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Non-stoichiometric defect responsible for colour in alkali metal halide is metal excess (anion -vacancy) defect.

According to the molecular orbital theory, in a supposed He2 molecule, both the bonding and the antibonding orbitals will have 2 electrons each. And so, the bond order (half the difference in the numbers of bonding and antibonding electrons) for such a diatomic entity is zero. That means, the He2 molecule has no existence.so ans is c option

Q 32. (3) frenkel defectQ 33. (4)

thanku and plzz answer another question of mine of the lattice energy plzz

Electric field at a point near aninfinite thin sheet of charged conductor is σ/2ε₀

In order to find the electric field at a point P1 on an infinite thin plane charge sheet of positive charge another point P2 is taken on the other side of the sheet, so that P1 and P2 are equidistant from the sheet. Then a cylindrical Gaussian surface is constructed through the plane which extends equally on two sides of the plane. It is seen that the electric field isuniform and does not depend on the distance from the charge sheet.

In order to find the electric field at a point P which is near but outside the conductor. The Gaussian surface is constructed and it is seen that the electric field near a plane charged conductor is twice the electric field. This is in accordance with Coulomb's theorem which states that the electric field at any point very close to the surface of a charged conductor is equal to charge density of the surface divided by free space permittivity.

weight of 1 mol of C60H122 = 720 + 122 = 842g

and in 1 mol , 6×10²³ molecules are there so, weight of 1 molecule = 842/(6×10²³) = 140× 10-²³ = 1.4×10-²¹ g

Density is the measure of mass per volume. This means that density of any solid,liquid, or gas can be found by dividing its mass in kilogram by its volume in cubic metres.density=mass/volumethe unit for density is Kg metre cube

Relative density :

The ratio between density of a substance and density of water is called relative density.

Relative density =Density of the substance/density of water at 40C

option D 500

Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

where is video

Formula units per unit cell Z = 2 for BCC cubic unit cell lattice parameter a = 28 pm=288x10-8cmVolume V = a3=2.39X10-23cm3Density d = 7.2g/cm3N­A = Avogadro constant = 6.022x10²³Molecular mass M =?We know that Density d = ZM/NA Xa3,M = dxNA x a3/ZOn Substituting valuesM= 7.2g/cm3x(6.022x10²³)X (6.022x10²³)/2= 51.8gmol-151.8 g of element contains 6.022X1023208g of this element contains=?= 6.022X1023X208/51.8=2.42X1024atoms.

Balanced equation of Combustion of propane isC3H8 + 5O2 = 3CO2 + 4H2O

At NTP44g of propane requires 5*22.4L of oxygen for complete combustion22g of propane requires 22*5*22.4/44 = 56L

Volume of oxygen required for complete combustion is 56L

Number of atoms per unit cell, z = d × a³ × NA / M --> (1)

Here, d = 11.5 g cm⁻³ , M = 93 g mol⁻¹ , NA = 6.022 × 10²³ mol⁻¹

a = 300 pm = 300 × 10⁻¹⁰ cm = 3 × 10⁻⁸ cm

Now, Substituting these values in the expression (1), we get

z = 11.5 g cm⁻³ × (3 × 10⁻⁸ cm)³ × 6.022 × 10²³ mol⁻¹ / 93 g mol⁻¹

FINAL RESULT = 2.01

As there are 2 atoms of the element present unit cell, therefore, the cubic unit cell must be body centered

For an fcc solid, edge length ,a=2(r++r−)a=2(r++r−)

⇒2(110+r−)=508

⇒220+2r−=508

⇒2r−=508−220

⇒2r−=288

∴r−=144pm

15.93 × 10`8 cm is the answers

1-bromo 3-methyl butane

common name- isopentyl bromide

Mass/Charge of A+= (1.97x10^-7kg/charge)

Charge of an electron= 1.6 x 10^-19

Thus Mass of 'A' atom = (1.6 x 10^-19)(1.97x10^-7)= 3.16 x10^-26Kg

This isomerism is Ionisation Isomerism.

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Answer:1)1:1Explanation:Na2CO3 is thermally stable and does not decompose on ignition but CaCO3 decompse to give CO2.

CaCO3 → CaO + CO2

1mole i.e 100gm of CaCO3 gives 44 gm of CO2.

Wt.of CaCO3 giving 2.2 gm of CO2 =( 2.2X100/44)=5gm

Wt.of CaCO3 =5gm,

Wt.of Na2CO3=10-5=5gm,

There foe ratio of wts=1:1

the right answer is (1)1:1

Mixture analysis is a very active research topic in statistics and machine learning, with new developments in methodology .

Fullerenes may be used for drug delivery systems in the body, in lubricants and as catalysts. The tube fullerenes are callednanotubes.

in the adsorption of a gas on solid Freundlich isotherms is Obeyed the slope of the plot is zero then the extend of adsorptionis A.directly proportional to the pressure of thegas

Ammonia is used as a refrigerant gas, for purification of water supplies, and in the manufacture of plastics, explosives, textiles, pesticides,dyesand other chemicals. It is found in many household and industrial-strength cleaning solutions.

Ethanolisusedin medical wipes and most common antibacterial hand sanitizer gels as an antiseptic.Ethanol kills organisms by denaturing their proteins and dissolving their lipids and is effective against most bacteria and fungi, and many viruses.

How many iron atoms are present in a stainless steel ball bearing having a radius of 0.254 cm ?The stainless steel contains 85.6% Fe by weight and has a density of 7.75g/cm cube.

this is an answer to similar question.

H has 1 electron less than Nobel gas configuration so it shares it's electron with one more H to attain stability

but oxygen also have O2 why?

and other gases

When a base is dissolved in water then it will produce H⁺ ions as wells as OH⁻ ions. if H⁺ ion concentration is more than OH⁻ ion then the solution is acidic. And they show basic character if OH⁻ ion concentration is more than H⁺ ion concentration.That means they are basic due to presence of more OH- ions.

basic conditions required for an electric current to flow is a voltage source and resistance this resistance can be considered as a form of electric appliances just like a bulb or a heater Anything that have sort of resistance and after that there should be a switch for that the switch will work as the conditions of on and off if we switch off then no current would be flowing there and if we switch on the current will be flowing through the appliances

There is a relation b/w Normality and Molarity :

For acids.

Normality = Molarity xBasicity.

wherebasicityis the number ofH+ions a molecule of an acid can give.

Here, Normality is 0.4 and No. Of H+ ions in H2SO4 soln. is 2

Now, Put the values in to the formula,

Normality = Molarity xBasicity.

0.4 = molarity × 2 (no. Of H+ ions)

Molarity = O.4/2 =0.2 Moles per Litre

Answer:- Molarity of the mixture solution is 3.75M.

Solution:- Volume is an additive property so the volume of the mixture would be the sum of the volumes of two solutions of the acid being added together.

We could easily solve this problem using dilution equation:

M1V1 + M2V2 = MV

Where, M and V are the molarity and volume of the mixture.

Let's plug in the values in the equation:

3.0(25) + 4.0(75) = M(25+75)

75 + 300 = M(100)

375 = M(100)

M = 375/100

M = 3.75

So, the molarity of the mixture solution is 3.75M.

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Erich Huckel is a German chemist and physicist. He proposed a theory to determine the characteristics properties of the aromatic compound (containing at least one benzene ring) .

The rule states that if a cyclic, planer molecules containing (4n + 2 pi) electrons it has a aromatic properties. This rule is known as Huckel Rule.

Where, n = no. Of carbon atoms in compound pi = no. Of pi electrons