Explore topic-wise InterviewSolutions in Current Affairs.

Answer:

precision is observations close to the value of observer itself

ACCURACY is OBSERVATION which ISS very very close to TRUE value

in the above question

19.2 19.4 19.8 are PRECISE values that is close to one value

18.7 is neither accurate nor precise

20.5 is nearby accuracy

EXPLANATION:

Rutherford's model shows that an ATOM is MOSTLY EMPTY space, with electrons ORBITING a fixed, positively charged nucleus in set, predictable paths. This model of an atom was developed by Ernest Rutherford, a New Zealand native working at the University of Manchester in England in the early 1900s.

ANSWER:

ATTRACTIVE FORCE TOWARDS the ELEMENTS

ANSWER:

H = +1 , O = -2

Oxidation no. of H2 here is +2

But usually while writing oxidation no.we write that of a SINGLE ATOM.

So, it is +1. And oxidation no. of O is always -2.

heyyy....

Dalton's atomic theory proposed that all matter was composed of ATOMS, indivisible and indestructible BUILDING blocks. While all atoms of an ELEMENT were IDENTICAL, DIFFERENT elements had atoms of differing size and mass.

CL- ION= 18 e-

1s² 2s² 23s² 3

where l=1;m=-1

Answer:

6×6.022×10^23 MOLECULES

Answer:

structure of ClF4 is irregular tetrahydral or SEE SAW and structure of BRF5 is square pyramidal or pentagonal pyramidal

Explanation:

HEY mate

Just REVISION.. The best KEY of EVERYTHING

Answer:

Explanation:

Atomic MASS of MAGNESIUM is 24g

Oxygen is 16

Mass of MGO is 40 grams

Therefore 240g/40g=6 moles

1 mole of mg REQUIRES 1/2 mole of o2

6 moles requires 3 moles of o2

Answer:

ionic %= miu(GIVEN)*100/miu(to CALCULATE)

Explanation:

so in your CASE, 25= miu(given)*100/miu(VARIABLE)

Answer:

MAKE SHORT forms or make some catchy sentences with the initials of every LETTER in the ORDER of group or period and revise them everyday , it will surely help

ETHYL PENTANE........

i don't KNOW PERFECTLY.

ANSWER:

wjjwjwsj hwjwjwjwjwjwjw

ANSWER:

it was in 3 d so. it can more any DIRECTION but in there ORBIT

ANSWER:

YES yes yes yes yes yes yes yes yes yes

ANSWER:

(4) C-O

Explanation:

IODINE is a non-metallic, dark-gray/purple-black, lustrous, solid ELEMENT. Iodine is the most ELECTROPOSITIVE HALOGEN and the least reactive of the halogens even if it can still form compounds with many elements. ... Iodine dissolves in some solvents, such as carbon TETRACHLORIDE and it is only slightly soluble in water.

Answer:

Sodium sulfate is a very stable and happy molecule. What it does love is water, which is why it is commonly used in chemistry labs (especially in organic chemistry) to “dry” liquids. I am using the chemistry meaning of dry which is “not containing water”. It is readily hydrated and can be removed from your liquid with a simple filtration.

Sodium SULFITE is relatively stable but no where near as stable as the sulfate. It craves that extra oxygen so even if you leave it exposed to air it will slowly oxidize to give sodium sulfate. If you left your aqueous sodium sulfite solution open on the side, atmospheric oxygen would CAUSE the chemical change, the water would hydrate the new compound and the slow evaporation of water would give you lovely large CRYSTALS of Na2SO4 without you having to do anything!

If you wanted to speed up this process you COULD bubble some O2 into a water solution. If you really wanted it to go rapidly I GUESS you could add an oxidizing agent like hydrogen peroxide. You wouldnt have to worry much about purification either if you did that. You can speed up crystal growth by exposing the sample to a vacuum or cooling it down (not really much good with water!)

I hope this helps!

ANSWER:

MG+HNO3~mg(NO3)2+no2+h2o

Explanation:

mg+(hno3)6~mg (no3)2+no2+h2o

thats WRONG

Answer:

the degree of oxidation of an atom or ion or molecule, for simple ATOMS or IONS the oxidation NUMBER is equal to the ionic CHARGE .

oxidation no hydrogen is +1

and oxidation no of oxygen is -2.

Answer:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and CONTAINS avogadro's number of particles.

Standard CONDITION of temperature (STP)  is 273 K and ATMOSPHERIC pressure is 1 atmosphere RESPECTIVELY.  

According to the ideal gas equation:

P = Pressure of the gas = 1 atm

V= Volume of the gas = ?

T= Temperature of the gas = 273 K      

R= Gas constant = 0.0821 atmL/K mol

n=  moles of gas= 1

Thus at STP one mole of gas occupies a volume of 22.4 liters.

ANSWER:

THE ANSWER TO THIS QUESTION IS 16/(7R) WHERE R IS RYDBERG CONSTANT

Explanation:

In the paschen series the ELECTRONS have a transition from various electronic levels to a lower energy level of n=3.

To compute the wave number that is the inverse of wavelength we use the FORMULA

1/λ=RZ^2([1/n1^2]-[1/n2^2])

here n1=3 and n2=4 as the transition between two successive ORBITS  involves low energy difference thereby huge wavelength from the formula

E=hc/λ

thereby computing

1/λ=R×9[{1/9}-(1/16)]

1/λ=R×7/16

⇒λ=16/7R

Answer:

8, Helium (He)

Explanation:

noble gases have 8 ELECTRONS in OUTERMOST shell because they have completed the octet. Except Helium i.e. He has 2 electrons in the outermost shell. it is said to have completed DUPLET which is also a stable state

Explanation:

Advantages of Mixed farming: Farmers can keep their fields under CONTINUOUS production. There is reduction in the need of artificial fertilizers which can OTHERWISE be expensive. There is geographic mixing of CROPS; this can help SLOW the spread of pest and other diseases in the GROWING season

EXPLANATION:

air is having some particles to COMPOSE to air like silver JEWELLERY is composed to air it doesn't react with air

ANSWER:

CONDUCTION OF CURRENT IN WATER

Explanation:

because the water is good conductor of electricity because it has AQUAS oxygen (o2)+H2O that why it CONDUCT the current in H2O

Answer:

7 ORBITALS is AVAILABLE for any ENERGY LEVEL

Answer:

BENZENE REACTS with conc.sulphuric ACID and conc.nitric acid to give NITRO benzene. This nitro benzene on bromination in the presence of anhydrous AlCl3 gives m-nitrobromobenzene. As nitro group is META-directing it directs the bromo group to meta position.

Answer:

a]Hydrogenation reaction:

Hydrogenation, chemical reaction between molecular hydrogen and an element or compound, ordinarily in the presence of a catalyst. The reaction may be one in which hydrogen simply adds to a double or triple bond connecting two atoms in the structure of the molecule or one in which the addition of hydrogen RESULTS in dissociation (breaking up) of the molecule (called hydrogenolysis, or destructive hydrogenation). Typical hydrogenation reactions include the reaction of hydrogen and nitrogen to form ammonia and the reaction of hydrogen and carbon monoxide to form methanol or hydrocarbons, depending on the choice of catalyst.

The catalysts most commonly used for hydrogenation reactions are the metals nickel, platinum, and palladium and their oxides. For high-pressure hydrogenations, copper chromite and nickel SUPPORTED on kieselguhr (loose or porous diatomite) are extensively used.

b]Oxidation reaction:

Oxidation is the loss of electrons during a reaction by a molecule, atom or ion.

Oxidation occurs when the oxidation state of a molecule, atom or ion is INCREASED. The opposite process is called reduction, which occurs when there is a gain of electrons or the oxidation state of an atom, molecule, or ion decreases.

An example of a reaction is that between hydrogen and fluorine gas to form hydrofluoric acid:

H2 + F2 → 2 HF

In this reaction, hydrogen is being oxidized and fluorine is being reduced. The reaction may be better understood if it is written in terms of two half-reactions.

H2 → 2 H+ + 2 e-

F2 + 2 e- → 2 F-

Note there is no oxygen anywhere in this reaction!

c]Substitution reaction:

Substitution reaction (also known as single displacement reaction or single substitution reaction) is a chemical reaction during which one functional group in a chemical compound is replaced by another functional group.[1][2]Substitution reactions are of prime importance in organic chemistry. Substitution reactions in organic chemistry are classified either as electrophilic or nucleophilic depending upon the reagent involved. There are other classifications as well that are mentioned below.

Organic substitution reactions are classified in several main organic reaction types depending on whether the reagentthat brings about the substitution is considered an electrophile or a nucleophile, whether a reactive intermediateinvolved in the reaction is a carbocation, a carbanion or a free radical or whether the substrate is aliphatic or aromatic. Detailed understanding of a reaction type helps to predict the product outcome in a reaction. It also is helpful for optimizing a reaction with regard to variables such as temperature and choice of solvent.

A good example of a substitution reaction is halogenation. When chlorine gas (Cl-Cl) is irradiated, some of the molecules are split into two chlorine radicals (Cl.) whose free electrons are strongly nucleophilic. One of them breaks a weak C-H covalent bond and grabs the liberated proton to form the electrically neutral H-Cl. The other radical reforms a covalent bond with the CH3. to form CH3Cl (methyl chloride).

d]SAPONIFICATION reaction:

Usually, saponification is a process by which triglycerides are reacted with sodium or potassium hydroxide (lye) to produce glycerol and a FATTY acid salt, called 'soap'. The triglycerides are most often animal fats or vegetable oils. When sodium hydroxide is used, a hard soap is produced. Using potassium hydroxide results in a soft soap.

Lipids that contain fatty acid ester linkages can undergo hydrolysis. This reaction is catalyzed by a strong acid or base. Saponification is the alkaline hydrolysis of the fatty acid esters. The mechanism of saponification is:

Nucleophilic attack by the hydroxideLeaving group removalDeprotonationSaponification Example

The chemical reaction between any fat and sodium hydroxide is a saponification reaction.

triglyceride + sodium hydroxide (or potassium hydroxide) → glycerol + 3 soap molecules

e]Combustion reaction:

A

Answer:

The electron CONFIGURATION is: , for a total of 15 ELECTRONS.

ANSWER:

OPTION 4

Explanation:

5s is having more than other DUE to N+ L

The MOLECULAR WEIGHT of HEMOGLOBIN is 16000 DALTONS

Answer:5.025

Explanation:

Answer:

wear a HELMET and black glasses.

keep AWAY from heat and fire.

do not PICK up THINGS which are fallen into fire.

practice a safe drill.

know what to do if you are CAUGHT in fire.

Explanation:

ANSWER:

HEY MATE

TELL the QUES no

Answer:32.370% is the MASS PERCENTAGE of Na2S04

Explanation:

Answer:

IODINE is non metal

Explanation:

it it is CONSIDERED because it is less REACTIVE than other metals

ANSWER:

the EMPIRICAL FORMULA =CH3

Molecular formula = C2H6

PLEASE MARK IT AS A BRAINLIEST ANSWER

ANSWER:

CHLOROFORM will COME up because it is having LOW DENSITY

ANSWER:

SODIUM HYDROXIDE PRODUCES s+ H2

ANSWER:

Explanation:

Ultraviolet LIGHT or by an APPROPRIATE spray REAGENT

ANSWER:

yes

this is STABLE by the RULE of DUPLET

Answer:

Explanation:

1s <2s <2p <3s <3p<4s<3d<4p<5S<4d<5P<6s<4f<5d<6p<7s<5f<6D<7p

ANSWER:

PLS visit

https://www.askiitians.com/blog/back-benchers-tip-learn-periodic-table/

to GET you answer

ANSWER:

and is AMMONIUM chloride

hope it HELPS u

plzzzzzz GIVE me thanks

plzzzzzz FOLLOW me

Explanation:

FRANCIUM – APPROXIMATELY $1 billion PER gram. ...

Californium – $25 million per gram. ...

Carbon – $65k per gram. ...

Plutonium – $4k per gram. ...

SCANDIUM – $270 per gram.

Explanation:

The Aufbau principle, SIMPLY put, means electrons are ADDED to orbitals as protons are added to an atom. The TERM COMES from the German WORD "aufbau", which means "built up" or "construction". ... The end result is that the atom, ion, or molecule forms the most stable electron configuration

Answer:

THE ANSWER TO THIS QUESTION IS THE USAGE OF "AZEOTROPIC DISTILLATION METHOD"

Explanation:

The mixture of benzene and acetone cannot be separated by using any other distillation methods because of their similarities in boiling points.If distillation is used then the mixture starts to BOIL as a whole that is BEHAVES like a single COMPONENT thereby making it HIGHLY impossible to separate.This mixture so obtained by the distilling is called a "constant boiling mixture" .

And these type of mixtures are called azeotropes .

Now to separate them we add another ORGANIC compound which has a property to dissolve only one of the compounds of the mixture thereby the other being separated when heat is added.

These compounds are called "entrainers".

Examples of entrainers in separation of benzene and acetone includes toulene.