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N2 has mass = 14 , this should be no. one ✓O atom has mass = 8

option 1 is correct.

CH3CH2OH (conc.h2so4/443k)->CH2=CH2 + H2O

This reaction is dehydration reaction. In this reaction conc. H2SO4 acts as dehydrating agent.

ZnO + 2NaOHgivesNa2ZnO2+ H2O

2HNO3 + CaCO3 → Ca (NO3)2 + CO2 +H2O

where is the answer

where is the answer

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When dialysis is prolonged the traces of electrolyte which stabilies the colloids are removed completely. This makes the colloid unstable and therefore coagulationtakes place.

three state of matter are solid liquid and gas

2. three states of matter are:*solid *liquid*gas

Equation for the same is:

BaCl2(aq) + Na2SO4⇨ BaSO4(s) + 2NaCl (aq)

thank u

Na2SO4+BaCl2→2NaCl+BaSO4Na2SO4+BaCl2→2NaCl+BaSO4

As the reaction proceeds, the mixture will gradually turn cloudy. The reaction will produce Barium sulfate which is aninsoluble white precipitate.Thus the mixture will be clear at the start of the reaction and gradually turn white and cloudy.

Sodium acetate

When acetic acid reacts with sodium hydroxide, sodium acetate is formed.

Since, sodium hydroxide is stronger base than acetic acid, thus salt (sodium acetate) formed in this neutralization reaction is basic in nature and its pH value is more than 7. This happens because acetic acid does not neutralize sodium hydroxide completely.

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Li has only one electron in its outermost orbit due to which the ionization enthalpy is less than that of any plus which has fulfilled outer orbital that is have reached the state of octet. hence the formation of Li + ion is easier than that of Ne + ion.

A is correct and because it is notelectrophile

option A is a correct answer

option A is the correct answer

I feel option A is right.

option ANo2is correct answer

A is the correct answer

Option B is write answer

Ans :- The keydifference between redand white phosphorusis that thered phosphorus appears as darkredcolored crystals whereas the whitephosphorusexists as a translucent waxy solid that quickly becomes yellow when exposed to light. Phosphorusis a chemical element that occurs in several different allotropes.

option

There's a formula for hybridization: S = (1/2)*|G + M - C + A|, || means absolute value, G=number of valence electrons, M=number of monovalent atoms attached to central atom, C = cationic charge of ion(if any), A = anionic charge.

S = 4, sp3 hybridizedS = 3, sp2 hybridizedS = 2, sp hybridizedS = 5, sp3d hybridizedand so on....

BF4- : G = 3, M = 4, A = 1, C = 0.'. S = (1/2)*|3+4+1| = 4i.e. sp3 hybridized!

A temperature above which a gas cannot be liquifies is called critical temperature. Denoted as Tc , where Pc is critical pressure and Vc molar critical volume.Now ,R = 0.082 L atm K-1 mol-1Vc=3b ( according to ideal gas equation )and b =RTc/8Pc= 0.1 Lmol-1Vc = 3*RTc/8Pc

=> Vc = 3*400R/8*41 = 150R/41

Z is a constant, known as "electro chemical equivalent" of the substance. If one ampere of current is passed for one second; then w = Z. This means when one ampere of current is passed for one second; then the weight or amount of the substance deposited or liberated is exactly equal to its electrochemical equivalent. The current in ampere, multiplied by the time in second is known as coulomb which is the electric charge.Electrochemical equivalent of a substance may be defined as the weight (amount) of the substance deposited or liberated, when one coulomb of electric charge is passed through an electrolyte. It is denoted by Z and in S.I unit it is expressed in Kg / coulomb. Each element has its own electrochemical equivale

how to prove E/96500=z

a. Diamond is the pure element

b. Sandis amixture.Sandis classified as a heterogeneousmixturebecause it does not have the same properties, composition and appearance throughout themixture.

c. Steel is an alloy, therefore it is a mixture. It is not an element because it is not on the periodic table. It is not a compound because theironandcarbonare not chemically bonded together.

A space lattice is an array of points showing how particles (atoms, ions or molecules) are arranged at different sites in three dimensional spaces.” ... The unit cell may be defined as, “the smallest repeating unit in space lattice which, when repeated over again, results in a crystal of the given substance

Asustainable management of natural resourcesisnecessarybecause : (1) It will help in the conservation of a replenishableresourcewhich otherwise may get depleted soon. (2) Depletion of oneresourcemay affect otherresourcesalso. (3) This will also prevent pollution and maintain our ecosystem.

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Option D is the answer

mechanical energyelectrical energysolar energychemical energy

→ Ionic bond is strong due to electrostatic forces of attraction whereas metallic bond may be weak or strong depending upon the number of valence electrons and the size of kernels→ In an ionic bond, ions are not free to move. Hence, they cannot conduct electricity in solid state. They can do so only in the molten state or in aqueous solution.

Because most elements were discovered through their reactivity with other elements, typically with oxygen, it was difficult for scientists to work with a substance that seemed to have little or no chemical properties based upon the lack of reactivity.

(C2H5)3N > (C2H5)2NH > NH3

3 degree 2 degree 1 degree

This is a matter of scale conversions. In a problem dealing withpressure, it is reasonable to use a scale of One AtmosphericPressure = 1.013 × 105 N/m2 = 760 mm Hg for conversions. Note theconvenience in appropriate scale choice. If an inappropriate scale hadbeen chosen, another conversion to some other scale would be neededbefore converting to the desired scale. Since 1.013 × 105 N/m2 isequivalent to 760 mm Hg, therefore 1.00 × 105 N/m2 will be equivalent to [(1.00 × 105 N/m2) / (1.013 × 105 N/m2)] × 760 mm Hg = 750 mm Hg.

The top members of the groups of representative elements show anomalous behavior due to the following reasons:

1. They have very small size.2. They are very much electropositive in case of 1st 4 groups and very much electronegative in case of group 5 onwards.3. They do not have d orbitals.Hope it helps.

So that it can undergo complete combustion by providing sufficient amount of oxygen so that it can burn with blue clean flame instead of yellow sooty flame.

Potassium ferrioxalate

it is physical change

it is a physical change

it is a physical change as properties of paper remains the same

It is a chemical change because only the size of paper change during tearing

it is physical change. because if a paper tear but this is also a paper

the temperature at which solid changes to liquid is called its fusion or melting point

the temperature at which a solid change into Liquid is called melting point of substance

Toothpaste is alkaline in nature.

The action of bacteria occurs in acidic medium in the mouth and hence toothpaste neutralises the acid and doesn't allow tooth decay to occur.

The appearance of water droplets at the tips and edges of the leaves of a plant is caused by a secretory process calledguttation. It often occurs under conditions of moist soil, high humidity, and relatively cool air and it usually occurs in the early morning.

We usually perform Electrolysis to split constituents of water . Water composition is 2atoms of H and 1atom of O . Therefore H is double than O . 4H + O2 = 2H2O The two electrodes collect H and O separately . We know that hydrogen composition in water is double than oxygen , so we find volume of gas collected in one electrode is double than volume of gas collected in another electrode .

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Normality of resulting solution= N1V1+N2V2/V1+V2

Since V1/V2=1/2 = V2=2V1(substituting it in the above given equation)

N1=0.45 N, V1=V1 ; N2=0.60,V2=2V1.

Now, 0.45*V1+0.60*2V1/V1+2V1

= 0.45V1+1.20V1/3V1

= 1.65 V1/3V1 (V1 gets cancelled)

=0.55 N

Tooth decay (also called cavities or caries) is caused by bacteria in the plaque on your teeth, sweet foods and drinks, and a lack of oral hygiene. It can harm your teeth and cause a lot of pain, and may even result in tooth loss.

the ability to bear teeth in sweet is very simple .so sweet runs the outer layer of teeth by causing decay in our teeth and tooth paste cleaning tooth paste has the ablity to stop the cavity of teeth. which makes teeth in the outer layer of tooth stop doing

as CO2gas which is dissoved in the drink at very high pressure gets undissolved and occupy the surface above water inside the bottle.Excessive pressure due to this gas may lead to dangerous explosion.Hence the bottles are kept in water so as to lower the temperature and keep the CO2 gas dissolved in the drink

I need kept under water

read answer carefully..3rd last line.. kept in water and kept under water..is same right ?

There are basically two things -

Sodium Bicarbonate (NaHCO₃) -Also known as baking soda .Sodium Carbonate(Na₂CO₃.) - Also known as washing soda.If we talk about its formation ,we know Na has 1 electron which it can give and carbonate CO₃ has affinity to accept two electrons.Thus, we get the chemical formula -Na₂CO₃.

(D) the mean of age of remaining girls is 13.8 years

answer:(D)13.8 years

D option is correct 13.8

d is the correct answer i.e 13.8

option D is the correct answer

is the correct answer D) 13.8 years

option d is the correct answer