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OH- is the stronger base because its conjugate Acid which is H + is a strong acid.

acid rain case by the harmful effects of camicle

Acid rainis arainor any other form ofprecipitationthat is unusuallyacidic, meaning that it has elevated levels of hydrogen ions (lowpH). It can have harmful effects on plants, aquatic animals and infrastructure. Acid rain is caused by emissions ofsulphur dioxideandnitrogen oxide, which react with thewater moleculesin theatmosphereto produce acids. Some governments have made efforts since the 1970s to reduce the release of sulphur dioxide and nitrogen oxide into the atmosphere with positive results. Acid rain has been shown to have adverse impacts on forests, freshwaters and soils, killing insect and aquatic life-forms as well as causing damage to buildings and having impacts on human health.

Aa we know spring balance measures weight of body .hence when we put the substance in waterthe force of buoyancy reduces the net weight of that body and hence the spring balance shows a decrease.

1)ethoxyaceticacid2)cyclohex-1,3-diene

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1. Cotton, Silk2. Silk, wool, DNA, cellulose and proteins3. Rayon4.Acrylic5.Melamine formaldehyde resinis thepolymer

1.cotton, silk2.silk,dna,cellulose3.rayon is also known as artificial silk4.Acrylic5.melamine formaldehyde resin is the used polymer

When you dissolve an acid or base in water, it makesions. This makes the water conduct electricity better.

The stronger the acid (or base), the more ions are produced, so the conductivity of the solution increases.

They can both conduct electricity.

When an acid reacts with a base, a salt is formed

they both can carry and share ions

It is easier tosip hot teaor milkfaster from a saucer rather than from a cup because of evaporation . ... And evaporation causes cooling. So if the surface area is more rate of evaporation isfasterand so is the cooling rate. Henceweareable to sip hot teaor milkfasterfrom a saucer rather than from a cup

because of its surface area evaporation takes place according to surface area

We are able to sip hot tea or milk faster from a saucer rather than from a cup because saucer has a larger surface area due to which evaporation occurs faster. The vapours take up the latent heat from hot milk or tea kept in the saucer faster, than in a cup which has a smaller surface area than the saucer and make the contents of the saucer cool down faster

1.They are of small size.2) They are in continuous motion because they possess high kinetic energy.3) They occupy space4) They attract each other due to high intermolecular forces

Conclusion of Rutherford's scatteringexperiment: 1)Most of the space inside the atom is empty because most of the α-particles passed through the gold foil without getting deflected.

2)Very few particles were deflected from their path, indicating that the positive charge of the atom occupies very little space.

3)A very small fraction of α-particles were deflected by very large angles, indicating that all the positive charge and mass of the gold atom were concentrated in a very small volume within the atom

Surprisingly one out of every 12,000 alpha particles appeared to rebound.

It behaves like base because in acid medium, O atom can donate its Lone pair e to accept H+ ion.

small number ofalpha particlesweredeflectedby large angles (> 4°) as they passed through thefoil. There is a concentration of positive charge in the atom. Like charges repel, so the positivealpha particleswere being repelled by positive charges.

Zinc sulfidecan detect alphaparticles.

In an experiment, Thealpha particlesweredetectedby a zinc sulfide screen, which emits a flash of light upon analpha particlecollision.

alpha particles can be detected by using ratheford model

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The two main characteristics features of matter are :-(i) It occupies space .(ii) It has mass and volume .

The characteristics of matter are:-

1⃣Particles of matter have space between them.

2⃣Particles of matter are continuously moving.

3⃣Particles of matter attract each other.

it occupied spaceit have massit is smallest particle

it occupies space and has a mass.it's presence can be feel by one of our five senses.

Theoctet ruleis a chemicalruleof thumb that reflects observation that elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.

Ans :- A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

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Liebig's method is used for the estimation of "Carbon and hydrogen".A known mass of organic compound is heated in the presence of pure oxygen. The carbon dioxide and water formed are collected and weighed. The percentages of carbon and hydrogen in the compound are calculated from the masses of carbon dioxide and water. Estimation of carbon and hydrogen in an organic compound is based on their conversion to CO and H2O respectively.

Ans :- A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

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Number of iron atoms present in haemoglobin is 4.

pπ-pπ bond is found in oxacids of chlorine.

Ch3 Clcoz it will cause high+I effect

option D should be correct because Cl is most electronegative out of all these

Because of the difference in electronegativity between Hydrogen and Oxygen, the single bonds between them are polar, with a partial negative charge on oxygen and partial positive on Hydrogen. Since Oxygen has the same electronegativity as itself, there is no difference in polarity across the bond, so it isnonpolar.option 4

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Rx 2NH3 = N2 + 3H2

Initial mole= 2 0 0

Final Mole = 1 1/2 3/2

Equilibrium constant = 3/2*3/2*3/2*1/2= 27/16 ans

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snigdha

An olfactory indicator is a substance whose smell varies depending on wether it's mixed with acidic solution or basic solution.

when gypsum(CaSO4.2H2O) is heated to about 100 degree celcius it loses some of water of crystallisation and is converted to platter of Paris.

soap is for bathing and contains no harmful chemicals

and detergent has harmful chemical and for wasting clothes

[(4+6)5+3(3÷2)+(3*2)][10*5+9/2+6][50+9+12/2][50+21/2]100+21/2121/2

here, is the solution for a similar ques.just substitute the numeeical values of your doubt and proceed accordingly

A 6.9 M solution of KOH in Water contain 30% by mass of KOH what is the density of the solution

Molar mass of NaOH= 40g per mole

No. of moles in 5g of NaOH = 5/40 = 0.125

Volume of solution= 450mL=0.45L

Molarity of solution= No.of moles of solute/ volume of solution= 0.125/0.45= 0.28

Na+ is smaller than Na

tq

Na+ as it has 1e- less than Na

There are five known phases, or states, of matter: solids(ice), liquids, )water)gases(air),plasmaand Bose-Einstein condensates. The main difference in the structures of each state is in the densities of the particles.

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As per the equation 2 moles of Mg require 1 mole of O2hence 10 moles would require 5 moles of O2

The chemical equation for the said reaction is,

C2H4+12×2+4=283O296→2CO2+2H2O

the gram molar weight of ethylene is= 12*2+1*4 g =28gthe gram molar weight of oxygen = 3*32 g =96 g∵The weight of oxygen required for complete combustion of 28 g ethylene =96 gaccording to question,

∴ Weight of oxygen required for combustion of 2.8 kg ethylene =96×2.8×100028×1000kg =9.6kgThat is the answer.

Molecular weight of Na=23hence moles=amount given/molecular mass=46/23=2 moles.

let the volume of methane be a and Ethane be b.

CH4 + 2O2 ---> CO2 + 2H2O a 2a a 2a

C2H4 + 3O2 ------> 2CO2 + 2H2O b 3b 2b 2b

now a+b = 12

and a+2b = 19 ,

so, a+2b-(a+b) = 19-12 = 7=> b = 7ml , and a = 5 ml

volume of methane = 5 ml and ethane = 7 ml

follows :

C2H4+ 3O2→ 2CO2+ 2H2O

1 vol 2 vol.

CH4+ 2O2→ CO2+ 2H2O

1 vol. 1 vol

Let the vol. of CH4in mixture = xl

∴ Vol. of C2H4in the mixture = (3.67 - x)l

Vol. of CO2produced by xlof CH4= xland

Vol. of CO2produced by (3.67 - x)lof C2H4= 2(3.67 - x)l

∴ Total vol. of CO2produced = x + 2 (3.67 - x)

Or 6.11 = x + 2(3.67 - x) or x = 1.23l

∴ Vol. of CH4in the mixture = 1.23l

and Vol. of C2H4in the mixture = 3.67 – 1.23 = 2.44l

Vol. of CH4per litre of the mixture = 1.23/3.67 = 0.335l

Vol. of C2H4per litre of the mixture = 2.44/3.67 = 0.665 l

Now we know that volume of 1 mol. Of any gas at 25°C (298 K) = 22.4 * 298/273 = 24.45l

[∵ Volume at NTP = 22.4L]

Heat evolved due to combustion of 0.335lof CH4= - 0.335 * 891/24.45 = - 12.20 kJ [given, heat evolved by combustion of 1l= 891 kJ]

Similarly, heat evolved due to combustion due to combustion of 0.665lof C2H4

= - 0.665 * 1423/24.45 = - 38.70 kJ

∴ Total heat evolved = 12.20 + 338.70 =50.90 kJ