Explore topic-wise InterviewSolutions in Current Affairs.

Explanation:

DISCOVERY of ELECTRONS, Protons and Neutrons

Discoverer Year of Discovery

Proton E. Rutherford 1909

Neutron JAMES Chadwick 1932

Electron J.J. THOMSON 1897

Answer:

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Explanation:

it is possible to convert ETHANE and propane in the presence of steam and OXYGEN over a CATALYST COMPRISING calcium-nickel-potassium oxide , to both lower and higher hydrocarbons at temperatures in the range of 300-600" C

Answer:

AMONGST the alkenes that show GEOMETRICAL ISOMERISM, cis-alkenes have higher boiling POINTS than the corresponding trans-isomers because cis-isomers being polar have stronger dipole-dipole interactions.

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Enantiomers are chiral molecules that are mirror IMAGES of ONE another. Furthermore, the molecules are non-superimposable on one another. This means that the molecules cannot be placed on TOP of one another and GIVE the same molecule. Chiral molecules with one or more stereocenters can be enantiomers.

Answer:

1] Exposure to prolonged or excessive noise has been shown to cause a range of health PROBLEMS ranging from STRESS, poor concentration, PRODUCTIVITY losses in the workplace, and communication difficulties and fatigue from lack of SLEEP, to more serious ISSUES such as cardiovascular disease, cognitive impairment, tinnitus

2] -

Answer:

For structural COMPONENTS, STRENGTH and fracture toughness are two important MECHANICAL properties. Yield strength is the measure of the stress that a METAL can withstand before deforming. Tensile strength is a measure of the maximum stress that a metal can support before STARTING to fracture.

Explanation:

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Answer:

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Explanation:

Why does not the ATOMIC MASS of an element represent the actual mass of its atom? ... The relative atomic mas of hydrogen is u and its CORRESPONDING GRAM atomic mass is 1 . If the atomic mass of an element is in fraction, this means that it EXISTS in the form of isotopes.

Answer:

In a DISPLACEMENT REACTION, a more reactive element replaces a less reactive element from a compound. ... In a double displacement reaction, TWO displacements take place to complete the reaction. AB + CD → AC + BD. Change in COLOR TAKES place with no precipitate forms

Answer:

Just stick to homogeneous with the extra 'e'. To summarise, Earlier, homogenous was used as a scientific TERM, mainly in biology, but now it is almost obsolete, being replaced by homologous. WHEREAS, homogeneous is a common WORD, very MUCH in use and means having SIMILAR or comparable characteristics

Answer:

The apparatus NEEDED DEPENDS on the nature of the product being measured: the mass of a substance - solid, LIQUID or GAS - is measured with a balance. the VOLUME of a gas is usually measured with a gas syringe.

ANSWER:

MOLECULE

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Answer:

Explanation:

The key here is to REALIZE that you're dealing with a hydrocarbon, that is, a compound that contains only carbon and hydrogen.

Notice that the products of this combustion reaction are carbon dioxide,  

CO

2

, and WATER,  

H

2

O

.

This tells you that all the carbon that was initially a part of the hydrocarbon will now be part of the carbon dioxide. Likewise, all the hydrogen that was initially a part of the hydrocarbon is now a part of the water.

This means that you can use the number of moles of water and carbon dioxide, respectively, to determine how many moles of carbon and of hydrogen were originally present in the hdyrocarbon.

So, for water you have

14.20

g

⋅

1 mole H

2

O

18.015

g

=

0.78823 moles H

2

O

and for carbon dioxide

34.71

g

⋅

1 mole CO

2

44.01

g

=

0.78868 moles CO

2

Now, you know that every mole of water contains 2 moles of hydrogen and 1 mole of oxygen, which means that the reaction produced

0.78823

moles H

2

O

⋅

2 moles H

1

mole H

2

O

=

1.5765 moles H

SInce every mole of carbon dioxide contains 1 mole of carbon and 2 moles of oxygen, it follows that the reaction also produced

0.78868

moles CO

2

⋅

1 mole C

1

mole CO

2

=

0.78868 moles C

Finally, to FIND the mole ratio that exists between carbon and hydrogen in the hydrocarbon, divide these values by the SMALLEST one

For C:  

0.78868

moles

0.78868

moles

=

1

For H:  

1.5765

moles

0.78868

moles

=

1.999

≈

2

Answer:

The indicator Fe3+ (FERRIC ion) is then added and the solution is titrated with the POTASSIUM thiocyanate solution. ... This method is USED when the pH of the solution, after the SAMPLE has been prepared, is acidic. If the pH is neutral or basic, Mohr's method or the gravimetric method should be used.

ANSWER:

NCERT I THINK so ACCORDING to me

ANSWER:

NAMES

Preferred IUPAC name Benzene

Other names Benzol (historic/German) Cyclohexa-1,3,5-triene; 1,3,5-Cyclohexatriene [6]Annulene (not recommended)

Identifiers

CAS NUMBER 71-43-2

ANSWER:

This method determines the CHLORIDE ION concentration of a solution by titration with SILVER nitrate. As the silver nitrate solution is SLOWLY added, a precipitate of silver chloride forms. The end point of the titration occurs when all the chloride ions are precipitated.

<STRONG>ANSWER:

yes

Explanation:

and strong FORCE of ATTRACTION

USES of metals are following

1- for windows

2- any construction

3- for jwellery

uses of non metals

1- for burn

2 - for respiration

3- for FOOD

Answer:

CHARCOAL is the charred product from pyrolyzing wood. CARBON is found as GRAPHITE and diamond and has no intrinsic filtering properties. Charcoal is a porous material that can BURN or adsorb pollutants. ... Activated carbon is usually of higher quality than activated charcoal, but the WORDS are often used interchangably.

Answer:

Given that,

Emf of cell = 0.059 V

The equation is

X(s)+2Y+(aq)\rightleftharpoons X_{2}+(aq)+2YX(s)+2Y+(aq)⇌X

2

+(aq)+2Y

Here, N = 1

We need to CALCULATE the value of CONSTANT K

Using formula of emf of the cell

E=\dfrac{2.303 RT}{nF}\LOG(K)E=

nF

2.303RT

log(K)

E=\dfrac{0.0591}{n}\log(K)E=

n

0.0591

log(K)

Where, E = emf of the cell

k = constant

Put the value into the formula

0.059=\dfrac{0.0591}{1}\log(K)0.059=

1

0.0591

log(K)

log(K)=\dfrac{0.059}{0.0591}log(K)=

0.0591

0.059

k=e^{1}k=e

1

k = 2.7\approx 3k=2.7≈3

Hence, The value of constant K is 3.

The EARTH's organisms interact with their environment in a delicately balanced cycle. Plants use ENERGY from the sun, and they become food for other creatures. The cycle continues as plant and animal life forms die and get CONSUMED by microorganisms. Bu this cycle of life is in jeopardy from humanity's OVERUSE of natural resources and damage to the ecosystem from pollution. Read on to learn more about maintaining balanced ecosystems.

First, a PALE BLUE precipitate of CUPRIC hydroxide is formed which is found to be soluble when excess of ammonia gas is passed through the solution, and dissolves to form a deep blue or inky blue colouration.

The complex unstable ION that is formed in this case is [Cu(NH3)4] +2

The deep blue or inky blue colouration consists of [Cu(NH3)4]Cl2 in dissolved form.

The reactions taking place are:

NH3 + H2O-------> NH4OH

CuCl2 + NH4OH--------> Cu(OH)2 + NH4Cl

Cu(OH)2 + 2NH4OH + 2NH4Cl---------> [Cu(NH3)4]Cl2(inky blue) + 4H2O

ANSWER:

दर्शाइए कि घनीय क्रिस्टल में सममिति के कुल 23 तत्व होते हैं

Answer:

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EXPLANATION:

MOLALITY is a property of a solution and is DEFINED as the number of moles of solute per kilogram of solvent. The SI unit for molality is mol/kg. A solution with a molality of 3 mol/kg is often described as “3 molal” or “3 m.” However, FOLLOWING the SI system of UNITS, mol/kg or a related SI unit is now preferred.

ANSWER:

The main difference between EQUIVALENCE and ENDPOINT is that the equivalence point is a point where the chemical reaction comes to an end while the endpoint is the point where the COLOUR change occurs in a system.

Explanation:

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ANSWER:

MILK and STARCH solution

Explanation:

This is because of It SHOWS tyndell EFFECT.

ANSWER:

Clean a platinum or NICHROME (a nickel-chromium ALLOY) wire by dipping it into concentrated hydrochloric acid and then holding it in a hot Bunsen flame. Repeat this until the wire produces no COLOR in the flame.

...

Flame Tests.

Element color

Barium pale green

Copper blue-green (often with WHITE flashes)

Lead gray-white

ANSWER:

no ,

EXPLANATION:

METALS which are soluble in water are CALLED alkalii

EXPLANATION:

(a)v.e. of boron is 1

(B)v.e of neon is 8

(C)v.e of Rubhidium is 9

(d)v.e of Barium is 28

ANSWER:

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(a)The atomic NUMBER of ELEMENT with electronic CONFIGURATION 2,8,7=17.

(B)It has 7 valence electrons, therefore it would be chemically similar to F(9)=2,7.

Answer:

there is no oxident

because ITZ not redox reaction

because no other compound TAKE oxygen from other COMPOND

Answer:

yes they EXISTED in NEWLANDS LAW of OCTAVES

<P>ANSWER:

The new pressure inside the container is 9 atm

Explanation:

Combined gas law is the COMBINATION of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

T

1

P

1

V

1

=

T

2

P

2

V

2

where,

P_1P

1

= initial pressure of gas = 1.5 atm

P_2P

2

= final pressure of gas = ?

V_1V

1

= initial volume of gas = 9.0 L

V_2V

2

= final volume of gas = 3.0 L

T_1T

1

= initial temperature of gas = 300 K

T_2T

2

= final temperature of gas = 600 K

Now put all the given values in the above equation, we get:

\frac{1.5atm\times 9.0L}{300K}=\frac{P_2\times 3.0L}{600K}

300K

1.5atm×9.0L

=

600K

P

2

×3.0L

P_2=9atmP

2

=9ATM

ANSWER:

EXPLANATION:

a=v-u/t  (Formula of ACCELERATION)

at=v-u

at+u=v   ( i.e v=u+at)

HENCE PROVED

ANSWER:

The acidity of bases: The number of HYDROXYL ions which can be produced per molecule of the base in AQUEOUS solution. Basicity of acid: The basicity of an acid is defined as the number of HYDRONIUM ions that can be produced by the ionization of ONE molecule of that acid in aqueous solution.

EXPLANATION:

ऐसी संख्या जो किसी परमाणु में उपस्थित इलूक्ट्रान के कोश , उपकोश , कक्षक और इलेक्ट्रॉन कि चक्रण की दिशा को व्यक्त करता है,उसे क्वांटम संंख्याए कहते हैं।

ANSWER:

The number of nucleons (both PROTONS and neutrons) in the NUCLEUS is the atom's mass number, and each isotopeof a given element has a different mass number. For example, carbon-12, carbon-13, and carbon-14 are three isotopes of the element carbon with mass NUMBERS 12, 13, and 14, respectively.

Explanation:

iupac STANDS for international PURE and applied chemistry

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Soft chemistry (also known as chimie douce) is a type of chemistry that uses reactions at ambient TEMPERATURE in open reaction VESSELS with reactions similar to those occurring in biological systems.

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At ordinary TEMPERATURES the SURFACES of METALS LIKE Magnesium, Aluminium and Zinc are covered with a thin layer. This layer is important because it prevents the further oxidation of the metal and helps in PROTECTING the metal from getting tarnished.

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ANSWER:

(2) It is USED for manufacture of detergent.

Explanation:

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ANSWER:

OPTION (a) is RIGHT answer

Answer:

no other natural substances are harder than diamond

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ANSWER:

a) SOLUTION of SUGAR in WATER

answer

(2) 351.6

Explanation:

GIVEN, z=2,d=0.53gcm

−3

MOLAR MASS m=6.94

⇒a

3

=

dN

A

ZM

⇒a

3

=

0.53×6.022×10

23

2×6.94

⇒a

3

=4.38×10

−23

⇒a=0.3516×10

−7

cm≃351.6pm

Hence, edge of unit cell is 351.6pm.

Answer:

magnesium

Explanation:

that is why magnesium RIBBON has a silvery COATING on its SURFACE when left EXPOSED to air

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Answer:

Amorphous solid has short range order which has a tendency to flow very SLOWLY. Hence, it is also known as pseudo solids or super cooled liquids.

EXPLANATION:

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ANSWER:

NO 2 IS THE ANSWER........

EXPLANATION: