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Gypsum chemical formula is CaSO4.2H2O whereas on the other hand chemical formula for the plaster of Paris is CaSO4.1/2H2O.

On heating, the gypsum at 373 K plaster of Paris is formed which is mostly used by the doctors for the treatment like fractures, sprain, etc. this is due to the properties of plaster of paris which is paitentent gets faster relief from the pain.

(1) C6H5OH + 3Br2 --H2O--> C6H2Br3OH + 3HBr

(2) 12(CH2)6N4 + 16H3BO3 + 27H2O + 9C6H5OH -----> 16(NH4)3BO3 + 18C6H4(OH)CHO

Solids have a higher density and the speed of sound depends on the density of the medium.

When an Ideal gas is expanded into vacuum, it does no work. (W =0) Hence, no change in the internal energy and thus in the temperature of the gas.This means the q = 0, change in internal energy and enthalpy are also zero.Hence, Option (4) is correct.

absolute refractive index is (speed of light in vacuum)/speed in medium= 3*10^8/1.5×10^8= 2

C H 3 8

CH2=CH-CH2-C≡C-CH3

option 3

2 option is the correct one. the value of Kp for the reaction is 2/8 of pressure

2nd optoin is correct answer

2nd option is correct as value of kp is always 2/8 of pressure of the systen

option 2 is correct answer.

The main chemicals in air pollution that create acid rain are sulphur dioxide (SO2) and nitrogen (NOx). Acid rain usually forms high in the clouds where sulphur dioxide and nitrogen oxides react with water, oxygen, and oxidants. this mixture forms a mild solution of sulphuric acid and nitric acid.

Therefore, Sulphuric acid and Nitric acid are usually present in rain water.

sulphuric dioxide and nitrogen oxides

sulper dioxide, nitrogen dioxide

Nitrous acid and Sulphurous acid

let parts are sepereted at a distance of d

so repulsion force F= k q(Q-q)/d2

here Q and d are constant so for maximum force differentiate the force w.r.t q

dF/dq = k/d2[Q -2q]

for maximum force dF/dq=0

Q-2q=0

Q/q =2

the value of Kp/kc = (RT)^{∆n} here , ∆n = 1-2 =-1 ( 1 mole of gas in product side - 2 mole at reactant side.) so Kp/kc = (RT)^{-1} therefore Kp/Kc = 1/RT option D.

According to basicity Acid can be divided into 3 types:1) Monobasic : Examples HCL ( Hydrochloric Acid)2) Dibasic : Examples H2SO4 (Sulphuric Acid)3) Tribasic : Examples H3PO4 (Phosphoric Acid)

a. . Mycobacterium tuberculosis

b. Measles virus

c. Wuchereria bancrofti,Brugia malayi,B. timori

d. Plasmodium falciparum

e. Trichophyton, Epidermophyton, and Microsporum

f. Vibrio cholerae

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option 4 is the answer.

A Lewis acid is therefore any substance, such as the H+ion, that can accept a pair ofnonbondingelectrons. Inotherwords, a Lewis acid is an electron-pair acceptor.hence Lewis ..option a is the answer

a. Mycobacterium tuberculosis

b. Measles virus

c. Wuchereria bancrofti,Brugia malayi,B. timori

d. Plasmodium falciparum

e. Trichophyton, Epidermophyton, and Microsporum

f. Vibrio cholerae

A. The atomic number is 12b. The valency of it is +2. It can donate electrons.c. Be because they both have same number of valence electron in their outermost orbit. Hence both are metals can donate electrons. And both lie in same group that is group 2 so they have same physical and chemical properties.

ALewis baseis any substance, such as the OH-ion, that can donate a pair of nonbonding electrons. ALewis baseis therefore an electron-pair donor. One advantage of theLewistheory is the way it complements the model of oxidation-reduction reactions.

A Lewis's base has a substance such sa OH ions

a Lewis base give a OH ion

A Lewis acid is a chemical species that contains an empty orbital which is capable of accepting an electron pair from a Lewis base to form a Lewis adduct.

ALewis baseis any substance, such as the OH-ion, that can donate a pair of nonbonding electrons. ALewis baseis therefore an electron-pair donor. One advantage of theLewistheory is the way it complements the model of oxidation-reduction reactions.

Lewis base is given OH

a Lewis base give a OH ion

Positive Resonance Effect-Positive resonance effect occurs when the groups release electrons to the other molecules by the process of delocalization. The groups are usually denoted by +R or +M. In this process, the molecular electron density increases. For example- -OH, -SH, -OR,-SR.

3)Lewis base is a substance that can donate an electrone pair.Those species having a lonepair always forms Lewis base so H-is a Lewis base as it possess a lone pair and can donate it.

2)Intermolecular forces are the forces which mediate interaction between molecules, including forces of attraction or repulsion which act between molecules and other types of neighboring particles, e.g., atoms or ions. ... Ion-induced dipole forces. Ion-dipole forces. Hydrogen bonding.

This is the H2SO3 Lewis structure:sulfurous acid. The key to understanding this Lewis structure is recognizing these two H's in front attached to a polyatomic ion. That makes it an acid. And theseOxygenshere, theHydrogenswill attach to the outside of theOxygens.

The relationship between mole fraction and molality is given as

m=1000 X xB/(1-XB)X Molecular weoght of solvent

The tricky part in this question is observing which is solute and solvent.

Mole fraction of water is 0.85 which means it is not the solute but it is the SOLVENT.

We know that mole fraction of solute+mole fraction of solvent=1

Therefore, xB=0.15

Substitute it in given equation,

1000(0.15)/(0.85)(18)

Which is equal to 9.8

The term "client software" is used to refer to the software that acts as the interface between the client computer and the server.

In computing, aserveris a computer program or a device that provides functionality for other programs or devices, called "clients."

a) Anatomis a fundamental constituent of a matter. Anatomitself is made up of three kinds of particles called subatomic particles: protons, neutrons, and electrons.

b)Atomicity is the total number of atoms present in one molecule of an element, compound or a substance.

For example oxygen O2 exists as diatomic means 2 atoms of oxygen are present.

Ans :- Inchemistry, conformational isomerism is a form of stereoisomerism in which the isomers can be interconverted exclusively by rotations about formally single bonds (refer to figure on single bond rotation). Such isomers are generally referred to as conformational isomers or conformers and, specifically, as rotamers.

The lowest energyconformation of ethane, shown in the figure above, is called the 'staggered'conformation, in which all of the C-H bonds on the front carbon are positioned at dihedral angles of 60°relative to the C-H bonds on the back carbon. Another 60°rotation returns the molecule to a second eclipsedconformation.

Iodine (I) is bonded to sp^2 hybridised carbon.

Bonded electron group =3Non-Bonded electron group =1

Difference =3-1=2

hence, I is sp^2 hybridised

option 4 is correct answer

Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance

An aqueous solution is a solution in which the solvent is water. It is mostly shown in chemical equations by appending to the relevant chemical formula. For example, a solution of table salt, or sodium chloride, in water would be represented as Na+ + Cl−.

it is a solution in which solute and solvent are present

Copper cofactoris a non-proteinchemical compoundormetallic ionthat is required for anenzyme's activity. Cofactors can be considered "helper molecules" that assist inbiochemicaltransformations. The rates at which these happen are characterized byenzyme kinetics.

13 L 4 A 7 = 41 or 14 A 3 L 12 = 54 rahe yo 12 L 3 A 9 =

equation of circle with(1,−2)(1,−2)and as(4,−3)(4,−3)diameter,

(x−1)(x−4)+y+2)(y+3)=0(1)(1)(x−1)(x−4)+y+2)(y+3)=0

Equation of line joining(1,−2)(1,−2)and as(4,−3)(4,−3)

(4–1)(y+2)−(−3+2)(x−1)=0⟹(4–1)(y+2)−(−3+2)(x−1)=0⟹

3y+x+5=0(2)(2)3y+x+5=0

equation of family of circles passing through the 2 points is

(x−1)(x−4)+(y+2)(y+3)−2K(3y+x+5)=0⟹(x−1)(x−4)+(y+2)(y+3)−2K(3y+x+5)=0⟹

x2+y2–2(K+52)x−2(3K−52)y+10–10K=0(3)(3)x2+y2–2(K+52)x−2(3K−52)y+10–10K=0

The center is(K+52,3K−52)(K+52,3K−52)

This should lie on3x+2y=7⟹3x+2y=7⟹

3(K+52)+2(3K−52)=7⟹2K=13(K+52)+2(3K−52)=7⟹2K=1

(3) now becomes

x2+y2–6x+2y+5=0x2+y2–6x+2y+5=0

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Theexchange energyis theenergyreleased when two or more electrons with the same spinexchangetheir positions in the degenerate orbitals of a subshell.

H2 is Hydrogen, a gas. When it combines with oxygen(O2), it becomes H2O (water). H2 is An Element whereas H2O is a Compound. H2 exists in gaseous state because of its extremely low melting point easily and H2O exists in all three states easily.