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Chloromethane <Bromomethane<Dibromomethane<Bromoform

(REASON:For the same alkyl group, the boiling points of alkyl halides decrease in the order: RI> RBr> RCl> RF. This is because with the increase in size and mass of halogen atom, themagnitude of van der Waal forces increases.)

Also The Greater no. ofhalogens collectively increase the polaritytoo.

Evaporationis a type of vaporization of a liquid that occurs only on the surface of a liquid. Example is the seawater evaporating and forming into clouds.

Crystallizationis the (natural or artificial) process of formation of solid crystals precipitating from a solution, melt or more rarely deposited directly from a gas. Example is the dry ice.

Evaporationtakes place only at surface.

Crystallizationtakes place through out the container.

this is furanose structure

When calcium chloride and Sodium sulphate react, they form equal amount of sodium chloride and calcium sulphate. Hence the law of conservation of matter is verified

We can distinguish between an alcohol and a carboxylic acid on the basis of their reaction with carbonates and hydrogen carbonates. Acid reacts with carbonate and hydrogen carbonate to evolve CO2 gas that turns lime water milky.

Alcohols, on the other hand, do not react with carbonates and hydrogen carbonates.

X2+can be an alkali earth metal cation say Ca2+

Ycan be phosphorus since it has +5 oxidation state, and Z can be oxygen with -2 oxidation state

First Y and Z combine to form a complex anion YZ43-(net charge = 5 - 4x2 = -3) just like PO43-phosphate anion.

Then X2+combines with YZ43-to form X3(YZ4)2. So it will be

zinc can react with copper sulphate as it is more reactive than copper

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The name ''pig iron'' originated in the early days of iron-ore reduction when the total output of the blast furnace was sand cast into ''pigs'' —a mass of iron roughly resembling the shape of a reclining pig. The oldest method of pig casting in sandbeds has been largely superseded by pig casting machines

farenhait me pani ka boiling point 212° F hota hai

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hiican you give me lecture notes of class 11 mole concept chapter

Buffer action: The ability of the buffer solution to resist the changes in pH value on the addition of small amount of an acid or a base is known as buffer action.

Buffer solution: A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications.

Ozone layer is formed in the stratosphere by the action of UV light on molecular oxygen (O2). UV light breaks down oxygen molecule (O2) into nascent oxygen (O). The nascent oxygen atom combines with oxygen molecule to form ozone (O3).

O2→ (under UV)2O

O + O2 → O3

Ozone layer protects living organisms from harmful radiation (UV) of sun by absorbing it. UV light is very harmful for the body as it causes cataracts, sunburn, DNA damages leading to skin cancer etc.

cu metal can displace fe from feso4 solution

Moseley's lawis anempirical lawconcerning the characteristicx-raysthat are emitted byatoms. The law was discovered and published by the English physicistHenry Moseleyin 1913. It is historically important in quantitatively justifying the conception of the nuclear model of the atom, with all, or nearly all, positive charges of the atom located in the nucleus, and associated on an integer basis withatomic number. Until Moseley's work, "atomic number" was merely an element's place in the periodic table, and was not known to be associated with any mMoseley's law is an empirical law concerning the characteristic x-rays that are emitted by atoms. The law was discovered and published by the English physicist Henry Moseley in 1913. It is historically important in quantitatively justifying the conception of the nuclear model of the atom, with all, or nearly all, positive charges of the atom located in the nucleus, and associated on an integer basis with atomic number. Until Moseley's work, "atomic number" was merely an element's place in the periodic table, and was not known to be associated with any measurable physical quantity measurable physical quantity.

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a law stating that the ratio of the sines of the angles of incidence and refraction of a wave are constant when it passes between two given media.

7x143=1001; 11x13=143; 13x1=13;

Luminous intensity is an expression of the amount of light power emanating from a point source within a solid angle of onesteradian.

Divided by thefluxper unit solid angle is equaltotheintensity; divided by thefluxper unit area is equaltotheintensity of illumination,intensitydivided by unitofarea equal brightness

Hybridisation= number of sigma bonds + lone pair.CH3Cl= 3 sigma bonds betweenC& H and 1 betweenCand Cl There is no lone pair ascarbonhas 4 valence electrons and all of them have formed a bond (3 with hydrogen and 1 with Cl). Now,hybridisation= (3+1) + 0= 4 = sp3 (1 s & 3 p).In CH3CN, first carbon is sp3hybridised (4σbonds).second carbon is sphybridised (2πbonds and 1σbond).

Your Answer Is (D) HF

HCl never form hydrogen bond. where all the others form

I think HCL is correct

(c) HCLis a correct answer

The group of Magnesium and barium is same.

So, the valency of barium is +2 and the valency of nitrate is -2.

So, the formula of barium nitrate of BaNO3.

On other hand the valency of the sulphate is -2, so the formula of the Barium sulphate is BaSO4.

In NaCl, the cation (Na + ) and anion (Cl− ) are of almost similar sizes. The defect shown by these cations and anions is Schottky defect. Whereas Frenkel defect is generally found in ionic crystals where anion is much larger in size then that the cation.

Schottky defect arise due to missing of ions from their lattice point and Frenkel defect arise when the missing ions occupy interstitial sites. The radius of AgBr is intermediate hence it shows both Frenkel and Schottky defects.The major defect in AgBr is Frenkel defect. It has ccp lattice. Ag moves from octahedral to tetrahedral sites causing only cations to precipitate. Schottky defect in AgBr is exhibited due to precipitation of both cations and anions.In AgBr, Ag+ ion is small in size and when removed from lattice point they can occupy interstitial sites and hence show both Frenkel and Schottky defects.

(a) The method to be followed is that , acid (sulphuric acid) should be added to water , and not vice versa. That is , water should NEVER be added to acid. This is because water reacts very vigorously when added to acid, and releases a large amount of heat , and splashes the concentrated acid(sulphuric acid) out of the container.

(b) The process of adding acid to water , is called dilution of acids.

This technique is hydrogenation of oils Principles and catalysts for hydrogenation of fats and oils ... Hydrogenation of vegetable oils has been practiced since the discovery by Normann some 75 years ago and is the major chemical process in the fat and oil industry. Hydrogenation changes a liquid oil to a semisolid fat which has more utility and better flavor stability.

i)

ii) TheBrownian movementexplains the force of gravity acting oncolloidal particles. This helps inproviding stabilitytocolloidalsols by not allowing them to settle down

this is of which ques

answer

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The limitations of J.J Thomson’s model of an atom are following:

(a) It could not explain the result of the scattering experiment performed by Rutherford.

(b) It did not have any experimental evidence in its support.

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he is a scientist ..

he is the great scientist awarded with noble prize

Avoid water at all times when working with electricity.

Never touch or try repairing any electrical equipment orcircuitswithwethands.

It increases theconductivityof electric current.

Excavation and underground services.

Overhead power lines.

Work using electrically powered equipment.

Work on electrical equipment, machinery or installations.

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please post full question

(b) cannot move ..hence they have fixed lattice structure

A normal hydrogen (H) atom does not have any neutrons in its tiny nucleus. Its isotopes have neutrons.

Ans :- J.J. Thomson discovered negatively charged particles by cathode ray tube experiment in the year 1897. The particles were named electrons. J.J Thomson believed electrons to be two thousand times lighter than a proton. He assumed that an atom is composed of a cloud of negative charge in a sphere of positive charges.

Ans :-

Joule’s law of heating states that when a current ‘i ' passes through a conductor of resistance ‘r’ for time ‘t’ then the heat developed in the conductor is equal to the product of the square of the current, the resistance and time.

H = i^2rt

The reason behind the heat produced is the collision of the free electrons with the lattice ions or atoms while accelerating in presence of the external electric field.

we know that

volt= work done/ total charge or v = w/q

from this we get w= vq

we know that current i = q / t

so q = it

putting this in prev equation

we get w = vit

from ohms law v = ir

putting it in prev eq we get

w = irit = i^2rt joule as work is stored as heat so H = I^2RT Joules.

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The lighter the mass , greater will be the exit velocity. so, lesser will be the amount left in the container.

and mass of CO = 28... while mass of B2H2 is 27.66 , mass of CH4 = 16 and mass of H2 = 2.

so, Pco = P(diborane) > Pch4 > P(H2)

base react to form water and a salt and involves the combination of H+ions and OH-ions to generate water. Theneutralizationof a strong acid and strong base has a pH equal to 7. ... Table 1: The most common strong acids and bases.

Aneutralizationreaction is when an acid and a base reacttoform water and a salt and involves the combination of H+ions and OH-ionstogenerate water. Theneutralizationof a strong acid and strong base has a pH equalto7.

acid neutralizes base and a salt along with water will be formed

in the process Neutralization acid react with base form salt and water.

Neutralization is a chemical reaction in which acid and base react to form salt and water. Hydrogen (H+) ions and hydroxide (OH- ions) reacts with each other to form water. The strong acid and strong base neutralization have the pH value of 7. Let’s find out more about Neutralization.Neutralization is a process whenacids and basesreact to form salt and water.In a reaction to water, neutralization results in excess of hydrogen or hydroxide ions present in the solution. The pH of the neutralized solution depends on the strength of acid or base involved in it. If a strong acid is mixed with a strong base then the salt formed is neutral. If a strong acid is mixed with a weak base then the acid formed is acidic. Similarly, if a weak acid is mixed with a strong acid then the salt formed is basic Neutralization is used in many applications.

For example, Acid + Base —-> Salt + Water i. e. NaOH (Sodium Hydroxide, a base) + HCl (Hydrochloric acid, an acid) ——> NaCl (Salt) + H2O (Water)

Uses Of Neutralization

Some uses of Neutralization are as follows:

To treatwasp stings

Wasp Sting’s venom is basic in nature, applying vinegar to the sting neutralizes the sting as vinegar is acidic in nature.

To treatacidity or gastric patients

Acidity or gastric problems arise due to an increase of acid in the stomach,Anti-acids or antacids are medicines containing bases such as NaCHO3 (sodium bicarbonate) Mg(OH)2 (magnesium hydroxide) neutralize excess of acid in the stomach

Neutralization. Aneutralizationreaction is when an acid and a base reacttoform water and a salt and involves the combination of H+ions and OH-ionstogenerate water. ... When a solution is neutralized, it means that salts are formed from equal weights of acid and base

In the process of neutralization, a strong or weak acid react with a strong or weak base to form salt and water

For example

HCl + NaOH = NaCl + H2O A B C D

A = AcidB = BaseC = SaltD = Water

The enthalpy of neutralization is the change in enthalpy that occurs when one equivalent of an acid and one equivalent of a base undergo a neutralization reaction to form water and a salt. It is a special case of the enthalpy of reaction. It is defined as the energy released with the formation of 1 mole of water

(1)

(2)

1. ENTHALPHY of neutralisation

i) The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding cloud of electrons

ii) Ionization Enthalpyisdefinedas the amount of energy required by an isolated gaseous atom to lose an electron in its ground state.

Ans :- White blood cells are part of the body's immune system. They help the body fight infection and other diseases. Types of white blood cells are granulocytes(neutrophils, eosinophils, and basophils), monocytes, and lymphocytes (T cellsand B cells).

both plants and animals are source of foods.

answer .........(2.....................

2 is the correct answer to this question

the 3rd option is correct..

all of these have more than 8 electron in outermost orbit..

the answer could be option 1

option d is the correct answer

the answer could be option 1

Golgi apparatus secretes enzymes mucuos and hormones