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Option (A) is correct because AgNO₃ is highly ionized.

Theenergyof anelectronin the orbit of an atom isnegative.It shows thatelectronis bound to the nucleus.Greater the value ofnegative energy,more tightly theelectronis bound to the nucleus.Bindingenergyof aelectronis E= - (13.6/n^2).

a)

b)When electron is at infinite distance from nucleus,its energy is zero. When it is brought near to the nucleus, energy becomes less than zero, i.e., negative due to force of attraction between nucleus

Catalyst has an ability to increase the rate of reaction. This ability of catalyst is known as the activity of catalyst. It depends upon adsorption of reactants on the surface of catalyst.

wrote the following

For electrons wavelength = 12.27/√V A°

so, W1 = 12.27/√50

W2 = 12.27/√200 = 12.27/2√50 = W1/2

so, W2/w1 = 1/2

=> W1/w2 = 2:1 ... ( for 50v :200v)

option 4

If the chain were totally stretched out, it would only have one possible conformation. By coiling itself, it increases the number of conformations it can have, and therefore, its entropy.

A more rigorous treatment can be found if you read up about theideal chain, which serves as a model for such systems.

Thus, assuming that no other energy exchanges takes place, the tendency of the elastic band to shrink back to its original conformation is due to something called an entropic force, i.e a tendency of the system to move to a configuration that maximises entropy.

option 1 is the correct answer because atomic radius decreases from left to right.

When ice melts it's volume remains constant.

si unit of speed is m/s (meter per second)

m/s meter per second

m/s (meter per second)

speed don't have direct si unit but it has a derive si unit that is meter/second or m/s

si unit of speed ---- metre/second

metre(m)/second (sec) is the SI unit of speed

The right answer of this question is m/s

meter per second is the S I unit of speed

m/sec (meter per second) is the SI unit of speed

The SI unit of speed is m/ sec

m/s (metre/second) is unit of speed

SI unit of speed is m/s ( meter per second)

S.I. unit of speed=metered/second this is the right answer

SI unit of speed is m/s

SI unit of speed is metre per second

m/s² is the right answer

The SIunit of speedis the metre per second, but the most commonunit of speedin everyday usage is the kilometre per hour or, in the US and the UK, miles per hour.

The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m2, or kg. m. s−2). This name for the unit was added in 1971; before that, pressure in SI was expressed simply in newtons per square metre

the correct answer is option d 4 because all the symbols will be used.

The metal oxide loses oxygen and is therefore reduced. The carbon gains oxygen and is therefore oxidised. The source of carbon for this reduction is coke, obtained by heating coal in the absence of oxygen. Aluminium is so reactive that its oxide cannot be reduced by carbon.

silver and copper are good conductor of electricity

the right answer is silver and copper

Silver and Copper is good conducter of electricity.

silver is best conductor of electricity.after this cupper is good conductor of electricity.generally metal and non metal like graphite conduct electricity.

Gold is the best answer.it's too costly if we used the silver or copper.but the good conductor is gold.

Silver, Gold, Aluminium etc are the good conductor of electricity

silver and copper are god's conductor of electricity

1 .silver (Ag)

2. copper (Cu)

Silver,gold, copper are good conductors of electricity

silver and copper are good conductor of electricity

Silver is the good conductor of electricity.

all metals r good conductor of heat and energy

silver is the best metal of electricsity this is the right answer please like my answer

Gold is best conducter of electricity

silver is the best conductor of electricity.

silver is the best conductor of electricity

Silver is the good conductor of electricity

silver and Cooper is the good conductor of electricity

sliver and copper us the answer

silver and copper are good conductors of electricity

silver and copper are good conductors of electricity but silver is best. Hope it helped uh ☺

Silver is the best conductor of electricity

Silver and copper are the best conductor of electricity

copper is best conductor of electricity due to presence of abundant Free electrons

silver is best for conductor and copper is best for electricity

silver is very good conductor of electricity.

Copper and Silver Are Most Common

Silver is thebest conductor of electricitybecause it contains a higher number of movable atoms (free electrons). by mohammad Dilshad

Silver and copper good conducter of electricity

gold is the best conductor of electricity

gold and silver and copper

Copper and silver r good conductors of electricity

copper is the good conduct of electricity

The right answer is silver and copper.silver has the highest electrical conductivit of any metal.copper has the second metal used.

silver is good conductor

the answer is a question by SILVER

Silver and copper ,Because their atoms have free electrons in their outermost shell

Silver is right answer this question

silver , aluminium and copper are good conductor of electricity

copper is good conductor of electricity and hence it is used in electric wires

silver and copper are good conductor of electricity

silver is good conductor of electricity

silver and copper are the good conductor of electricity

every mmetal is best conductor of electricity and silver is best one

you also know that silver is the best conductor of electricity

silver and copper metal are good conductor of electricity

sliver is good conducter of electricity

copper and silver are good conductor of electricity

silver is a best conductor of electricity

all metals are good conductor of electricity but best conductor of electricity is silver and copper

silver is right answer

copper is good conductor of electricity

Silver is the best metal which is a good conductor of electricity

silver is good conductor of electricity copper

silver is the best conductor of electricity

silver is the best conductor of electricity but metals are good conductor of electricity

Ag (silver) is the best conductor of electricity...

Metals in middle of the reactivity series are found in its sulphide or corbonate ores.calcination is a process of heating the ore with limited or no supply of air.the products are metal oxide with carbon dioxide.roasting is a process of heating the ore with supply of air.products are metal oxide along with sulphur dioxide.example :ZnZnCO3-->ZnO+CO22ZnS+3O2-->2ZnO+2SO2metals of high reactivity are obtained using electrolysis reductionexample:NaCl-->(Na+)+(Cl-)the metals of reactivity are found in chlorides

(1) When aluminium is dipped in nitric acid a layer of aluminium oxide is formed on the metal. This happens because nitric acid is a strong oxidizing agent. The layer of aluminium oxide prevents further reaction of aluminium. Due to this, the reactivity of aluminium decreases.

(2) This is because sodium and magnesium are more reactive than carbon. This means that carbon cannot reduce the oxides of these metals. The two metals are above carbon in the reactivity series and thus have a high affinity to oxygen than carbon does and thus cannot be reduced by it.

(3) NaCl (common salt) is solid in state and solid ions or compounds don't conduct electricity. It needs to be either melted, molten or dissolved in a solution (i.e. water) first. This is because the electrons in a solid state won't be free to move to either the Cathode (-ve) or to the Anode (+ve).

The dimensions assigned to the gravitational constant are force times length squared divided by mass squared; this is equivalent to length cubed, divided by mass and by time squared: InSIbaseunits, this amounts to meters cubed per kilogram per second squared: In cgs,Gcan be written asG≈6.674×10−8cm3⋅g−1⋅s−2.

A chemical equation is written by putting the reactants on the left side and the products on the right side. The reactants and the products are separated by an arrow,with the Arrowhead pointing towards the products. It can be made more informative by giving information about the presence of a catalyst, evolution of heat,gas,etc.

LIMITATIONS OF ARRHENIUS THEORY.Arrhenius theoryis known to be the most limited of the threetheoriessince it requires the solutions to be aqueous. It only applies to substances that produce Hydrogen ions (H+) or hydroxide ions (OH−). 1- An acid is expected to be an acid in any solvent

Arrhenius did not explain in his theory the behavior of acids and bases in a non aqueous solution For example, the dissociation of acetic acid in methanol it could be written as CH3CO2H + CH3OH⇄CH3CO2−+ CH3OH

-In Arrhenius theory all salts should produce solutions that are neither acidic nor basic. But there are some exceptions against this theory. For exampleifequal amounts of HCl and ammonia react, the solution is slightly acidic. If equal amounts of acetic acid and sodium hydroxide react, the resulting solution is basic. Arrhenius theory does not include any explanation for this.

The need for hydroxide as the base led Arrhenius to propose the formula NH4OH as the formula for ammonia in water. This led to the misunderstanding that NH4OH is the actual base. But the actual base is NH3.

-As you read before the bare proton H+, cannot exist for a long time in a water solution. Therefore this reaction: H2O + H+àH3O+Occurs most of the time.

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Twolimitations of Mendeleev’s periodic table are:

*Theposition of the element hydrogen in the periodic table could not beascertained. This is because hydrogen has the properties of both halogens andalkali.

*Becauseisotopes have different atomic masses, they should be placed at differentpoints of the periodic table. However, in Mendeleev’s periodic table, this hasnot been done and the isotopes are placed next to their core element becausethey share similar properties.

Henry Moseley illustrated that the periodic properties of an element can be explained better by its atomic number rather than its atomic mass. This formed the basis of arranging the elements in the modern periodic tables. Elements are arranged in increasing order of atomic numbers.

Ans :- Arrhenius theoryis known to be the most limited of the three theoriessince it requires the solutions to be aqueous. It only applies to substances that produce Hydrogen ions (H+) or hydroxide ions (OH−). ... For example HCL acts as anArrhenius acid when dissolved in water.

but what about rate

(a)

(b)

Gabriel synthesis. TheGabriel synthesisis a chemicalreactionthat transforms primary alkyl halides into primary amines. Traditionally, thereactionuses potassiumphthalimide. ... IntheGabrielmethod,phthalimideanion is employed as a surrogate of H2N−.

the candle will be lightened but it will float in space

Nuclear sizes are expressed in a unit called "Fermi" which is a unit of length equal to 10−15 metre (one femtometre), used in nuclear physics. It is similar to the diameter of a proton.

A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side. The coefficients next to the symbols and formulae of entities are the absolute values of the stoichiometric numbers.

This is the balanced reaction.

Aniline do not undergo friedel crafts reactions because AlCl3 which is used as a Lewis acid and a catalyst in friedel crafts reactions being electron deficient acts as Lewis base and attacks on the lone pair of nitrogen present in aniline to form an insoluble complex which precipitates out and the reaction does not proceed.

Ans :- Aniline do not undergo friedel crafts reactions because AlCl3 which is used as a Lewis acid and a catalyst in friedel crafts reactions being electron deficient acts as Lewis base and attacks on the lone pair of nitrogen present in aniline to form an insoluble complex which precipitates out and the reaction does not proceed.

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there will be exactly 60

InMendeleev's periodic table, elements were arranged on the basis of the fundamental property, atomic mass, and chemical properties.He arranged the elements such that elements with similar properties fell into the same vertical columns of theperiodic table.

Advantage of Mendeleev Periodic 1. mendeleev`s periodic table was the base for modern periodic table.2. medeleev left spaces in his periodic table for the elements which were unknown at that time.3. when the elements unknown at that time were found then they were placed in the gaps without disturbing his periodic table.4. with his periodic table he could predict the elements which were not known at that time.5. when noble gases were found they were put separately at the corner in a new group without disturbing the existing table.

In 1869, Mendeleev classified the then known 56 elements on the basis of their physical and chemical properties in the increasing order of the atomic masses, in the form of a table. Mendeleev had observed that properties of the elements orderly recur in a cyclic fashion. He found that the elements with similar properties recur at regular intervals when the elements are arranged in the order of their increasing atomic masses. He concluded that 'the physical and chemical properties of the elements are periodic functions of their atomic masses'. This came to be known as the law of chemical periodicity .

Based on this law all the known elements were arranged in the form of a table called the 'Periodic Table'. Elements with similar properties recurred at regular intervals and fell in certain groups or families. The elements in each group were similar to each other in many properties. The elements with dissimilar properties from one another were separated. Mendeleev's periodic table contains eight vertical columns of elements called 'groups' and seven horizontal rows called 'periods', Each group has two sub-groups A and B. The properties of elements of a sub-group resemble each other more markedly than the properties of those between the elements of the two sub-groups.

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(63 elements were known.)(i) Compounds of these elements with oxygen and hydrogen were studied (formation of oxides and hydrides).(ii) Elements with similar properties were arranged in a group.(iii) Mendeleev observed that elements were automatically arranged in the order of increasing atomic masses

A) Mendeleev

Explanation :

Mendeleev invented mordern periodic table

option 2 is the correct answer

but the answer is option d

option 4IS CORRECTPLEASE LIKE MY ANSWER

the correct option is (A)

why

The correct ans is option A

option (d) is correct

Hyperconjugation — the electrons in the C-H bonds surrounding the carbocation interact with the electron-deficient carbocation, contributing to increased stability. The t-butyl carbocation has 9 C-H bonds that can interact with the carbocation, so it is relatively stable.