a series of steps. They finally end up as carbon dioxide and water. The reactionis exothermic because the C=O and O-H BONDS in the products are so much more stable than the bonds in the reactants.

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Metals are sonorous while NON metals are non sonorous. There are EXCEPTIONS LIKE Mercury being metal is not sonorous while TIN, GOLD, aluminum etc. are sonorous metals.

When metals beaten HARDER they can be drawn into thin sheets which is one of the property of metals that is malleable property. But when we COME to non metals then cannot be done like this.
We can see in current carrying metals like COPPER etc are USED due to there property that they conduct electricity. But non metals cannot conduct electricity.
In current carrying conductors this wires are used like copper because metals can be drawn into thin wires that is a property of metals that is they are ductile. But we can not see this property in non metals.

Benzene is FORMED on the REDUCTION of benzene diazonium chloride with sodium stannite or hypophosphorus acid.

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✔HYDROGEN gas is not produced when a metal reacts with NITRIC Acid ( HNO3). This is because Nitric Acid is a strong Oxidizing AGENT . It OXIDIZED the Hydrogen produced and itself gets reduced to any one of the OXIDES of Nitrogen .

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Hello.
None of the no. From this are equal.
Also,the LARGEST no. From your QUESTION is 4

I think U R asking about benzene.

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Benzene REACTS with chlorine in the PRESENCE of a catalyst, replacing one of the hydrogen atoms on the RING by a chlorine atom. ... The reaction between benzene and chlorine in the presence of either aluminium chloride or iron gives chlorobenzene.

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John Dalton, aBritish chemist and physicist, developed a theory that matter is simply COMPOSED of atoms of DIFFERENT weights and is combined in RATIOS by weight.


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It's D] MERCURY.


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In fact, an ALPHA particle really is a nucleus - it's the same as the nucleus of a common atom of helium - but it doesn't have any electrons AROUND it, and it's traveling very FAST. Alpha particles are a type of ionizing radiation. To describe the production of alpha particles, we have to DEFINE radioactive DECAY.

ATOMS always try to have full “shells” of electrons. If they have not enough electrons to make full shells, they can find more by sharing electrons with ANOTHER ATOM. For the halogen gases, and oxygen, nitrogen and hydrogen, this is easily ACCOMPLISHED by pairing up.

Elemental oxygen is not only found in pairs: it can ALSO be found in the form of ozone, a molecule with 3 oxygen atoms.

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RATIO of MOLECULAR mass to the empirical FORMULA will be 2